Assistant Engineer Limited Practice Test

The first engineer-officer step above QMED on Limited vessels: motor, steam and gas turbine plants, electrical, safety. Coast Guard exam code AEL01.

410 real questions from the Coast Guard National Maritime Center's public sample exams, free. Each module needs 70% to pass.

Passing score: Coast Guard pass marks module by module, and the retest rules

What's free: daily rounds, the Brig, the drills and the Pass Meter, for every license. Your first module test is free too. After that, the full Exam Room is $19, once. No subscription.

What's on the test

Picture questions link to the drawing in the Coast Guard's free sample PDF. A few that need reference tables are left out.

10 sample questions

1. When an engine fitted with a hydraulic starting system starts up, the starter is protected from the higher speed of the engine by __________.

   • A.the immediate increase in hydraulic pressure
   • B.the overrunning clutch
   • C.closing the starting check valves
   • D.the pivoting of the shaft from being engaged with the flywheel
   Show answer

   B. the overrunning clutch

   Q800, Junior Engineer, Part I

2. The primary source of steam to the auxiliary exhaust system is typically supplied directly from __________.

   • A.turbine driven and reciprocating steam pumps
   • B.the main engine LP bleed
   • C.the turbine gland exhaust system
   • D.all of the above
   Show answer

   A. turbine driven and reciprocating steam pumps

   Q800, Junior Engineer, Part I

3. The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________.

   • A.girder stays
   • B.fire-tubes and stay-tubes
   • C.external boiler plating
   • D.separate crown sheets
   Show answer

   B. fire-tubes and stay-tubes

   Q800, Junior Engineer, Part I

4. What should be done if localized scoring is discovered on a pump shaft sleeve during routine maintenance inspection?

   • A.Reassemble the pump and set the governor to obtain a slower speed.
   • B.Check for parallel alignment of the sleeve radial face to the sleeve bore.
   • C.Reassemble the pump and provide more water leakoff for lubrication.
   • D.Correct the cause of scoring and install a new shaft sleeve.
   Show answer

   D. Correct the cause of scoring and install a new shaft sleeve.

   Q800, Junior Engineer, Part I

5. Which extinguishing agent is the best for use on electrical fires?

   • A.Water fog
   • B.CO2
   • C.Dry chemical
   • D.Foam
   Show answer

   B. CO2

   Q451, Deck General / Safety

6. Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard?

   • A.a voltage tester with a high input impedance and a voltage rating higher than any expected measured voltages
   • B.a voltage tester with a low input impedance and a lower voltage rating than any expected measured voltages
   • C.a voltage tester with a low input impedance and a higher voltage rating than any expected measured voltages
   • D.a voltage tester with a high input impedance and a lower voltage rating than any expected measured voltages
   Show answer

   A. a voltage tester with a high input impedance and a voltage rating higher than any expected measured voltages

   Q801, Junior Engineer, Part II

7. Compared to a naturally aspirated diesel engine, a supercharged diesel engine has __________.

   • A.a cylinder air charge of higher pressure
   • B.reduced cylinder mean effective pressure
   • C.less valve overlap
   • D.reduced blow-by
   Show answer

   A. a cylinder air charge of higher pressure

   Q800, Junior Engineer, Part I

8. Babbitt is a metal alloy commonly used for lining __________.

   • A.shim stock
   • B.valve seats
   • C.precision bearings
   • D.saltwater piping
   Show answer

   C. precision bearings

   Q806, Fireman / Watertender

9. Auxiliary boilers are divided into several classifications, one of which is __________.

   • A.water-tube supercritical circulation
   • B.water-tube forced circulation
   • C.fire-tube controlled circulation
   • D.fire-tube express circulation
   Show answer

   B. water-tube forced circulation

   Q805, Oiler, Part II

10. In general, the thermal bulb for a thermal expansion valve used in a reciprocating air conditioning system is usually charged with what substance?

    • A.mercuric sulfate
    • B.bees wax
    • C.the same refrigerant as the system
    • D.distilled water
    Show answer

    C. the same refrigerant as the system

    Q801, Junior Engineer, Part II

What the study guide does

• Short daily rounds of 10 questions, with a streak.
• Practice tests built like the real one, scored with the real pass marks (first one free, then $19 once for the full Exam Room).
• The Brig: questions you miss come back until you get them right twice.
• Pass Meter: your chance of passing every module if you sat it today, worked out from your own answers.