Assistant Engineer MODU Practice Test (MODE02)

Assistant engineer on mobile offshore drilling units (drill rigs): motor plants, safety, general subjects. Coast Guard exam code MODE02.

149 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. Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must __________.

   • A.ensure that the hydraulic fluid reservoir is full
   • B.place all control levers in the 'HOLD' position
   • C.bleed off all hydraulic pressure from the system
   • D.block all hydraulic hoses using high-pressure covers
   Show answer

   C. bleed off all hydraulic pressure from the system

   Q605, Chief Engineer Limited: Steam Plants

2. The advantage of using a dry chemical fire extinguishing agent is __________.

   • A.its excellent cooling ability
   • B.permanent extinguishment regardless of the reignition sources
   • C.its good stability and non-toxicity
   • D.all of the above
   Show answer

   C. its good stability and non-toxicity

   Q801, Junior Engineer, Part II

3. 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

4. The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by __________.

   • A.turning down the piston skirt to concentric values
   • B.knurling the piston skirt surface
   • C.building up the piston skirt with a liquid epoxy material and then re-machining
   • D.increasing the dimensions of the ring land grooves
   Show answer

   B. knurling the piston skirt surface

   Q610, Assistant Engineer Limited: Motor Plants

5. A tank has been sealed and unventilated for a long period of time. Which of the following statements is true?

   • A.Water vapor present when the tank was sealed has oxidized.
   • B.The tank is safe to enter.
   • C.The tank is especially dangerous to enter.
   • D.Carbon monoxide is present.
   Show answer

   C. The tank is especially dangerous to enter.

   Q801, Junior Engineer, Part II

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. An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.

   • A.decrease in maximum cylinder pressure
   • B.increase in ignition lag
   • C.decrease in fuel consumption per horsepower-hour
   • D.decrease in exhaust manifold pressure
   Show answer

   C. decrease in fuel consumption per horsepower-hour

   Q610, Assistant Engineer Limited: Motor Plants

8. Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?

   • A.Its smothering effect is excellent for class B fires.
   • B.Carbon dioxide is corrosive when exposed to fire.
   • C.Its total cooling effect is far greater than water.
   • D.Carbon dioxide should be applied slowly to a large engine room fire.
   Show answer

   A. Its smothering effect is excellent for class B fires.

   Q802, Electrician

9. Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.

   • A.reservoir expansion chamber
   • B.atmosphere as heat
   • C.fluid as friction
   • D.hydraulic piping flexibility
   Show answer

   B. atmosphere as heat

   Q802, Electrician

10. A water jacket is placed around the exhaust manifolds of propulsion diesel engines to __________.

    • A.Reduce heat radiation to the engine room
    • B.Aid in preventing turbocharger overheating
    • C.Condense and drain moisture from exhaust gases
    • D.Dampen exhaust gas pulsations in the manifold
    Show answer

    A. Reduce heat radiation to the engine room

    Q610, Assistant Engineer Limited: Motor Plants

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.