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All of the latest questions and illustrations on "Engine Room Steam Engines" are in the Online Study.

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Engine Room Steam Engines

 

B Precautions to be observed prior to starting a turbine driven cargo pump, should include __________. observing the operation of the over speed trip checking the manual trip device for proper operation assuring that the turbine casing drains are wired closed open all governor oil relay drains Auxiliary Turbines
A The slight wavy appearance of the tips of reduction gear teeth is a result of __________. the method of manufacture and does affect normal operation insufficient lube oil pressure uneven bearing wear due to gross misalignment high lube oil temperatures Drive Systems
D Which of the following types of bearings are used as line shaft bearings? Rigidly mounted, radial sleeve Segmental, pivoted-shoe thrust Tapered roller, split type radial Ring-oiled, Babbitt-faced, spherical seat, shell Drive Systems
D Which of the following methods is used to securely fasten the Babbitt lining of a reduction gear bearing to its shell? The Babbitt is securely bonded to the shell by the pressure of the hydrodynamic oil wedge. The Babbitt has a crescent shaped pocket cast symmetrically about the bearing split. The Babbitt is relieved in way of the split and held in place by locking pins. The Babbitt is centrifugally spun into the bearings or cast under a pressure head. Drive Systems
D Babbitt is a metal alloy commonly used for lining __________. saltwater piping valve seats shim stock precision bearings Drive Systems
D Which of the following construction methods would apply to the Babbitt lined, split-type, reduction gear bearings? They are secured in their housing so pressure points will occur at the joint faces. They are split into four equal sized segments. They are always mounted with the split in a horizontal plane. They are rigidly mounted and dowelled in their housings. Drive Systems
A The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist __________. wiping steam loss axial stress oil loss Drive Systems
D Chamfers, located at the parting edges of horizontal split sleeve type bearings, are used to facilitate oil storage and distribution. They are machined __________. radially the full length of the bearing radially, to within 45 degrees of the normal bearing surface axially the full length of the bearing axially, approaching but not extending to the end of the bearing Drive Systems
B Most main propulsion reduction gear bearings are __________. self-aligning, solid bushings rigidly mounted, Babbitt lined, split type spherical-seated, tapered roller type self-lubricating, sealed, roller ball type Drive Systems
D Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the reduction gear? Quill shaft Expansion gear Sliding sleeve Gear type flexible coupling Drive Systems
C Axial movement in a gear-type flexible coupling is provided for by __________. adjusting the pitch of the teeth on the pinion and high speed gears the variable oil clearance in the quill shaft gear teeth on the floating member sliding between internal teeth on the shaft ring each gear sliding on its shaft between retaining collars Drive Systems
D Which of the following statements is true concerning the coupling shown in the illustration? Illustration SE-0001 It is commonly used between the first reduction pinion and the second reduction gear. It is suitable for use on small auxiliary turbines only. It allows for any misalignment between the main turbine and the second reduction gear. It can be used to connect the main turbine to the high-speed pinion. Drive Systems
C Which of the coupling types listed is shown in the illustration? Illustration SE-0001 Claw Pin Gear Solid Drive Systems
B The part shown in the illustration would be located between which of the following components of a modern geared turbine main propulsion unit? Illustration SE-0001 Between the bull gear and line shaft on the side of the gear opposite the thrust bearing. Between the rotors and high-speed pinions of the high pressure and low pressure turbines. Between the bull gear and line shaft on the thrust bearing side of the gear. Between the first reduction gears and high-speed pinions of the high pressure and low pressure turbines. Drive Systems
C On main turbine propulsion units, gear type flexible couplings are generally used between the __________. quill shaft and high speed pinion second reduction and the shaft thrust bearing rotor shaft and pinion shaft rotor shaft and quill shaft Drive Systems
B The component shown in the illustration, labeled "I", is the __________. Illustration SE-0013 first reduction pinion first reduction gear second reduction pinion second reduction gear Drive Systems
D A ship is equipped with the illustrated turbine gear set and a right hand turning propeller. When steam is admitted to the astern element, with sternway on, the high-speed gear on the high pressure side is__________. Illustration SE-0016 turning counter clockwise as viewed from the aft end of the reduction gear. turning opposite to the rotation of the high-speed gear on the low pressure side. turning the same rotation of the high-speed pinion on the low pressure side. rotating the same direction as the low-speed pinion on the low pressure side. Drive Systems
C The purpose of the main reduction gears is to __________. reduce engine room noise levels during high speed operations transmit vibration and thrust to the ship's hull reduce high turbine RPM to an efficient propeller RPM provide a means of reversing the main engines in an emergency Drive Systems
A The component shown in the illustration, labeled "IV", is the __________. Illustration SE-0013 bull gear high speed pinion first reduction gear low speed pinion Drive Systems
A What is the significance of pinion deflection in the operation of reduction gears? Pinion deflection causes unequal tooth loading. Deflection is minimal because a longer pinion is more rigid. Deflection causes excessive wear at the center of the pinion. Deflection causes excessive wear at both ends of the pinion. Drive Systems
D After the housing has been bolted down, the final check of reduction gear tooth contact is usually made by __________. dial indicators alignment gauges bridge gauges bluing the teeth Drive Systems
B The component labeled "II", as shown in the illustration, is called the __________. Illustration SE-0013 first reduction gear high speed pinion second reduction pinion second reduction gear Drive Systems
C The component shown in the illustration, labeled "III", is the __________. Illustration SE-0013 first reduction gear second reduction gear low speed pinion high speed pinion Drive Systems
D The reduction gear shown in the illustration is a/an __________. Illustration SE-0013 locked-train double reduction gear nested four-step reduction gear nested double reduction gear articulated double reduction gear Drive Systems
D Which of the following statements defines the term 'axial float' in reference to reduction gears? The gears are capable of free motion, neither supporting nor being supported radially by other gears. The gears cut with a single helical profile have axial thrust eliminated. The gears are not subject to excessive tooth loads due to mismatching of the journal bearing halves. A pinion is capable of free axial motion, mating with a fixed double helical gear which establishes its position in the gear train. Drive Systems
C As found in a reduction gear drive system, thrust bearings serve to __________. increase the shaft speed limit the radial movement of the shaft transmit the force produced by the propeller to the structure of the ship hold the main engine in place Drive Systems
B In the thrust bearing assembly illustrated the total oil clearance can be correctly decreased by __________. Illustration SE-0007 increasing the thickness of the filler piece decreasing the thickness of the adjusting ring decreasing the thickness of the filler piece increasing the thickness of the adjusting ring Drive Systems
C In the diagrammatic arrangement of the thrust bearing, shown in the illustration, the direction of shaft rotation and the direction of thrust are indicated respectively by arrows __________. Illustration SE-0012 F and H G and J F and J G and H Drive Systems
A The base ring shown in the illustration is identified by the letter __________. Illustration SE-0012 D E C A Drive Systems
D A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing __________. for automatically adjusting clearances to the correct value when wear occurs for adjusting the filler piece thickness behind the pivotal-shoes to give a more accurate fit to allow the leveling plates to pivot on the collar when thrust loads are applied for the shoes to tilt slightly, thereby allowing the formation of a wedge shaped oil film under a thrust load Drive Systems
B Which of the statements listed applies to the quill shaft shown in the illustration? Illustration SE-0005 It absorbs the axial thrust generated by the meshing gears. It permits axial movement between the high speed gear and low speed pinion. It compensates for high speed pinion radial misalignment. It provides torsional rigidity to help maintain alignment between gear train and the turbine rotor. Drive Systems
A Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing? After the main unit is secured, lubricating oil should be circulated until the temperature of the oil and reduction gear casing approximates the engine room temperature. Always ensure that the lubricating oil pressure is 14-17 psi when operating in unusually cold waters. Avoid applying gland sealing steam to the low pressure turbine until you are ready to start up the first-stage air ejector. The temperature of the lubricating oil should not exceed the gear manufacturer's recommendation when the unit is operating at full load. Drive Systems
B The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________. perform a carbon blot test on an oil sample from the bearing check the lube oil temperature check the lube oil viscosity visually inspect the bearing Drive Systems
D Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears? Check radial bearing wear. Inspect alignment between gears and turbine. Check teeth for pitting and scuffing. Check bearing lube oil temperatures. Drive Systems
A Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature? Check the bearing for proper lubrication. Stop the unit and replace the bearing. Check for proper water circulation to the lube oil coolers. Stop the unit and carefully inspect the bearing. Drive Systems
C The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________. perform a carbon blot test on an oil sample from the bearing check the lube oil viscosity check the lube oil temperature visually inspect the bearing Drive Systems
D Which of the following would cause the dowel or locking lip of a split-type, precision insert, main bearing to shear and allow the bearing to rotate with the journal? Short periods of above normal operating speeds Excessive bearing bolt torque Unequal torque to any two adjacent bearing bolts Insufficient bearing crush Drive Systems
A If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then __________. apply emergency cooling water externally to the bearing decrease lube oil pressure to the bearing increase lube oil pressure to the bearing flood the bearing with a higher viscosity oil to provide emergency lubrication and cooling Drive Systems
A While a vessel is underway the low pressure turbine high-speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction? Reduced speed ahead only Reduced speed astern and full speed ahead Reduced speed astern only Reduced speed ahead and full speed astern Drive Systems
A What is the FIRST thing that will happen if both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed? Ahead throttle will close. Lube oil sump will overflow. HP turbine bearings will overheat. Vacuum will be lost. Drive Systems
C Which of the following types of bearings are used as line shaft bearings? tapered roller, split type radial Rigidly mounted, radial sleeve Ring-oiled, Babbitt-faced, spherical seat, shell Segmental, pivoted-shoe thrust Drive Systems
A Babbitt is a metal alloy commonly used for lining __________. precision bearings saltwater piping valve seats shim stock Drive Systems
A The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist __________. wiping steam loss oil loss axial stress Drive Systems
B Most main propulsion reduction gear bearings are __________. self-aligning, solid bushings rigidly mounted, Babbitt lined, split type spherical-seated, tapered roller type self-lubricating, sealed, roller ball type Drive Systems
B Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the reduction gear? Expansion gear Gear type flexible coupling Quill shaft Sliding sleeve Drive Systems
A Which of the following statements is true concerning the coupling shown in the illustration? Illustration SE-0001 It can be used to connect the main turbine to the high-speed pinion. It is commonly used between the first reduction pinion and the second reduction gear. It is suitable for use on small auxiliary turbines only. It allows for any misalignment between the main turbine and the second reduction gear. Drive Systems
D The part shown in the illustration would be located between which of the following components of a modern geared turbine main propulsion unit? Illustration SE-0001 Between the bull gear and line shaft on the thrust bearing side of the gear. Between the first reduction gears and high-speed pinions of the high pressure and low pressure turbines. Between the bull gear and line shaft on the side of the gear opposite the thrust bearing. Between the rotors and high-speed pinions of the high pressure and low pressure turbines. Drive Systems
C The purpose of the main reduction gears is to __________. provide a means of reversing the main engines in an emergency transmit vibration and thrust to the ship's hull reduce high turbine RPM to an efficient propeller RPM reduce engine room noise levels during high speed operations Drive Systems
A What is the significance of pinion deflection in the operation of reduction gears? Pinion deflection causes unequal tooth loading. Deflection is minimal because a longer pinion is more rigid. Deflection causes excessive wear at the center of the pinion. Deflection causes excessive wear at both ends of the pinion. Drive Systems
D The component labeled "II", as shown in the illustration, is called the __________. Illustration SE-0013 first reduction gear second reduction pinion second reduction gear high speed pinion Drive Systems
B The reduction gear shown in the illustration is a/an __________. Illustration SE-0013 locked-train double reduction gear articulated double reduction gear nested double reduction gear nested four-step reduction gear Drive Systems
A Regarding main reduction gears, when high speed first reduction pinions and gears are connected to low speed pinions and gears, each contained in a sequential portion of the gear housing, the reduction gear unit is known as __________. articulated locked train nested none of the above Drive Systems
A As found in a reduction gear drive system, thrust bearings serve to __________. transmit the force produced by the propeller to the structure of the ship hold the main engine in place increase the shaft speed limit the radial movement of the shaft Drive Systems
A In the thrust bearing assembly illustrated the total oil clearance can be correctly decreased by __________. Illustration SE-0007 decreasing the thickness of the adjusting ring increasing the thickness of the adjusting ring increasing the thickness of the filler piece decreasing the thickness of the filler piece Drive Systems
B In the diagrammatic arrangement of the thrust bearing, shown in the illustration, the direction of shaft rotation and the direction of thrust are indicated respectively by arrows __________. Illustration SE-0012 G and J F and J F and H G and H Drive Systems
B The base ring shown in the illustration is identified by the letter __________. Illustration SE-0012 E D A C Drive Systems
C A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing __________. to allow the leveling plates to pivot on the collar when thrust loads are applied  for adjusting the filler piece thickness behind the pivotal-shoes to give a more accurate fit for the shoes to tilt slightly, thereby allowing the formation of a wedge shaped oil film under a thrust load for automatically adjusting clearances to the correct value when wear occurs Drive Systems
C Which of the statements listed applies to the quill shaft shown in the illustration? Illustration SE-0005 It provides torsional rigidity to help maintain alignment between gear train and the turbine rotor. It absorbs the axial thrust generated by the meshing gears. It permits axial movement between the high speed gear and low speed pinion. It compensates for high speed pinion radial misalignment. Drive Systems
B Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing?
The temperature of the lubricating oil should not exceed the gear manufacturer's recommendation when the unit is operating at full load. After the main unit is secured, lubricating oil should be circulated until the temperature of the oil and reduction gear casing approximates the engine room temperature. Avoid applying gland sealing steam to the low pressure turbine until you are ready to start up the first-stage air ejector. Always ensure that the lubricating oil pressure is 14-17 psi when operating in unusually cold waters. Drive Systems
B The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________.
(a) visually inspect the bearing check the lube oil temperature check the lube oil viscosity perform a carbon blot test on an oil sample from the bearing Drive Systems
B Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears?
Check radial bearing wear. Check bearing lube oil temperatures. Inspect alignment between gears and turbine. Check teeth for pitting and scuffing. Drive Systems
B Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature? Stop the unit and replace the bearing. Check the bearing for proper lubrication. Stop the unit and carefully inspect the bearing. Check for proper water circulation to the lube oil coolers. Drive Systems
B The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________. perform a carbon blot test on an oil sample from the bearing check the lube oil temperature check the lube oil viscosity visually inspect the bearing Drive Systems
C Which of the following would cause the dowel or locking lip of a split-type, precision insert, main bearing to shear and allow the bearing to rotate with the journal? Unequal torque to any two adjacent bearing bolts Short periods of above normal operating speeds Insufficient bearing crush Excessive bearing bolt torque Drive Systems
A If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then __________. apply emergency cooling water externally to the bearing increase lube oil pressure to the bearing flood the bearing with a higher viscosity oil to provide emergency lubrication and cooling decrease lube oil pressure to the bearing Drive Systems
A Most auxiliary turbines do not require an external source of gland sealing steam because they __________. exhaust to pressures above atmospheric pressure operate at relatively low pressures operate with only a small amount of axial thrust utilize carbon packing rings at the low pressure end Governing And Control Systems
A Turbine throttling losses can best be described as a loss of energy occurring __________. as steam passes through the steam admission valve and there is a drop in pressure without the performance of work whenever there is leakage of steam from one stage to another through the throttle valve packing gland as a result of friction created when steam passes through the nozzle block as a result of fluid friction caused by frequently throttling the turbine wheel and blade speed Governing And Control Systems
C An excess pressure governor is a special type of control device which would normally be found on a __________. forced draft fan main circulator pump turbine-driven feed pump low pressure propulsion turbine Governing And Control Systems
B The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. hydraulic pressure centrifugal force pneumatic force high back pressure Governing And Control Systems
D Carbon ring packing segments are secured in a shaft gland assembly of a steam turbine by means of __________. centering rings labyrinth rings steam pressure garter springs Governing And Control Systems
C Packing rings installed on auxiliary turbines are generally lubricated by __________. separate lube oil lines a water leak off line moisture in the turbine steam a salt water service line Governing And Control Systems
A Which type of packing is primarily utilized to control steam leakage from the casing of a modern auxiliary turbine? labyrinth Teflon dovetail carbon Governing And Control Systems
C When fitting new carbon ring packing on a turbine rotor shaft, carefully filing the ends of the segments will __________. provide for a greater oil wedge pressure reduce the ring segment end clearance reduce the clearance between the assembled ring segments and shaft reduce the possibility of scoring the shaft Governing And Control Systems
B To test an automatic low lube oil pressure trip on an idling turbo generator and at the same time prevent the chance of bearing damage, you should __________. actuate the over speed trip, making a note at what pressure the oil is dumped from under the operating piston secure the steam supply valve to the throttle valve and observe the oil pressure as the throttle trips during the slowdown and ensure a supply of oil with the hand or standby pump when the pressure drops to 2-3 psi ensure the standby lube oil pump, if so equipped, is properly lined up and set in the 'auto' mode, or the hand pump is being operated and then actuate the emergency trip close the generator steam throttle valve and then ensure a supply of oil through the hand or standby pump when the pressure drops to 5-6 psi Governing And Control Systems
A The turbine of a turbo-electric drive should be secured by __________. tripping the throttle trip by hand dynamic braking of the generator closing the main steam stops closing the throttle by hand Governing And Control Systems
C An auxiliary turbine boiler feed pump should normally be stopped by __________. increasing the load on the driven unit closing the exhaust valve slightly actuating the throttle hand tripping device rotating the hand lube oil pump backwards Governing And Control Systems
A A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed __________. 1380 RPM 1440 RPM 1320 RPM 1500 RPM Governing And Control Systems
C In any governor there is a small range of speed in which no corrective action occurs. This speed range is called the governor dead band and is caused by __________. excessive sensitivity in the governor control valve speed droop designed into the governor system friction in the governor linkage and control valve speeder spring surge in the governor servomotor system Governing And Control Systems
D Rotating flyweights, acting against a spring force, will provide a simple type of __________. reducing valve safety valve feed water regulator governor Governing And Control Systems
A A constant speed hydraulic governor would more than likely be installed on a __________. turbo generator main condensate pump main propulsion turbine main feed pump Governing And Control Systems
B Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve? Excessive centrifugal force causes spring loaded fly balls to actuate a control lever. Excessive speed causes an oil pump to develop sufficient pressure to open a spring loaded relay valve which tends to close the steam control valve. Excessive speed causes an increase in lube oil control temperature which actuates a solenoid oil dump valve. Excessive centrifugal force causes a spring loaded weight to trip a valve latch. Governing And Control Systems
A When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of __________. the hand operated or auxiliary lube oil pump a line from the gravity tank the main lube oil pump a line from the other generator Governing And Control Systems
D Which of the listed parts illustrated in the turbo generator governing system, provides the follow-up to prevent the nozzle valves from cycling between the fully open and fully closed positions, with each variation in turbine speed? Illustration SE-0009 O D H E Governing And Control Systems
D If two turbo-generators with the same no-load speed settings are operating in parallel, the unit whose governor has the lesser speed droop will __________. have poor power response have poor sensitivity characteristics assume the smaller share of the load assume the larger share of the load Governing And Control Systems
B Which of the listed actions will occur when there is an increase in load on a ship service generator equipped with a centrifugal type hydraulic governor? Illustration SE-0009 Steam flow to the turbine decreases. More oil will enter the operating cylinder (O). The governor weights move outward. The operating piston is forced to move lower. Governing And Control Systems
B A pilot valve and servomotor are utilized in mechanical-hydraulic governing systems on a turbo generator unit in order to __________. constant load on the turbine unit provide sufficient force to operate large steam lifting beam control valves allow parallel operation with zero speed droop provide a means of maintaining constant output voltage Governing And Control Systems
D A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance? lubricating oil pressure is too low gland seal leak off pressure is too high amount of cooling water to the condenser is excessive amount of cooling water to the condenser is insufficient Governing And Control Systems
B The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. hydraulic pressure centrifugal force high back pressure pneumatic force Governing And Control Systems
A An excess pressure governor would normally be used on a __________. turbine-driven feed pump low pressure propulsion turbine forced draft fan main circulator pump Governing And Control Systems
A The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities? Pump discharge Pump suction Turbine inlet Turbine exhaust Governing And Control Systems
B In addition to causing erosion of turbine blades, slugs of water in the steam supply to a turbine driven pump can result in __________. loss of load with resultant turbine over speed erratic governor operation thermal shock to the bearings overheating of the wearing rings Governing And Control Systems
C A turbo generator back pressure trip can be actuated as a result of __________. an excessive pressure drop through the turbine a steam inlet valve being partially open insufficient circulating water flow through the condenser excessively low exhaust pressure Governing And Control Systems
A The main throttle valve on a main propulsion turbine admits steam directly into the __________. turbine steam chest nozzle diaphragm turbine blades crossover connection Governing And Control Systems
B In the illustration of a typical ship service turbo-generator control system, the handle labeled "B" is used to____________. Illustration SE-0009 pump up the lube oil manifold reset the over speed trip bypass the governor control roll over the high speed pinion Governing And Control Systems
C Which of the following statements concerning the design of balanced throttle valves is correct? The ahead throttle valve normally utilizes a guarding valve. Both ahead and astern valves normally have a positive opening tendency. They commonly use a conventional valve disc and a balance piston. They commonly use two parallel seats and a balance cylinder. Governing And Control Systems
B A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles? A servomotor, mechanically connected to nozzle valve hand wheels, opens or closes the

valves in accordance with the type of electrical signal received.
A lifting beam mechanism engages nozzle valve stems of varying lengths. A hydraulic piston raises or lowers individual valves according to pressure received from a governor. A hydraulic piston raises or lowers groups of valves according to pressure received from a governor. Governing And Control Systems
C Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism? The pressure differential eliminates the possibility of valve binding in the lifting beam.
 
o
The pressure differential requires the installation of a special biasing spring to open the

valves.
The pressure differential assists in seating the valves when the lifting beam is lowered. The pressure differential necessitates the use of a special balance piston. Governing And Control Systems
D Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator? Oil pressure Springs Lifting beam Steam pressure Governing And Control Systems
B A motor driven synchronizing device, figure "D" shown in the illustration, operated from the generator switchboard, initiates fine adjustments to the steam turbine speed by directly __________. Illustration SE-0009 raising or lowering the nozzle block lifting beam changing the vertical location of the pilot valve bushing increasing or decreasing operating spring pressure varying the pivot rod stroke length on the governor weight eccentric pad Governing And Control Systems
C Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve? Excessive centrifugal force causes spring loaded fly balls to actuate a control lever.  Excessive speed causes an increase in lube oil control temperature which actuates a solenoid oil dump valve. Excessive speed causes an oil pump to develop sufficient pressure to open a spring loaded relay valve which tends to close the steam control valve. Excessive centrifugal force causes a spring loaded weight to trip a valve latch. Governing And Control Systems
C When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of __________. a line from the other generator a line from the gravity tank the hand operated or auxiliary lube oil pump the main lube oil pump Governing And Control Systems
B A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance? amount of cooling water to the condenser is excessive amount of cooling water to the condenser is insufficient lubricating oil pressure is too low gland seal leak off pressure is too high Governing And Control Systems
D A pilot valve and servomotor are utilized in mechanical-hydraulic governing systems on a turbo generator unit in order to __________. provide a means of maintaining constant output voltage allow parallel operation with zero speed droop constant load on the turbine unit provide sufficient force to operate large steam lifting beam control valves Governing And Control Systems
C Which of the listed parts illustrated in the turbo generator governing system, provides the follow-up to prevent the nozzle valves from cycling between the fully open and fully closed positions, with each variation in turbine speed? Illustration SE-0009 H O E D Governing And Control Systems
B Which of the listed actions will occur when there is an increase in load on a ship service generator equipped with a centrifugal type hydraulic governor? Illustration SE-0009 The governor weights move outward. More oil will enter the operating cylinder (O). Steam flow to the turbine decreases. The operating piston is forced to move lower. Governing And Control Systems
A The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. centrifugal force pneumatic force high back pressure hydraulic pressure Governing And Control Systems
B An excess pressure governor would normally be used on a __________. low pressure propulsion turbine turbine-driven feed pump forced draft fan main circulator pump Governing And Control Systems
A The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities? Pump discharge Turbine inlet Turbine exhaust Pump suction Governing And Control Systems
A A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles? A lifting beam mechanism engages nozzle valve stems of varying lengths. A servomotor, mechanically connected to nozzle valve hand wheels, opens or closes the valves in accordance with the type of electrical signal received. A hydraulic piston raises or lowers groups of valves according to pressure received from a governor. A hydraulic piston raises or lowers individual valves according to pressure received from a governor. Governing And Control Systems
C Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism? The pressure differential necessitates the use of a special balance piston.
 
o
The pressure differential requires the installation of a special biasing spring to open the

valves.
The pressure differential assists in seating the valves when the lifting beam is lowered. The pressure differential eliminates the possibility of valve binding in the lifting beam. Governing And Control Systems
B Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator? Springs Steam pressure Lifting beam Oil pressure Governing And Control Systems
C A motor driven synchronizing device, figure "D" shown in the illustration, operated from the generator switchboard, initiates fine adjustments to the steam turbine speed by directly __________. Illustration SE-0009 varying the pivot rod stroke length on the governor weight eccentric pad increasing or decreasing operating spring pressure changing the vertical location of the pilot valve bushing raising or lowering the nozzle block lifting beam Governing And Control Systems
D The maximum temperature rise of oil passing through any reduction gear set, or bearing, should not exceed __________. 90F (44.5C) 30F (16.7C) 70F (38.9C) 50F (27.8C) Lubrication Systems
C A common method of preheating main turbine lube oil prior to rolling over the main unit would be to __________. bypass the lube oil gravity tank run both the lube oil pumps simultaneously operate the lube oil purifier on the main lube oil sump slightly increase gland sealing steam pressure Lubrication Systems
C Which of the following types of bearing lubrication schemes can carry the highest unit loading? Ring lubricated Disk lubricated Pressure lubricated Oil whip lubricated Lubrication Systems
D As lube oil absorbs moisture its dielectric strength can be expected to __________. increase with a decrease in viscosity increase with an increase in viscosity remain the same decrease Lubrication Systems
B When the temperature of the main turbine lubricating oil is lowered, an increase will occur in the __________. pour point viscosity flash point concentration of contaminants Lubrication Systems
A In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct? The cooling water discharge leaving the cooler is directly regulated. The quantity of lube oil to the cooler is regulated. The cooling water to the lube oil cooler is directly regulated to maintain the proper lube oil temperature. The lube oil velocity from the cooler is regulated. Lubrication Systems
C In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the __________. gravity feed tank main thrust bearing lube oil coolers lube oil header Lubrication Systems
B To assure the main propulsion turbine bearings are receiving the proper lube oil supply, you should check the __________. lube oil strainer magnets flow through the sight glass at the bearing bull's-eye in the gravity tank overflow lube oil temperature at the cooler outlet Lubrication Systems
D The term 'separation' as used in oil purification refers to the removal of __________. oil from its additives solids from lube oil acid contaminants from oil water from a mixture of oil liquids Lubrication Systems
C If contaminated lube oil were allowed to settle undisturbed in a tank, into which layers would the contaminants separate? Sediment on the bottom, oil in the middle, and water on top. Water on the bottom, oil in the middle, and sediment on top. Sediment on the bottom, water in the middle, and oil on top. Water on the bottom, sediment in the middle, and oil on top. Lubrication Systems
B Lube oil cannot be efficiently filtered if it's __________. pump capacity is greater than the system's needs temperature is too low viscosity index is too low pump discharge pressure is higher than the system pressure Lubrication Systems
D According to the illustration, what is the normal function of the component shown? Illustration SE-0010 indicate the pressure and temperature of lube oil leaving a turbine bearing indicate the pressure and flow of lube oil entering a turbine bearing act as a final filter for oil entering a bearing indicate the temperature and flow of lube oil leaving a turbine bearing Lubrication Systems
D Which of the following conditions is indicated by oil flowing through a lube oil gravity tank overflow sight glass? Turbine bearing failure has occurred. Insufficient oil is being pumped to the gravity tank. Excessive oil is stored in the gravity tank. Sufficient oil flow is being supplied to the gravity tank. Lubrication Systems
B The gravity tank in a gravity lube oil system serves to __________. settle lube oil prior to purifying maintain oil supply for several minutes to bearings should the lube oil service pump fail store heated lube oil supply the lube oil service pump with a positive suction head Lubrication Systems
B During high speed operation of the main turbine propulsion unit, the heat absorbed by the lubricating oil is removed by the __________. distillate cooler lube oil cooler lube oil purifier sump vents Lubrication Systems
B What type of lube oil cooler is shown in the illustration? Illustration GS-0122 Plate type Shell-and-tube Bundle and stack Self venting Lubrication Systems
A Which of the following statements is true concerning lube oil coolers? The pressure of the oil is greater than that of the cooling water. Magnets are installed in the tube sheets to remove metal particles. The pressure of the oil is less than that of the cooling water. The temperature of the oil is less than that of the cooling water. Lubrication Systems
D If the main and standby lube oil service pumps of the main engine fail while underway at sea, __________. the turbine bearings will immediately fail emergency lubrication can be supplied through the use of the hand pump the reduction gear bearings will immediately fail an emergency supply of oil in the gravity tank will provide time to crash stop the turbine and gears Lubrication Systems
D In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the __________. main thrust bearing gravity feed tank lube oil header lube oil coolers Lubrication Systems
B Magnets are installed in the main propulsion turbine lube oil strainers to attract metal particles released through wearing of the __________. Babbitt bearings reduction gears turbine blades turbine labyrinth Lubrication Systems
B As the speed of an oil lubricated ball bearing increases, fluid friction, due to churning, generates heat. This condition may be avoided by __________. adding more lubricant until the ball bearings are completely covered with a layer of oil reducing the quantity of lubricant until only a mist of oil is present on the ball bearings maintaining a continuous fluid level over half of the outer race installing oil rings on the ball bearings Lubrication Systems
D Which of the filters listed will deplete the additives in lubricating oil? Extended area membrane filter Cloth bag extractor Absorbent filter Adsorbent filter Lubrication Systems
B Turbine lube oil suction strainer baskets have __________. frame lined with wire cloth coarse perforations fine perforations self-cleaning design Lubrication Systems
B One limiting problem of lube oil filters restricting their use in large lube oil systems is __________. as the oil temperature fluctuates during load changes their effectiveness changes inversely to

the temperature
the associated large pressure drop across the filter they easily rupture at normal working pressures the need to centrifuge the oil in addition to the use of the filter Lubrication Systems
D Fine metallic particles, which may originate from wear or failure of the lube oil service pump internal parts, are prevented from contaminating the bearings served by the lube oil system by __________. the change of direction and settling action within the lube oil coolers batch centrifuging the lube oil at least once a week the settling action of solid matter in the gravity tank use of the magnetic strainers in the lube oil service pump discharge piping Lubrication Systems
A Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures? Diesel fuel oil Metal particles Water Carbon particles Lubrication Systems
C In order to obtain the best performance with a lube oil purifier, the lube oil inlet temperature should __________. be equal to the normal lube oil cooler outlet temperature never exceed the highest main engine bearing temperature be maintained in a temperature range of 160F to a maximum of 180F be equal to main lube oil sump temperature Lubrication Systems
A In the operation of a lube oil clarifier, the position of the oil-water interface should be __________. non-existent maintained by the number of disks in the disk stack maintained by the ring dam maintained by the diaphragm-type, weir control valve Lubrication Systems
B Which of the following statements concerning the operation of a lube oil purifier is correct? They should be operated as slowly as possible to ensure a long service life. They should be operated at maximum design speed and recommended operating capacity. They should not be primed with water when operated as a separator. They should be operated as clarifiers for optimum moisture removal. Lubrication Systems
C A centrifuge will satisfactorily remove which of the listed substances from lube oil? Fuel oil Diesel fuel Carbon particles Gasoline Lubrication Systems
B The water seal in a centrifuge, operating at normal speed, prevents the lube oil from discharging from the water outlet. Another function of the seal is to __________. provide a means of 'washing' the oil as it passes through the bowl provide an area for separated water to pass and create a path to remove the water from the bowl develop permanent emulsions with the lube oil keep the bowl at a temperature below that of the lube oil input Lubrication Systems
C In order to maintain the effectiveness of the lube oil centrifuge to remove water, the engineer in charge should __________. have the centrifuge cleaned only once every 30 days maintain the lube oil input temperature at a maximum of 110F take lube oil samples each week and place in clear containers for inspection insure that the oil input is always twice the output capacity Lubrication Systems
C When water is removed from lube oil passing through a centrifugal purifier, the water removed will __________. be retained in the bowl force the diameter of the oil column within the bowl to be narrowed displace an equal amount of water from the bowl seal displace water from the heavy phase discharge port, but of an amount less than that removed from the oil Lubrication Systems
A One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to __________. minimize agitation of the oil-water mixture increase hydraulic head needed for proper circulation completely filter out suspended particles prevent bowl spindle vibration Lubrication Systems
D The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the __________. viscosity of the oil being purified rated capacity of that purifier maximum design speed of that purifier specific gravity of the oil being purified Lubrication Systems
A The disk stack and tubular shaft used in a lube oil centrifugal purifier, is forced to rotate at bowl speed by __________. the locating pin wire springs the drive pin the use of an acme thread screw Lubrication Systems
C In a disk type centrifugal purifier, the contaminated oil enters the centrifuge __________. through the neck of the top disk through the funnel body at the top through the regulating tube at the bottom through the oil inlet Lubrication Systems
B In a disk-type lubricating oil purifier, __________. all dirt and sludge are automatically discharged with the cooling water deterioration of the bowl ring gasket will cause the purifier to lose its water seal the purifier driving gears are lubricated by the reclaimed oil as it leaves the bowl sealing water must never be supplied until after oil is fed to the unit Lubrication Systems
C Item "Q" in the illustration is used to __________. Illustration GS-0124 balance the force distribution of the three wing device guide the oil to be cleaned along the inside of the bowl for discharge establish the position of the three wing within the bowl assist in breaking down surface tension and thereby increase separation of solids and liquids from the oil Lubrication Systems
B Clean oil leaves the centrifuge illustrated through item __________. Illustration GS-0124 N X V K Lubrication Systems
D The rotating speed of the tubular bowl centrifuge is more than twice that of the disk type. The reason for this is __________. the friction affecting rotation is not as significant with a narrow diameter bowl a narrow diameter bowl is not effected as much by windage losses as a larger diameter bowl the drag bushing is used to permit the higher speed of rotation to produce a nearly equal magnitude of centrifugal force Lubrication Systems
A Water removed through centrifugal force in the illustrated unit is displaced from the bowl through __________. Illustration GS-0124 N K X V Lubrication Systems
A The three wing device in the unit illustrated is maintained in its position by item __________. Illustration GS-0124 Q O P R Lubrication Systems
C Oil supply pressure to the main lube oil header of a gravity feed lube oil system is __________. the sum of the lube oil static head pressure and service pump discharge pressure the difference between the lube oil static head pressure and service pump discharge pressure the result of the height of the gravity tank above the manifold equal to the service pump discharge pressure, since the static heads of the lines to and from the gravity tank cancel out one another Lubrication Systems
B Oil flowing through the sight glass in the line between the lube oil gravity tank and main sump indicates the __________. lube oil pump is stopped gravity tank is overflowing lube oil suction strainer is clogged lube oil sump is full Lubrication Systems
D Which of the following statements is true concerning the lube oil system shown in the illustration? Illustration SE-0011 The gravity tank directly provides the normal supply of oil to the turbines and gears. The gravity tank overflow line leads directly to the lube oil sludge tank. The three-way temperature control valve bypasses cooling water around or through the lubricating oil cooler to maintain the desired oil temperature. The drains from lube oil coolers can be directed back to the main sump, the sludge tank or the lube oil purifier. Lubrication Systems
B In a gravity lube oil system, a sight glass is installed in a line near the operating platform. This line connects the __________. bottom of the gravity tank and the lube oil headers gravity tank overflow and the sump gravity tank overflow and the lube oil headers bottom of the gravity tank and the sump Lubrication Systems
C Which of the following statements about gravity type lube oil systems is correct? Gravity tanks are fitted with an overflow alarm. Any lube oil pump failure causes immediate damage to turbine bearings. Gravity tank overflow lines are lead directly to the lube oil sump. The discharge from the gravity tanks flows to the lube oil pump suction. Lubrication Systems
A On a ship equipped with a gravity type lube oil system, which of the conditions listed will occur FIRST if the main lube oil pump discharge pressure is lost? An alarm will sound. The astern throttle will immediately open. Lube oil will be provided to the bearings and gears via the gravity tank overflow line. All bearing oil pressure will be lost. Lubrication Systems
C After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by __________. sounding the lube oil sump sounding the gravity tanks observing the overflow sight glass observing the flow from the bearings Lubrication Systems
A In steam turbine and reduction gear units, lube oil coolers installed in the lube oil system are located between the __________. lube oil pumps and gravity tanks lube oil sump and lube oil pumps gravity tanks and lube oil sump gravity tanks and main unit Lubrication Systems
D In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed __________. at a point on the inlet side of the main bearings as close to the bearings as possible at a point on the outlet side of the main bearings as close to the bearings as possible at the outlet of the main thrust bearing at the end of the supply line header to the bearings Lubrication Systems
A Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________. causes pitting of the gear teeth raises the flash point of the oil to a dangerously high level causes the turbine to over speed results in excessive cooling of bearing surfaces Lubrication Systems
D Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation? Aeration, agitation, and heat Solid insoluble particles, aeration, and heat Water and solid insoluble particles Water, agitation, and heat Lubrication Systems
C If a lube oil pump fails to build up discharge pressure, the cause could be the __________. bypass valve is closed discharge valve is open suction valve is closed suction vacuum is high Lubrication Systems
A When the flow of oil admitted to a disk-type centrifugal purifier is in excess of its designed capacity, which of the following conditions will usually occur? The oil will discharged through the heavy phase discharge port. The speed of the centrifuge will increase. All water will be retained by the purified oil being discharge. Oil will be present in the water sealing line to the bowl. Lubrication Systems
B While a vessel is underway, which of the conditions listed would indicate a leak in the lube oil cooler? Contamination of the lube oil. Excessive lube oil consumption. Corrosion of the journals and bearings. Excessive water discharge rate from the lube oil purifier. Lubrication Systems
C Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet? Turbine shrouding damage. Main shaft bearing damage. Reduction gear damage. Journal bearing damage. Lubrication Systems
C The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.
be always maintained at 130 F not exceed the normal lube oil outlet temperature from the centrifugal purifier never exceed 170F never exceed the inlet temperature by more than 70F Lubrication Systems
D A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by __________. insufficient cooling water to the lube oil cooler insufficient gland sealing steam excessive cooling water to the lube oil cooler excessive gland sealing steam Lubrication Systems
A Which of the following problems will occur if a manually cleaned disk-type centrifugal lube oil purifier contains insufficient sealing water prior to admitting oil flow to the bowl? Lube oil will discharge from the heavy phase discharge port to the sludge tank. The lube oil will not be subjected to the proper centrifugal force. Contamination of the lube oil by emulsification will result. The lube oil will overheat and flash. Lubrication Systems
C If saltwater leaks into and contaminates the main lubricating oil system, which of the following remedial actions should be taken? Run the engines at idle and prevent the circulation of contaminated oil. Disengage the jacking gear and allow contaminated oil to cool to engine room temperature. Seal off the leak and promptly remove and replace all contaminated oil from the system. Locate the leak and seal it off when time permits. Lubrication Systems
B What is the FIRST thing that will happen if both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed? Vacuum will be lost. Ahead throttle will close. Lube oil sump will overflow. HP turbine bearings will overheat. Lubrication Systems
D One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to __________. increase hydraulic head needed for proper circulation completely filter out suspended particles prevent bowl spindle vibration minimize agitation of the oil-water mixture Lubrication Systems
C The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the __________. maximum design speed of that purifier rated capacity of that purifier specific gravity of the oil being purified viscosity of the oil being purified Lubrication Systems
C In a disk type centrifugal purifier, the contaminated oil enters the centrifuge __________. at the bottom through the oil inlet through the funnel body at the top through the regulating tube through the neck of the top disk Lubrication Systems
D Clean oil leaves the centrifuge illustrated through item __________. Illustration GS-0124 K N V X Lubrication Systems
C Water removed through centrifugal force in the illustrated unit is displaced from the bowl through __________. Illustration GS-0124 X K N V Lubrication Systems
B The three wing device in the unit illustrated is maintained in its position by item __________. Illustration GS-0124 O Q R P Lubrication Systems
B Oil supply pressure to the main lube oil header of a gravity feed lube oil system is __________. the sum of the lube oil static head pressure and service pump discharge pressure the result of the height of the gravity tank above the manifold the difference between the lube oil static head pressure and service pump discharge pressure equal to the service pump discharge pressure, since the static heads of the lines to and from the gravity tank cancel out one another Lubrication Systems
A Which of the following statements is true concerning the lube oil system shown in the illustration? Illustration SE-0011 The drains from lube oil coolers can be directed back to the main sump, the sludge tank or the lube oil purifier. The gravity tank overflow line leads directly to the lube oil sludge tank. The gravity tank directly provides the normal supply of oil to the turbines and gears. The three-way temperature control valve bypasses cooling water around or through the lubricating oil cooler to maintain the desired oil temperature. Lubrication Systems
D Which of the following statements about gravity type lube oil systems is correct? Any lube oil pump failure causes immediate damage to turbine bearings. Gravity tanks are fitted with an overflow alarm. The discharge from the gravity tanks flows to the lube oil pump suction. Gravity tank overflow lines are lead directly to the lube oil sump. Lubrication Systems
D After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by __________. sounding the gravity tanks observing the flow from the bearings sounding the lube oil sump observing the overflow sight glass Lubrication Systems
B In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed __________. at a point on the outlet side of the main bearings as close to the bearings as possible at the end of the supply line header to the bearings at the outlet of the main thrust bearing at a point on the inlet side of the main bearings as close to the bearings as possible Lubrication Systems
C The maximum lube oil temperature leaving the lube oil cooler of a main steam turbine propulsion system should __________. be dictated only by the existing sea water temperature be about 180F never exceed 130F never be more than 60F below the lube oil inlet temperature Lubrication Systems
A The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.
never exceed 170F be always maintained at 130 F never exceed the inlet temperature by more than 70F not exceed the normal lube oil outlet temperature from the centrifugal purifier Lubrication Systems
B When the flow of oil admitted to a disk-type centrifugal purifier is in excess of its designed capacity, which of the following conditions will usually occur? The speed of the centrifuge will increase. The oil will discharged through the heavy phase discharge port. Oil will be present in the water sealing line to the bowl. All water will be retained by the purified oil being discharge. Lubrication Systems
A When an oil purification centrifuge loses a portion of its seal, the oil can then be discharged through the heavy phase discharge port. This is partly a result of greater __________. centrifugal force being developed on the oil near the interface centrifugal force being developed on the water seal at the side of the bowl centripetal force being developed on the oil near the interface centripetal force being developed on the water seal at the side of the bowl Lubrication Systems
D In the illustrated device, what would be a reason for oil being discharged from port "N"? Illustration GS-0124 This would be normal for the operation. The device being operated as a clarifier. The ring dam size is too small. The ring dam size is too large. Lubrication Systems
A Which of the following problems will occur if a manually cleaned disk-type centrifugal lube oil purifier contains insufficient sealing water prior to admitting oil flow to the bowl? Lube oil will discharge from the heavy phase discharge port to the sludge tank. The lube oil will overheat and flash. Contamination of the lube oil by emulsification will result. The lube oil will not be subjected to the proper centrifugal force. Lubrication Systems
D If a lube oil pump fails to build up discharge pressure, the cause could be the __________. discharge valve is open suction vacuum is high bypass valve is closed suction valve is closed Lubrication Systems
C If a tube should leak in an operating main steam turbine lube oil cooler, the water will not immediately contaminate the oil because the __________. second-stage discharge valve will open plug type bypass valve will open oil pressure is greater than the water pressure cooling pump would automatically shut off Lubrication Systems
A While a vessel is underway, which of the conditions listed would indicate a leak in the lube oil cooler? Excessive lube oil consumption. Corrosion of the journals and bearings. Contamination of the lube oil. Excessive water discharge rate from the lube oil purifier. Lubrication Systems
B While making your rounds, you notice the main lube oil temperature to be higher than normal. To remedy this situation, you should __________. open the lube oil cooler seawater inlet valve wider increase the opening of the lube oil cooler seawater discharge valve speed up the main lube oil pump throttle in on the lube oil cooler seawater discharge valve Lubrication Systems
B No lube oil appearing in the sight glass (bull's eye) of a gravity type system is a positive indication of __________. failure of all lube oil pumps no oil is overflowing the gravity tank no oil flowing to the bearings the gravity tanks being empty Lubrication Systems
A Which of the conditions listed could cause an oil flow sight glass, of a main turbine bearing, to be completely filled with oil? A restriction in the oil drain line to the sump. Excessive air trapped in the lube oil system. An increase in oil temperature. Increasing the amount of oil through the gravity tank overflow line. Lubrication Systems
C When a sudden increase in pressure occurs in a forced lubrication system, you should check for a __________. high lube oil sump level clogged lube oil pump suction loss of oil flow across one of the bearings ruptured tube in the lube oil cooler Lubrication Systems
B To determine the extent of lube oil system contamination you would __________. observe the oil flow in the sight glasses inspect the purifier for separated foreign matter maintain a close watch on bearing temperatures watch for variations in the lube oil pump discharge pressure Lubrication Systems
B Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________. causes the turbine to over speed causes pitting of the gear teeth raises the flash point of the oil to a dangerously high level results in excessive cooling of bearing surfaces Lubrication Systems
A A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by __________. excessive gland sealing steam excessive cooling water to the lube oil cooler insufficient cooling water to the lube oil cooler insufficient gland sealing steam Lubrication Systems
C Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation? Aeration, agitation, and heat Solid insoluble particles, aeration, and heat Water, agitation, and heat Water and solid insoluble particles Lubrication Systems
A Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet? Reduction gear damage. Main shaft bearing damage. Journal bearing damage. Turbine shrouding damage. Lubrication Systems
B Which of the following statements represents the function the nozzle assembly performs in an impulse turbine? Provides an area where the steam is prevented from expanding prior to being directed against the rotor blades. Converts the steam's thermal energy into kinetic energy by increasing its velocity and directing it against the rotor blades. Converts the potential energy of steam into thermal energy by increasing its pressure and directing it against the turbine blades. Increases the velocity of the steam without a pressure drop across the diaphragm. Main Turbines
B The labyrinth packing ring in an interstage diaphragm of an impulse turbine is prevented from rotating by __________. spring tension exerted on retaining rings a horizontal key joint extending into a slot steam pressure exerted on the packing segments the weight of the diaphragm acting on the packing ring Main Turbines
A Shrouding on impulse turbine blading is held in place by __________. peening the tenons circumferential dovetails seal welding locking keys Main Turbines
C Tenon peening is a technique employed by turbine manufacturers to __________. secure turbine blading to the rotor balance the turbine rotor assembly secure shroud bands to turbine blading. minimize turbine rotor axial thrust Main Turbines
A Which of the steam losses listed would be associated with a multistage impulse turbine rather than a multistage reaction turbine? Diaphragm packing loss Blade and nozzle loss Radiation loss Leaving loss Main Turbines
C The purpose of shroud bands secured to the tips of the turbine blades is to __________. increase blade resistance to moisture in steam assist in maintaining radial clearances stiffen the blades to reduce vibration strengthen the blade root fastenings Main Turbines
C Steam passing through a multistage impulse turbine does not impart any appreciable axial thrust to the rotor. This is primarily due to the __________. dummy piston and cylinder arrangement steam velocity decreasing through the nozzle diaphragms equalizing holes provided in the turbine wheel pressure drop taking place through the moving blades Main Turbines
C In an impulse turbine, the fixed blades function to __________. decrease steam velocity equalize pressure differences change the direction of steam flow prevent steam turbulence Main Turbines
B The type of turbine shown in the illustration is classified as a __________. Illustration SE-0003 pressure-compounded impulse velocity-compounded impulse pressure-compounded reaction pressure-velocity compounded impulse Main Turbines
D A pressure-velocity compounded impulse turbine consists of __________. several rows of moving blades attached to diaphragms velocity compounding with reaction pressure compounding two or more rows of nozzles in which no pressure drop exists two or more stages of velocity compounding Main Turbines
A How many Curtis stages are contained in the turbine shown in the illustration? Illustration SE-0003 1 2 3 only a reaction turbine stage is shown Main Turbines
D Design characteristics of a velocity-compounded impulse turbine include the utilization of __________. one or more nozzles with one row of rotating blades a low velocity steam jet from a nozzle two or more simple impulse stages a single pressure stage with two or more velocity stages Main Turbines
D Nozzle diaphragms are installed in pressure-compounded impulse turbines to __________. eliminate blade and nozzle losses support shrouding support moving blades hold the nozzles of the stage and admit steam to moving blades Main Turbines
A An impulse-reaction turbine is characterized by which of the following arrangements? Velocity-compounded stages followed by reaction blading. Stationary nozzles with impulse blading stages. Reaction blading followed by impulse diaphragms. Reaction stages followed by velocity-compounded blading. Main Turbines
C The general method of reducing turbine reaction blade vibration is by the use of __________. casing diaphragms dummy pistons binding wire casing seal strips Main Turbines
B In what classification of steam turbines are the moving blades and the adjacent fixed rows of blades shaped to act as nozzles? Impulse Reaction Helical flow Radial flow Main Turbines
C In which type of turbine does a pressure drop exist through the fixed blades and the moving blades? Curtis Rateau Reaction Impulse Main Turbines
C An energy loss associated with a reaction turbine, but not an impulse turbine, is __________. throttling loss windage loss tip leakage loss leaving loss Main Turbines
A What is used to compensate for the increased possibility of blade vibration occurring with impulse turbine blading? Securing the blade tips with shrouding. The decreased pressure drop across the blade due to the thin tip design. Seal stripping the groove within the turbine casing. Tuned vibration dampers. Main Turbines
A A pressure drop occurs across both the moving and fixed blades of a reaction turbine as a result of the __________. moving and fixed blades being shaped to act as nozzles reversing blades causing a velocity drop with resultant pressure drop interstage diaphragms creating a nozzle effect in the steam flow conversion of the thermal energy to pressure energy always resulting in a pressure drop Main Turbines
D Which of the parts listed for a reaction turbine serve the same function as the nozzles of an impulse turbine? Moving blades only Moving nozzles Fixed nozzles Fixed blades and moving blades Main Turbines
D Why do double flow reaction turbines produce very little axial thrust? Because there is no pressure drop across the blades. Because equalizing holes are provided in the turbine wheels. Because partially expanded steam is exhausted to the low pressure turbine where the expansion is completed. Because the axial thrust is developed on the rotor in opposite directions providing counterbalance. Main Turbines
A What happens to the steam as it moves across the moving blades in a reaction turbine? It creates an axial thrust in the direction of the steam flow. It loses velocity at constant pressure. It gains velocity at constant pressure. It creates an axial thrust opposing the direction of steam flow. Main Turbines
A Large temperature and pressure drops which occur in the first stage of a combination impulse and reaction turbine are caused by steam passing through __________. one or more velocity-compounded impulse stages at the high pressure end of the turbine a single row of blades more than once a dummy piston and cylinder to offset axial thrust a nozzle diaphragm in the low pressure end of the turbine Main Turbines
C Concerning the classification of steam turbines, a cross compound designed unit __________. consists of one Curtis stage and reaction blading is made up of a varied assortment of impulse and reaction staging consists of a high pressure turbine, crossover pipe, and low pressure turbine consists of reaction stages and a dummy piston Main Turbines
D In a cross-compounded turbine propulsion plant, steam enters the __________. high pressure, intermediate and low pressure units simultaneously high pressure unit and then cross-flows to the condenser high and low pressure units simultaneously high pressure unit and then flows through a crossover to the low pressure unit Main Turbines
B Why is superheated steam used in the main propulsion turbines instead of saturated steam? Less specific energy available per pound of steam. Greater heat energy available per pound of steam. Higher pressure available than saturated steam. Lower required specific volume than saturated steam. Main Turbines
D What is generally found at the end of the low pressure turbine rotor of a cross-compound turbine arrangement? Cruising turbine Back pressure turbine High pressure turbine Astern turbine Main Turbines
C As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced because it __________. becomes saturated again diminishes in volume expands in volume becomes superheated again Main Turbines
C When a turbine is in operation, a rotor position micrometer is used to determine any change in rotor __________. axial position relative to the micrometer radial position relative to the casing axial position relative to the casing radial position relative to the micrometer Main Turbines
D A turbine assembly in which steam flows in series through a high pressure turbine and then on to a low pressure turbine, with both turbines driving a common reduction gear through separate shafts, is classified as __________. tandem-compound dual series tandem, double flow cross-compound Main Turbines
B As steam first enters the main propulsion turbine, which of the following energy conversions takes place? mechanical to thermal potential to kinetic chemical to thermal thermal to chemical Main Turbines
A For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________. pivoted segmental shoe overhung turbine wheel self-oiling sleeve self-aligning shell Main Turbines
D Journal bearings used with modern turbine rotors are manufactured in two halves in order to __________. maintain axial alignment and reduce thrust facilitate interchanging with other bearing halves provide for positive oil flow at all loads permit removal of the bearing without removing the rotor from the turbine Main Turbines
C Which of the journal bearings listed most easily accommodates the minor turbine shaft misalignment? Spring bearings Roller bearings Spherically seated bearings Ball bearings Main Turbines
D The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to __________. ensure efficient lubrication of the bearing prevent the leakage of main steam into the oil direct the flow of oil through the bearing prevent the external leakage of oil out of the bearing housing Main Turbines
C The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine __________. interstage packing thrust bearing journal bearings diaphragms Main Turbines
C On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the __________. blade axial clearance Babbitt thickness oil clearance and bearing wear diaphragm tip clearance Main Turbines
C Main steam turbine bearings are lined with __________. ferrous oxide cast-iron Babbitt steel Main Turbines
C For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________. self-aligning shell self-oiling sleeve pivoted segmental shoe overhung turbine wheel Main Turbines
B An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________. asbestos gaskets precision metal-to-metal contact copper gaskets flexible steel seal strips Main Turbines
C Turbine casing flanges are sometimes provided with a system of joint grooving to __________. form a labyrinth seal between the casing halves increase contact pressure between the casing halves' flanges inject sealing compound between the casing halves ensure perfect alignment of casing halves Main Turbines
B Allowance for axial expansion of a steam turbine due to temperature changes is provided for by the use of __________. casing flexible joints a deep flexible I beam support pivoted-shoe type thrust bearings rotor position indicators Main Turbines
C Which of the devices listed is found on an LP main propulsion steam turbine casing? HP turbine bypass valve Sliding beam Sentinel valve Duplex set of relief valves Main Turbines
B The purpose of the sentinel valve installed on a turbine casing is to __________. vent excess steam to the main condenser warn the engineer of excessive pressure in the low pressure turbine casing warn the engineer of back flow of steam from the exhaust trunk relieve excess pressure to the turbine extraction points Main Turbines
B The astern element of a main propulsion turbine is usually designed as a/an __________. Parsons stage, reaction turbine Curtiss stage, impulse turbine multiple entry, helical flow turbine single entry, double flow turbine Main Turbines
D Which of the following statements is true concerning the turbine shown in the illustration? Illustration SE-0016 The low pressure turbine is designed with reaction type stages The astern element is of the Curtis type consisting of two three-row stages The ahead rotor can be classified as a helical flow, Parsons type turbine A steam deflector is provided between the astern element and the ahead stages of the LP turbine. Main Turbines
C Labyrinth seals used to reduce leakage around a turbine shaft are constructed of __________. staged rubber composition seal stripping spring bound carbon segments machined metallic packing strips or fins braided asbestos covered core segments Main Turbines
A When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________. seal the casing during periods of low casing pressure maintain the rotor journal temperature seal the casing during periods of high casing pressure provide a constant flow to the gland leak off condenser Main Turbines
B The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing __________. pressure increases through successive seal stages successive pressure drops through the seal stages increased turbulence through successively larger labyrinth clearances successive temperature drops through the seal stages Main Turbines
A Labyrinth packing rings are installed on turbine diaphragms to minimize __________. interstage steam leakage along the turbine rotor steam from escaping to the atmosphere pressure buildup on both sides of the diaphragm air leakage from entering the turbine casing Main Turbines
D Where are moisture shields located in a main propulsion steam turbine? At the steam strainer inlet Around throttle valve stems At the inner stage diaphragms After the last stage of the ahead rotor blading Main Turbines
A The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the __________. high speed pinion rotor low speed pinion rotor low speed gear rotor bull gear Main Turbines
A The jacking gear on main propulsion turbines can be used to __________. provide reduction gear tooth inspection provide propulsion in emergencies reduce turbine speed during maneuvering lift the reduction gear casing Main Turbines
D The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the __________. lubricating oil from the high-speed pinion can easily supply the turning gears arrangement allows for the use of a muff type coupling for flexibility and smooth engagement turning gears are double reduction worm type and cannot mate with the low pressure high-

 speed pinion
greatest gear ratio between the turning gear motor output and bull gear can be obtained Main Turbines
D Which of the devices listed is generally used to engage the main engine turning gear to the high-pressure turbine high-speed pinion? Manually operated band brake Quill shaft Sleeve coupling Manually operated sliding jaw clutch Main Turbines
B The main propulsion turbine should be operated with the __________. lowest practical chest pressure and the maximum number of nozzles possible to maintain the desired speed highest practical chest pressure and the minimum number of nozzles required to maintain the desired speed lowest practical chest pressure and the minimum number of nozzles required to maintain the desired speed highest practical chest pressure and the maximum number of nozzles possible to maintain the desired speed Main Turbines
A Operating a steam turbine propulsion unit at medium speed, in an area with extremely cold seawater and the main circulating pump providing full cooling water flow to the condenser will result in __________. increased condensate aeration due to the inability of the air ejectors to remove excessive air accumulation from the condenser increased effectiveness of the air ejectors due to the increased main condenser vacuum increased plant efficiency due to increased condensate depression excellent plant efficiency due to higher attainable vacuum Main Turbines
B During normal operation of a main propulsion turbine, the lube oil supply temperature to the bearings should be maintained at approximately __________. 135F 110F 72F 60F Main Turbines
B Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________. the gland seal steam system is operating the main lube oil system is operating the condensate system is operating the main salt water circulating pump is operating Main Turbines
D The most critical period of main turbine operation is during cold start-up, rather than hot shutdown because __________. harmonic vibrations associated with critical speed can easily be reached during start-up the danger of blade erosion damage from dry steam impingement is greater during start-up lubricant film thickness during start-up is considerably less than the dimensions of gear surface irregularities differential expansion can result from the temperature difference between the rotor and rotor casing Main Turbines
A Prior to rolling the main turbines in preparation for getting underway, you should __________. disengage the turning gear circulate the lube oil through the emergency lube oil cooler secure the gland sealing steam regulator open the reduction gear casing access plates and inspect the lube oil spray pattern Main Turbines
B Which of the listed procedures should be followed when raising vacuum on the main propulsion plant prior to getting underway? Start the lube oil system, start the second-stage air ejector and the gland sealing system, start the condensate and circulating pumps, and start the turning gear. Start the lube oil system, engage the turning gear, start the condensate and circulating pumps, start the gland sealing system and second-stage air ejector. Start the condensate and circulating pumps, start the lube oil system, start the air ejectors and the gland sealing system, and engage the turning gear. Start the condensate and circulating pumps, engage the turning gear, start the lube oil system, then start the first-and second-stage air ejectors and the gland sealing. Main Turbines
B After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the __________. ahead throttle valve astern throttle valve LP turbine bleed valve HP turbine bleed valve Main Turbines
A When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________. top of the turbine exhaust trunk turbine bleed lines casing joints Main Turbines
B With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________. warm the astern guarding valve and the low lube oil pressure throttle trip reduce the possibility of warping the turbine rotors distribute the gland sealing steam evenly throughout the glands slowly bring the lube oil and bearings to operating temperature Main Turbines
D To stop the rotor of a main turbine while underway at sea you should __________. secure all steam to the turbine tighten the stern tube packing gland apply the prony brake admit astern steam to the turbine after securing the ahead steam Main Turbines
D The jacking gear must be engaged as quickly as possible when securing the Main Turbines in order to __________. permit rapid cooling of the reduction gears maintain a constant supply of lube oil to the main unit prevent the stern tube bearing from overheating prevent uneven cooling of the turbine rotors Main Turbines
B To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged? The brake on the first reduction worm shaft must be set. The propeller shaft must be stopped and held stationary until the clutch is engaged. The engine order telegraph must be on 'stop'. The speed of the astern turbine must be reduced. Main Turbines
C When securing a main propulsion turbine equipped with carbon packing glands, the vacuum should always be broken before securing the gland seal steam because __________. gland seal leak off lines will flood with water
 
o
the turbine rotor expands faster than the gland casing cold air rapidly entering the gland may result in damage to the carbon segments and sealing surfaces loop seal will flood the after condenser Main Turbines
D In securing the main turbines, steam to the second stage air ejectors should be left on for a short period of time in order to __________. insure equal cooling of the main turbine bearings prevent excessive condensate depression remove the excessive amount of non-condensable vapors which accumulated during

 maneuvering operations
dry out the main turbines Main Turbines
D The FIRST step in breaking vacuum on a main turbine unit should be to __________. secure the steam to the gland seal system stop the main circulating pump stop the main condensate pump secure the steam to the main air ejector Main Turbines
D A common cause of the Babbitt linings cracking in a turbine journal bearing is from __________. excessive thrust bearing wear prolonged operation at low speed prolonged operation at full speed vibration generated by the rotor Main Turbines
D Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________. an intermittent vibration when changing speed metal particles in the lube oil purifier rubbing noises when jacking over the main unit taking rotor position indicator readings Main Turbines
C The original bridge gage reading for a reduction gear bearing was measured as 0.008 inches. A year later, the bridge gage reading for the same bearing is 0.010 inches. This indicates __________. oil clearance is .002 inch bearing wear is .010 inch bearing wear is .002 inch oil clearance has increased .010 inch Main Turbines
C The main propulsion turbine can be damaged by __________. maintaining vacuum too high using the jacking gear when there is no vacuum water carryover from the boilers operating at slow speeds Main Turbines
D An overheated bearing in the main propulsion unit is indicated by __________. bubbles in the sight flow glasses sludge in the lube oil strainers high level in the lube oil sump high temperature of the lube oil leaving the bearing Main Turbines
A While a vessel is underway the low pressure turbine high-speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction? Reduced speed ahead only Reduced speed ahead and full speed astern Reduced speed astern and full speed ahead Reduced speed astern only Main Turbines
C Journal bearings used with modern turbine rotors are manufactured in two halves in order to __________. facilitate interchanging with other bearing halves provide for positive oil flow at all loads permit removal of the bearing without removing the rotor from the turbine maintain axial alignment and reduce thrust Main Turbines
A The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to __________. prevent the external leakage of oil out of the bearing housing prevent the leakage of main steam into the oil direct the flow of oil through the bearing ensure efficient lubrication of the bearing Main Turbines
C On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the __________. diaphragm tip clearance Babbitt thickness oil clearance and bearing wear blade axial clearance Main Turbines
B Main steam turbine bearings are lined with __________. ferrous oxide Babbitt steel cast-iron Main Turbines
C For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________. self-oiling sleeve self-aligning shell pivoted segmental shoe overhung turbine wheel Main Turbines
B An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________. copper gaskets precision metal-to-metal contact flexible steel seal strips asbestos gaskets Main Turbines
A Turbine casing flanges are sometimes provided with a system of joint grooving to __________. inject sealing compound between the casing halves form a labyrinth seal between the casing halves ensure perfect alignment of casing halves increase contact pressure between the casing halves' flanges Main Turbines
B Allowance for axial expansion of a steam turbine due to temperature changes is provided for by the use of __________. rotor position indicators a deep flexible I beam support casing flexible joints pivoted-shoe type thrust bearings Main Turbines
C Which of the devices listed is found on an LP main propulsion steam turbine casing? HP turbine bypass valve Sliding beam Sentinel valve Duplex set of relief valves Main Turbines
B The purpose of the sentinel valve installed on a turbine casing is to __________. vent excess steam to the main condenser warn the engineer of excessive pressure in the low pressure turbine casing relieve excess pressure to the turbine extraction points warn the engineer of back flow of steam from the exhaust trunk Main Turbines
A The astern element of a main propulsion turbine is usually designed as a/an __________. Curtiss stage, impulse turbine single entry, double flow turbine Parsons stage, reaction turbine multiple entry, helical flow turbine Main Turbines
A Which of the following statements is true concerning the turbine shown in the illustration? Illustration SE-0016 A steam deflector is provided between the astern element and the ahead stages of the LP turbine. The ahead rotor can be classified as a helical flow, Parsons type turbine The astern element is of the Curtis type consisting of two three-row stages The low pressure turbine is designed with reaction type stages Main Turbines
B Labyrinth seals used to reduce leakage around a turbine shaft are constructed of __________. spring bound carbon segments machined metallic packing strips or fins staged rubber composition seal stripping braided asbestos covered core segments Main Turbines
A When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________. seal the casing during periods of low casing pressure maintain the rotor journal temperature seal the casing during periods of high casing pressure provide a constant flow to the gland leak off condenser Main Turbines
B The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing __________. increased turbulence through successively larger labyrinth clearances successive pressure drops through the seal stages successive temperature drops through the seal stages pressure increases through successive seal stages Main Turbines
D Labyrinth packing rings are installed on turbine diaphragms to minimize __________. steam from escaping to the atmosphere pressure buildup on both sides of the diaphragm air leakage from entering the turbine casing interstage steam leakage along the turbine rotor Main Turbines
D Where are moisture shields located in a main propulsion steam turbine? Around throttle valve stems At the inner stage diaphragms At the steam strainer inlet After the last stage of the ahead rotor blading Main Turbines
C The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the __________. bull gear low speed gear rotor high speed pinion rotor low speed pinion rotor Main Turbines
A The jacking gear on main propulsion turbines can be used to __________. provide reduction gear tooth inspection provide propulsion in emergencies reduce turbine speed during maneuvering lift the reduction gear casing Main Turbines
A The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the __________. greatest gear ratio between the turning gear motor output and bull gear can be obtained turning gears are double reduction worm type and cannot mate with the low pressure high-speed pinion lubricating oil from the high-speed pinion can easily supply the turning gears arrangement allows for the use of a muff type coupling for flexibility and smooth engagement Main Turbines
D Which of the devices listed is generally used to engage the main engine turning gear to the high-pressure turbine high-speed pinion? Manually operated band brake Quill shaft Sleeve coupling Manually operated sliding jaw clutch Main Turbines
B Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________. the condensate system is operating the main lube oil system is operating the gland seal steam system is operating the main salt water circulating pump is operating Main Turbines
D Prior to rolling the main turbines in preparation for getting underway, you should __________. circulate the lube oil through the emergency lube oil cooler secure the gland sealing steam regulator open the reduction gear casing access plates and inspect the lube oil spray pattern disengage the turning gear Main Turbines
D After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the __________. HP turbine bleed valve ahead throttle valve LP turbine bleed valve astern throttle valve Main Turbines
C When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________. turbine bleed lines exhaust trunk top of the turbine casing joints Main Turbines
A With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________. reduce the possibility of warping the turbine rotors warm the astern guarding valve and the low lube oil pressure throttle trip slowly bring the lube oil and bearings to operating temperature distribute the gland sealing steam evenly throughout the glands Main Turbines
D To stop the rotor of a main turbine while underway at sea you should __________. apply the prony brake tighten the stern tube packing gland secure all steam to the turbine admit astern steam to the turbine after securing the ahead steam Main Turbines
A To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged? The propeller shaft must be stopped and held stationary until the clutch is engaged. The engine order telegraph must be on 'stop'. The brake on the first reduction worm shaft must be set. The speed of the astern turbine must be reduced. Main Turbines
D A common cause of the Babbitt linings cracking in a turbine journal bearing is from __________. prolonged operation at low speed prolonged operation at full speed excessive thrust bearing wear vibration generated by the rotor Main Turbines
C When a turbine bearing shows signs of overheating, you should __________. increase the lube oil pump discharge pressure stop the turbine immediately reduce speed increase the cooling water supply to the lube oil cooler Main Turbines
A If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur? Destruction of the jacking gear. Excessive tooth stress on the high pressure first reduction pinion. A possibility of shearing the jacking gear flexible coupling. Uneven warming of the turbine. Main Turbines
A Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________. taking rotor position indicator readings metal particles in the lube oil purifier rubbing noises when jacking over the main unit an intermittent vibration when changing speed Main Turbines
B Raising vacuum on a main turbine unit without using the turning gear will result in __________. excessive time being required to raise vacuum uneven heat distribution in the rotor unit scoring of the rotor in way of the labyrinth packing overheating of the second-stage air ejector Main Turbines
C The original bridge gage reading for a reduction gear bearing was measured as 0.008 inches. A year later, the bridge gage reading for the same bearing is 0.010 inches. This indicates __________. oil clearance is .002 inch bearing wear is .010 inch bearing wear is .002 inch oil clearance has increased .010 inch Main Turbines
D If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should __________. stop the turbine and not answer any more bells open the throttle wider to pass through the critical speed hold the turbine at that speed until vibration stops immediately slow the turbine to see if the vibration will stop Main Turbines
B The main propulsion turbine can be damaged by __________. maintaining vacuum too high water carryover from the boilers operating at slow speeds using the jacking gear when there is no vacuum Main Turbines
B An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________. a labyrinth seal failure a carryover from the boiler overloading of the condenser a reduction in condenser vacuum Main Turbines
A An overheated bearing in the main propulsion unit is indicated by __________. high temperature of the lube oil leaving the bearing bubbles in the sight flow glasses high level in the lube oil sump sludge in the lube oil strainers Main Turbines
C The turbine of a turbo-electric drive should be secured by __________. dynamic braking of the generator closing the throttle by hand tripping the throttle trip by hand closing the main steam stops Main Turbines
C An auxiliary turbine boiler feed pump should normally be stopped by __________. closing the exhaust valve slightly rotating the hand lube oil pump backwards actuating the throttle hand tripping device increasing the load on the driven unit Main Turbines
A The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. centrifugal force high back pressure hydraulic pressure pneumatic force Main Turbines
D Most auxiliary turbine feed pumps do not require an external source of gland sealing steam because they __________. operate with only a small amount of axial thrust operate at relatively low pressures utilize carbon packing rings at the low pressure end exhaust to pressures above atmospheric pressure Main Turbines
A Packing rings installed on auxiliary turbines are generally lubricated by __________. moisture in the turbine steam separate lube oil lines a salt water service line a water leak off line Main Turbines