SAR-66 Module 16 Practice Questions - CAAS SAR-66 AML Module 16 - Piston Engine (MCQ) Exam - SAR-66 Module 16 Practice Questions - CAAS SAR-66 AML Module 16

Question 1

In a 4-stroke aircraft piston engine operating on the Otto cycle, how many crankshaft revolutions occur during one complete 4-stroke cycle per cylinder?

Two revolutions (720°) One revolution (360°) Four revolutions (1440°) Half a revolution (180°)

Correct Answer:

Two revolutions (720°)

Question 2

What is 'valve overlap' in an aircraft 4-stroke piston engine, and what benefit does it provide at high RPM?

The angular period near Top Dead Center (TDC) when both intake and exhaust valves are open simultaneously, utilizing exhaust gas inertia to draw in fresh intake charge The time when both intake and exhaust valves are completely closed during the power stroke The period when the intake valve is held open during the compression stroke to reduce starter torque The period when exhaust gas flows back into the carburetor

Correct Answer:

The angular period near Top Dead Center (TDC) when both intake and exhaust valves are open simultaneously, utilizing exhaust gas inertia to draw in fresh intake charge

Question 3

Calculate the Indicated Horsepower (IHP) of a 6-cylinder 4-stroke engine operating with an Indicated Mean Effective Pressure (IMEP) P of 150 psi, stroke length L of 0.25 ft, cylinder bore area A of 20 sq in, and crankshaft speed N of 2400 RPM.

163.6 IHP 327.3 IHP 81.8 IHP 654.5 IHP

Correct Answer:

163.6 IHP

Question 4

If a piston engine develops an Indicated Horsepower (IHP) of 300 HP and a Brake Horsepower (BHP) of 255 HP, what are its Friction Horsepower (FHP) and Mechanical Efficiency?

FHP = 45 HP, Mechanical Efficiency = 85% FHP = 55 HP, Mechanical Efficiency = 80% FHP = 45 HP, Mechanical Efficiency = 75% FHP = 555 HP, Mechanical Efficiency = 95%

Correct Answer:

FHP = 45 HP, Mechanical Efficiency = 85%

Question 5

What is 'detonation' in an aircraft piston engine, and what causes it?

Uncontrolled, instantaneous explosive burning of the unburned fuel-air mixture ('end gas') caused by excessively high cylinder temperature and pressure Ignition of the fuel-air mixture prior to the timed spark plug discharge Slow, incomplete burning of fuel inside the exhaust muffler Failure of the spark plug to fire on one cylinder

Correct Answer:

Uncontrolled, instantaneous explosive burning of the unburned fuel-air mixture ('end gas') caused by excessively high cylinder temperature and pressure

Question 1

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Prepare with the SAR-66 Module 16 Practice Questions - CAAS SAR-66 AML Module 16 - Piston Engine (MCQ) Exam practice quiz. This question bank includes 100 questions covering aircraft, engine, piston, cylinder, and valve. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SAR-66 Module 16 Practice Questions - CAAS SAR-66 AML Module 16 - Piston Engine (MCQ) Exam

This practice set contains 100 questions from the matching question bank and focuses on aircraft, engine, piston, cylinder, and valve. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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SAR-66 Module 16 Practice Questions - CAAS SAR-66 AML Module 16 - Piston Engine (MCQ) Exam

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