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USCG Gas Turbine Plants Practice Test

320 Gas Turbine Plants questions from 6 of the National Maritime Center’s published sample exams, each with the NMC’s answer key. Questions that need an illustration, a chart or a reference book are left out.

26 of them come with the closest regulation or reference section, shown with the answer.

Take a quiz of 10 drawn at random, or read the 10 sample questions and answers below.

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10 sample Gas Turbine Plants questions with answers

The same 10 on every visit. A related section is the closest match RegKnot found in the regulations and references; it is not part of the NMC’s answer key.

  1. Question 1 · Chief Engineer – Limited

    In general, diesel engine waste heat boiler construction is usually of the _________.

    • A.cyclone furnace boiler type
    • B.critical circulation boiler type
    • C.water-tube type (correct answer)
    • D.dry back boiler type

    Answer: C. water-tube type

    Related regulation: USCG MSM 16000.71 Ch.1 — Marine Safety — Domestic Inspection Programs — Ch.1 INSPECTION OF VESSELS FOR CERTIFICATION

  2. Question 2 · Third Assistant Engineer

    The auxiliary steam boiler on your vessel is equipped with a gauge glass for local level indication. On which of the following auxiliary boiler types would this gauge glass be attached to a flash chamber also known as a steam accumulator or steam separator?

    • A.Fire-tube steam boiler
    • B.Water-tube forced-circulation steam boiler (correct answer)
    • C.Electric steam boiler
    • D.Water-tube natural-circulation steam boiler

    Answer: B. Water-tube forced-circulation steam boiler

    Related regulation: 46 CFR 52.01-110 ↗ — Water-level indicators, water columns, gauge-glass connections, gauge cocks, and pressure gauges (modifies PG-60)

  3. Question 3 · Chief Engineer – Limited

    Burner ignition failure in an automatically fired auxiliary boiler would be caused by __________.

    • A.a burned-out solenoid in the oil supply valve (correct answer)
    • B.high temperature excess air
    • C.incorrectly setting the hotwell dump valve
    • D.an incorrectly positioned burner snubber relay

    Answer: A. a burned-out solenoid in the oil supply valve

    Related regulation: NVIC 01-69 Encl.1 — Automated Main and Auxiliary Machinery — Enclosure (1)

  4. Question 4 · Assistant Engineer – Limited

    In the boiler steam and water system, pressure is highest in the __________.

    • A.dry pipe
    • B.steam stop
    • C.feed line (correct answer)
    • D.mud drum

    Answer: C. feed line

    Related regulation: 46 CFR 56.50-30 ↗ — Boiler feed piping

  5. Question 5 · Chief Engineer – Limited

    Your first step in response to a gas turbine engine high lube oil sump temperature alarm would be which of the following?

    • A.De-couple the engine from the main reduction gear.
    • B.Check the oil pressure to the sump.
    • C.Check the oil filter differential pressure.
    • D.Reduce engine speed. (correct answer)

    Answer: D. Reduce engine speed.

    Related regulation: USCG SA 07-26 — USCG SA 07-26 — Coast Guard Safety Alert: Know Your Boat: Responding to an Engine High Temperature Alarm (2026-06-02)

  6. Question 6 · Assistant Engineer – Limited

    Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

    • A.The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the closed position.
    • B.The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position. (correct answer)
    • C.The damper is moved to the closed position for a given number of seconds and then moved to the low fire position.
    • D.The damper in the uptakes is moved to the wide-open position for a given number of seconds and then moved to the low firing rate position.

    Answer: B. The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position.

    Related regulation: 46 CFR 63.25-1 ↗ — Small automatic auxiliary boilers

  7. Question 7 · First Assistant Engineer

    On a gas turbine powered vessel, what is the last step after an off-line water wash?

    • A.Start the engine to dry it out. (correct answer)
    • B.Open the variable stator vanes.
    • C.Secure the starting system.
    • D.Release the gas generator brake.

    Answer: A. Start the engine to dry it out.

    Related regulation: NVIC 04-17 Encl.2 — CH-5 to Guidelines on Qualification for National and STCW Endorsements for Service as Assistant Engineer and Officer in Charge of an Engineering Watch on Offshore Supply Vessels, NVIC 04-17, COMDTPUB 16721 — Enclosure (2)

  8. Question 8 · Third Assistant Engineer

    Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications?

    • A.Multi-screw ships
    • B.Generators (correct answer)
    • C.Single-screw ships
    • D.Auxiliary power units

    Answer: B. Generators

    Related regulation: 46 CFR 111.10-4 ↗ — Power requirements, generating sources

  9. Question 9 · Assistant Engineer – Limited

    Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications?

    • A.Single-screw ships
    • B.Multi-screw ships
    • C.Auxiliary power units
    • D.Generators (correct answer)

    Answer: D. Generators

    Related regulation: 46 CFR 111.10-4 ↗ — Power requirements, generating sources

  10. Question 10 · DDE – 1000/4000 HP

    The bleed air surge relief valve differs from a normal relief valve in which of the following ways?

    • A.Gradually opens at a specified lift pressure and remains open until the pressure drops to a specified preset pressure.
    • B.Opens completely at a specified lift pressure and closes immediately as soon as the pressure begins to drop.
    • C.Opens completely at a specified lift pressure and remains open until the pressure drops to a specified preset pressure. (correct answer)
    • D.Gradually opens at a specified lift pressure and closes immediately as soon as the pressure begins to drop.

    Answer: C. Opens completely at a specified lift pressure and remains open until the pressure drops to a specified preset pressure.

    Related regulation: 46 CFR 162.018-5 ↗ — Blow-down adjustment and popping tolerance

Exams these questions come from

Choose one when you start the quiz. A question can appear in more than one exam, so these add up to more than 320.

  • Assistant Engineer – Limited64 questions
  • DDE – Unlimited HP60 questions
  • Chief Engineer – Limited59 questions
  • First Assistant Engineer58 questions
  • Third Assistant Engineer55 questions
  • DDE – 1000/4000 HP40 questions

More USCG practice tests

The questions and answer keys are from the U.S. Coast Guard National Maritime Center’s published sample exams. RegKnot is not affiliated with the U.S. Coast Guard or the National Maritime Center. A practice score does not predict your exam result; check the NMC for current exam requirements.