AMT Powerplant Theory and Maintenance 2

Question 1

What is the purpose of the intercooler in a turbocharged reciprocating engine?

Accepted Answer

To reduce the temperature of compressed induction air

Answer

An intercooler reduces the temperature of induction air after compression by the turbocharger, increasing air density for better fuel-air mixture.

Question 2

A reciprocating engine is said to be 'detonating' when:

Accepted Answer

The fuel-air mixture explodes instantaneously rather than burning progressively

Answer

Detonation occurs when the fuel-air mixture explodes instantaneously instead of burning progressively, causing severe pressure spikes and potential engine damage.

Question 3

Which turbine engine component is most susceptible to thermal fatigue and oxidation?

Accepted Answer

High-pressure turbine blades

Answer

High-pressure turbine blades operate at the highest temperatures in the engine and are therefore most susceptible to thermal fatigue and oxidation.

Question 4

When performing a differential compression test on a reciprocating engine cylinder, a reading of 72/80 psi is obtained. What does this indicate?

Accepted Answer

The cylinder is serviceable; the leakage is within acceptable limits

Answer

A 72/80 reading (90% efficiency) is within the typically accepted limit of 75–80% of regulated pressure, indicating the cylinder is serviceable.

Question 5

In a gas turbine engine, the primary function of the diffuser section is to:

Accepted Answer

Convert air velocity into static pressure

Answer

The diffuser section converts high-velocity compressor discharge air into high-static-pressure, lower-velocity airflow before combustion.

(AMT) Aviation Maintenance Technician Practice Test

(AMT) Aviation Maintenance Technician Practice Test

AMT Powerplant Theory and Maintenance 2