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Free FAA Mechanic Powerplant Practice Test Online

Official exam: FAA Aviation Mechanic Powerplant (AMP)

Take a free FAA Mechanic Powerplant practice test online: a full 100-question paper with every answer explained, no sign-up, scored by topic. The full 300-question bank and the timed simulator are $14.99 for 30 days.

First published: September 2, 2026Bank updated: September 2, 2026Published by CertQuestUSA · review process
TL;DR

FAA Aviation Mechanic Powerplant (AMP): a 300-question practice bank for the real FAA Aviation Certification standard, 4 full papers of 100 questions each with no repeats, every question written to the regulation it comes from.

Where these questions come from

Every question in this bank cites a source -- primarily FAA-AMT-POWERPLANT-V2 -- Chapter (73%) and FAA-AMT-POWERPLANT-V1 -- Chapter (25%) of this exam's citations.

Take a full practice test free. 100 real questions built to the exam's domain weights, every answer explained, no sign-up required, with a domain-by-domain score at the end.
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4
full papers, no repeats
100
questions per paper
300
questions in the bank
What this exam covers
5 real sample questions
An EPR system senses 15.0 psia at the inlet and 27.0 psia at turbine discharge. What EPR should it display before correction factors?
A. 0.56
B. 1.80
C. 12.0
D. 42.0
Show answer and reasoning

Correct answer: B. 1.80

EPR is discharge total pressure divided by inlet total pressure: 27.0 ÷ 15.0 = 1.80.

  • A: Zero point five six reverses the pressure ratio.
  • C: Twelve is the pressure difference rather than the required ratio.
  • D: Forty-two is the sum of pressures rather than their ratio.
Source: FAA-AMT-POWERPLANT-V2 -- Chapter 10, Engine Pressure Ratio Indicating Systems
What is the purpose of generator overcurrent protection?
A. Limit or disconnect a source when current exceeds safe values
B. Increase wire temperature to improve conductivity
C. Keep a fault energized until it becomes visible
D. Replace voltage regulation under all conditions
Show answer and reasoning

Correct answer: A. Limit or disconnect a source when current exceeds safe values

Overcurrent protection prevents excessive current from damaging the generator, wiring, contacts, and bus. Depending on design, it trips a relay, breaker, or control function.

  • B: Heating conductors wastes energy and can damage insulation.
  • C: Protective devices act to remove hazardous fault energy rather than sustain it.
  • D: Voltage regulation and overcurrent protection address different abnormal conditions.
Source: FAA-AMT-POWERPLANT-V2 -- Chapter 11, Generator Control and Protective Devices
A 28-volt DC motor draws 14 amperes. Approximately how much electrical power does it consume?
A. 2 W
B. 392 W
C. 42 W
D. 1,960 W
Show answer and reasoning

Correct answer: B. 392 W

DC electrical power equals voltage multiplied by current: 28 V × 14 A = 392 watts.

  • A: Two watts results from dividing current by voltage and has incorrect application here.
  • C: Forty-two watts is the sum rather than the product of voltage and current.
  • D: One thousand nine hundred sixty watts incorrectly multiplies the correct result by five.
Source: FAA-AMT-POWERPLANT-V2 -- Chapter 11, DC Electrical Power and Load Analysis
Which statement best describes brake mean effective pressure?
A. It is actual pressure measured continuously at the spark plug
B. It equals atmospheric pressure minus manifold pressure
C. It is the maximum instantaneous combustion pressure
D. Average pressure equivalent to the measured brake work
Show answer and reasoning

Correct answer: D. Average pressure equivalent to the measured brake work

BMEP is a calculated, uniform equivalent pressure related to engine torque or brake work and displacement. It is useful for comparing engine loading independent of displacement.

  • A: Cylinder pressure varies throughout the cycle and BMEP is not a direct continuous plug measurement.
  • B: The difference between atmospheric and manifold pressure is not the definition of BMEP.
  • C: Peak combustion pressure is instantaneous and differs from the calculated mean effective pressure.
Source: FAA-AMT-POWERPLANT-V1 -- Chapter 1, Engine Performance—Mean Effective Pressure
Why is excessive turbine blade-tip clearance undesirable?
A. It guarantees compressor surge at every power setting
B. Prevent turbine components from expanding into their designed hot-running clearances
C. It increases blade length automatically
D. More gas bypasses the blade tips and does no work
Show answer and reasoning

Correct answer: D. More gas bypasses the blade tips and does no work

Gas leaking through an excessive tip gap does not transfer its intended energy to the rotor blades. The resulting bypass reduces turbine efficiency and can degrade engine performance.

  • A: Excessive clearance can hurt performance but does not guarantee surge under every condition.
  • B: Clearance must accommodate expansion, but excessive clearance leaks gas past blade tips.
  • C: A clearance measurement does not itself alter physical blade length.
Source: FAA-AMT-POWERPLANT-V1 -- Chapter 2, Turbine Construction—Blade Tip Clearance
Real-world data for this exam
Aircraft Mechanics and Service Technicians: real median wageMay 2025$79,870/yr
Related reading
AMG vs. AMP vs. AMA: What's the Difference Between the FAA Mechanic Knowledge Tests? ›How Many Questions Are on the FAA Aviation Mechanic General (AMG) Test? ›

Frequently asked questions

Where can I take a free FAA Mechanic Powerplant practice test online?
Right here. CertQuestUSA's free FAA Mechanic Powerplant practice test online is a full 100-question practice paper built to the real exam's domain weights, with every answer explained, with no sign-up and no credit card, and shows your score by topic at the end. The full 300-question bank, with every answer explained and cited to the regulation it comes from, is $14.99 for a 30-day pass that never renews.
How many questions are on the CertQuestUSA FAA Aviation Mechanic Powerplant (AMP) practice test?
300 questions total, split into 4 full papers of 100 each with no repeats across papers.
What topics does the FAA Aviation Mechanic Powerplant (AMP) test cover?
13 domains, with the heaviest weight on Engine Electrical Systems (12%), Reciprocating Engines (12%), and Engine Fuel and Fuel Metering Systems (8%).
Where do CertQuestUSA's FAA Aviation Mechanic Powerplant (AMP) questions come from?
Primarily FAA-AMT-POWERPLANT-V2 -- Chapter (73%) and FAA-AMT-POWERPLANT-V1 -- Chapter (25%) of this bank's citations -- computed directly from this exam's own question sources, not a generic description.
Is there a free FAA Aviation Mechanic Powerplant (AMP) practice test?
Yes -- one full 100-question practice paper built to the exam's domain weights, free with no sign-up, with every answer explained and a domain-by-domain score at the end.
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