Chief Engineer Limited Practice Test (CEL01)

Running the engine department: management and general subjects, motor plants, safety and pollution rules. Coast Guard exam code CEL01.

208 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. Why can CFC or HCFC refrigerants leaking into a confined space or in limited surroundings cause suffocation?

   • A.Refrigerants obnoxious odor prevents breathing.
   • B.Refrigerants contain an acidic substance.
   • C.Refrigerants are heavier than air and displace oxygen.
   • D.Refrigerants lighter than air will rise.
   Show answer

   C. Refrigerants are heavier than air and displace oxygen.

   Q803, Refrigerating Engineer

2. Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open __________.

   • A.earlier and have less lift
   • B.earlier and remain open longer
   • C.later and have greater lift
   • D.later and have less duration
   Show answer

   B. earlier and remain open longer

   Q602, Chief Engineer Limited: Motor Plants

3. It is necessary to cool the bulkheads and decks surrounding a compartment where there is a fire in order to __________.

   • A.form a dense coating of smothering steam
   • B.prevent the fire from spreading by the conduction of heat
   • C.cool the metal below its ignition temperature
   • D.prevent oxygen from reaching the flames
   Show answer

   B. prevent the fire from spreading by the conduction of heat

   Q805, Oiler, Part II

4. If you attempt to tighten a leaking hydraulic fitting with pressure on the system, you will __________.

   • A.cause the system to vibrate
   • B.be successful every time
   • C.find that the pressure will prevent the components from being tightened
   • D.dislodge any scale in the tubing, and it will damage the system
   Show answer

   C. find that the pressure will prevent the components from being tightened

   Q601, Chief Engineer Limited: General Subjects

5. During main engine performance testing it is noticed that the firing pressure of one cylinder is higher than the average, but cylinder compression pressure is normal. Which of the following would most likely be the cause?

   • A.Early fuel injection
   • B.Worn piston rings
   • C.Late fuel injection
   • D.High engine load
   Show answer

   A. Early fuel injection

   Q602, Chief Engineer Limited: Motor Plants

6. High concentrations of hydrogen sulfide gas are most dangerous to personnel because they can __________.

   • A.cause eye inflammation
   • B.cause involuntary skeletal muscle contractions
   • C.paralyze your breathing system
   • D.cause dizziness
   Show answer

   C. paralyze your breathing system

   Q806, Fireman / Watertender

7. When new piping sections have been fabricated for installation in a hydraulic system, prior to installation the piping should be __________.

   • A.descaled by using a pickling solution
   • B.hydrostatically tested to 100% of maximum working pressure
   • C.cleaned using a water-based detergent
   • D.all of the above
   Show answer

   A. descaled by using a pickling solution

   Q601, Chief Engineer Limited: General Subjects

8. All modern medium and slow speed diesel engines have components assembled via bolts that are tensioned hydraulically, both for removal and reassembly. When using such hydraulic devices, to what metallurgical state are you subjecting such bolts?

   • A.When tightened, they are below the metal's elastic limit.
   • B.Initially above the metal's elastic limit.
   • C.When tightened, they are at the metal's elastic limit.
   • D.When tightened, they are above the metal's elastic limit.
   Show answer

   A. When tightened, they are below the metal's elastic limit.

   Q602, Chief Engineer Limited: Motor Plants

9. A low velocity fog applicator is held in an all-purpose nozzle by a bayonet joint. The applicator is prevented from rotating in the joint by __________.

   • A.a spring-loaded catch
   • B.water pressure
   • C.a keeper screw
   • D.a locknut
   Show answer

   A. a spring-loaded catch

   Q806, Fireman / Watertender

10. A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?

    • A.A partial restriction in the return line has developed.
    • B.Operating oil temperature is determined to be below normal.
    • C.A vacuum condition has developed in the reservoir.
    • D.Abnormal pressurization is occurring in the reservoir.
    Show answer

    C. A vacuum condition has developed in the reservoir.

    Q601, Chief Engineer Limited: General Subjects

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.