, Training for Mariners. The First with Online Study for the Maritime Industry.

  Welcome to Established in 1996, we are the ultimate source for online USCG exam preparation assistance. provides free online exam preparation along with downloadable studyguides and standalone software that allows you to continue your studies without an internet connection.


Prepare for or supplement your studies for your USCG license exam here.

Click here to create an account and enter SeaSources new online study.


Hi! We have a new website! It's phone / tablet friendly and speedier. Please visit it today! 

The subjects listed below are currently available for testing in the new online study room and are available for download to your computer. Click on subject below for details.

Engineering Examination Questions

All Engine Room Questions

Engine Room Electrical         

Engine Room General          

Engine Room Safety            

Engine Room Steam            

Engine Room Motor   

QMED Oiler          

Deck Examination Questions

Master 25/50/100 Ton

Operator Uninspected Passenger Vessel

All Deck Questions

Able Seaman Questions

Advanced Subjects, Unlimited Oceans Master, Mate

Rules of the Road  

Aids to Navigation  Glossary Included

Breathing Apparatus

Cargo Equipment 

Cargo Stowage

Charts and Publications 

Chemical Testing

Right Whales

Damage Control  

Deck Engineering

Deck Safety

Emergency Procedures 

FCC Exam Questions

Fire Fighting Glossary Included 

First Aid  


Great Lakes

Hazardous Cargo

Inert Gas

Inland Navigation  

Instruments and Accessories



Liquid Cargo and Bunkering

Marine Radio Operator 

Meteorology  "Glossary Included" 

Mobile Offshore Drilling Unit

Latest NMC / USCG Questions

Celestial Navigation

Navigational Procedures

Pollution Control and Prevention

Rules and Regulations

Plotting/Navigational Problems


Survival Craft

Seamanship   Glossary Included

Sailing Vessels  

Ship Handling 

Ships Construction Glossary Included  

Ships Business


Stability and Trim Glossary Included 


Tides and Currents Glossary Included 



Common Knots

Radar Plotting



Steam Plants

Preview Steam Plants I Questions


Preview Steam Plants II Questions

    Listed below is a table of contents of the questions on this subject as they appear in the new online study. Click on the "Enter Online Study" link above to begin preparing for your exam.

   If you are studying for a United States Coast Guard Engine Room License exam which includes this module, you should  work through these questions until you are scoring 80% or better on them.

From the pull down menu in the online study select from the following topics:

  • All USCG Engine Room Question Databank
    • Steam Plants
      • Boiler water principles
        • Analysis
          • Boiler Water Samples
          • Chloride Content
          • Ph Value
          • Sodium Phosphate
          • Sulfide Test
        • Problems 
          • De-superheaters
          • High Alkalinity
          • Priming, Foaming, and Carryover
        • Treatment 
          • Boiler Lay Up Wet-dry
          • Boiler Water Chemical
          • Feed Line
          • Concentration of Solids
          • Dissolved Oxygen and Hydrazine
          • Keeping Scale From Watersides
          • Ph Values of Treatment
          • Purpose of Continuous Blow
      • Condensate systems
        • Condensate system components: function and operation
          • Air Ejectors and Equipment
          • Condensate Piping
          • D. C. Heater Components
          • First Stage_ Lp Feedwater Heater
          • Steam Whistle
        • Maintenance
          • Main Condenser Lay Up
          •  Main Condenser Maintenance
        • Troubleshooting, Watchstanding
          • Air Ejector Problems
          • Atmospheric Drain Tank
          • Condensate Systems Troubleshooting
          • D.C. Heater
          • Steam Whistle
      • Feedwater systems
        • Feedwater system components: function and operation
          • Feed Pump Operation
          • Main Boiler Feed Water Regulator
        • Troubleshooting, Watchstanding
          • Feedwater Regulators
      • Fuel oil combustion and control principles
        • Fuel oil management 
          • Hi_low F.O. Service Suction Line
          • Fuel Oil Settling Tanks
          • Transferring Fuel
          • Storage of Fuel Oil
        • Physical and chemical properties 
          • Btu Content
          • Fuel Oil Chemical Properties
          • Sulfur In Fuel
        • Components: operation and function
          • Combustion Control Systems
          • Forced Draft Fans
          • Fuel Oil Burner and Registers
          • Fuel Oil Quick Closing Valves
          • Fuel Oil Service Pumps
        • Maintenance
          • Cleaning Burner Tips
        • Operating procedures
          •  Increasing, Decreasing Firing Rate
          • Raising Steam On A Boiler
          • Securing Main Boiler
          • Shrink & Swell
        • Troubleshooting, Watchstanding 
          • "panting" Boiler
          • Combustion Control Systems
          • Combustion Gas Leak
          • Dec_inc Feed Water Temperature
          • Fuel Oil Burner Problems
          • Furnace Explosion
          • Heat Loss In A Boiler
          • High Water Level
          • Low Economizer Temp
          • Low Water Level
          • Oil Fire Double Casing
          • Water In Fuel Oil Settling Tanks
      • Main boilers
        • Construction: operation and function 
          • Air Heaters
          • Boiler Refractory
          • Boiler Tubes
          • Boiler Water Gage Glasses
          • Desuperheaters
          •  Dry Pipe
          • Economizer
          • Internal Feed Pipe
          • Safety Valves
          •  Soot Blowers
          • Steam Drum: Internal and Fittings
          • Steam Piping
          • Superheaters
          • Construction and Classification
        • Maintenance
          • Boiler Gage Glasses
          • Cleaning and Inspecting Watersides
          • Hydrostatic Test
          • Oil Deposits Watersides
          • Plastic & Chrome Ore Repairs
          • Safety Valve
          • Screen Tubes
          • Sliding Feet
          • Super Heater Repairs
          • Testing Boiler Welds
        • Troubleshooting, Watchstanding
          • Boiler Gage Glass Problems
          • Boiler Tube Damage
          • Brick Work Problems
          • Economizer Fire and Soot Build Up
          • Economizer Leaks
          • Handhole Gasket
          • Steam Drum Safety Valve
      • Steam principles and basic systems
        • Principles    
          • Charts
          • End Points
          •  Combustion, Circulation, Firing
          •  Principles
        • Systems
          • Automatic Steam Pressure Controls
          • Auxiliary Exhaust System
          • Auxiliary Steam Systems
          • Condensate Drain Systems
          • Contaminated Drain System
        • Troubleshooting, Watchstanding 
          • Oil In Drain Inspection Tank
          • Water Hammer
      • Theory
        • Definitions
        •  Math
      • Watch duties
        •  Components: operation and functions
          •  Steam Turbines
      • Auxiliary turbines
        •   Components: operation and function
          • Turbine Boiler Feed Pump
          • Turbo-electric Generators
        • Troubleshooting, Watchstanding
          •  T-g Damage Due To Carryover
      • Drive systems
        • Components: operation and function
          • Babbitt Lined Bearings
          • Kingsbury Thrust
          • Bearing
          • Reduction Gears - General
          • Shafts, Couplings, Etc.
        • Maintenance
          • L.O. Strainers
          • Reduction Gears
        • Troubleshooting, Watchstanding
          • Cracking of Babbitt Lining
          • Reduction Gears
      • Governing and control systems
        • Components: operation and function
          • Constant Pressure Feed Pump Gov.
          • Mechanical - Hydraulic Governor
          • Turbo Gen. Hyd. Gov.
          • Troubleshooting
      • Lubrication systems
        • Components
          • Deflector Rings
          • Gravity Feed L. O. Systems
          •  L. O. Purifier
          • Pressure Type L. O. System
        •  Maintenance
          • Filtering, Straining
        • Troubleshooting, Watchstanding 
          • Bearing Temperature
          • Increase_ Decrease In L. O. Pressure
          • L.O. Operating Problems
          • Metal Particles In Strainer
      • Main turbines
        • Components: Construction, Operation and Function
          • Axial Thrust Flexible Coupling
          • Carbon Rings
          • Astern Turbine Operation
          • Axial Thrust In Impulse Turbines
          • Cold Start Up
          • Gland Sealing Steam
          • Cross Compound Turbine & Bleed Steam
          • Impulse-reaction Turbine
          • Securing Main Turbine
          • Sentinel Valve
          • Superheated Steam
          • Supporting I Beam Expansion
          • Turbine Astern Element
        • Maintenance
          • Bridge Gage
        • Troubleshooting, Watchstanding
          • Cutting Out L. P. Turbine
          • Discoloration of Diaphragm Joints
          • Excessive Gland Seal Steam
          • Turbine Blade Erosion
      • Miscellaneous
        • Maintenance
          • Watch Duties: Motor Plants
      • Watch duties
        • Components: operation and functions
          • Boilers
          • Steam Turbines
          • Watch Problem Prioritization

 If you are studying for a United States Coast Guard Engine Room License exam which includes this module, you should  work through these questions until you are scoring 80% or better on them.

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Copyright 2000 by All rights reserved.
Revised: 12 May 2020 18:34:34 -0400 

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For details on license requirements, application forms,  licensing fees, and testing locations, visit the United States Coast Guard / National Maritime Centers web site and look under Mariner's information center. The questions used in the online study are once again available to the public in PDF format from the NMC link above. The illustrations are not yet available for some of these questions.

Vessel Nomenclature  

View Screenshots of "TesTTaker" Software  

View Screenshots/Tutorial of Online Study

View comments from SeaSources Members 

See also:

SeaSources online Celestial Navigation Course 

MARYLAND NAUTICAL  Great source for practice charts and study guides


National Oceanic & Atmospheric Administration (NOAA)

The Navigation Center

Chart No. 1 Nautical Chart Symbols Abbreviations and Terms

Bluewater Books and Charts 

Search CFR'S Online

Open Book Renewals

Required Subjects for all Deck Licenses

Required Subjects for all Engineering Licenses

Required Subjects for Mobile Offshore Drilling Units, MODU.

Sea Service Requirements for Coast Guard Licenses