Mid Term Exam

Question 1

What happens when both magnetos fail in cruise?

Answer 1

Engine failure

Question 2

On a four-stroke aircraft, when are both valves closed?

Answer 2

During the compression stroke

Question 3

Why are turbo engines less efficient at low altitude?

Answer 3

Because the air is already dense on the ground, turbine engines need to use more fuel to get the correct fuel-to-air ratio

Question 4

What is a boxer engine?

Answer 4

A horizontally opposed engine

Question 5

What is the purpose of a push rod?

Answer 5

It transfers motion of the camshaft to the rocker arm

Question 6

How is the stroke of the piston measured?

Answer 6

TDC-BDC (top dead center minus bottom dead center)

Question 7

What does “high bypass” and “low bypass” refer to?

Answer 7

The ratio of air that passes through the turbine

Question 8

What type of compressors do turbojet engines use?

Answer 8

They generally use centrifugal AND axial flow compressors. Though they can use axial flow exclusively

Question 9

What do N1 and N2 measure?

Answer 9

Different spools

Question 10

What type of oil distribution system does the C172 have?

Answer 10

A wet sump

Question 11

In a high-output engine, you have to slow down the propeller while maintaining max engine power. How could you do that?

Answer 11

Usually through a governor, but it can also be done with a gearbox