Free CPL Aircraft General Knowledge Questions and Answers

Question 1

The valves in a four-stroke engine open and close:

Accepted Answer

none of these

Answer

precisely on TDC and BDC

Answer

exactly 55° after TDC and BDC

Answer

exactly 15° after TDC and BDC

Question 2

Detonation in AVGAS is reduced by fuel companies adding certain compounds. Fuel then has an octane rating. Typical blue AVGAS is approximately:

Accepted Answer

100

Answer

130

Answer

120

Answer

110

Question 3

When fuel enters the combustion chamber from the carby it is:

Accepted Answer

flowing in as a gas

Answer

dribbling in as a fluid

Answer

running as a fluid

Answer

in a mixture of mainly liquid and some gas

Question 4

During a glide descent carb heat should be applied in the following manner.

Accepted Answer

Applied prior to commencing glide and removed just prior to re-applying power

Answer

Applied prior to commencing glide

Answer

Applied prior to commencing glide and removed after re-applying power

Answer

Applied after commencing glide and removed just after re-applying power

Question 5

The strength or power that acts on a piston during the power stroke is dependent on:

Accepted Answer

the air and fuel intake and the temperature it reaches after ignition

Answer

the air intake only

Answer

the air and fuel intake only

Answer

the amount of fuel intake only

Question 6

Detonation in aircraft engines is caused by:

Accepted Answer

fuel below the minimum recommended octane

Answer

using the wrong viscosity oil

Answer

fuel above the maximum recommended octane

Answer

fuel above the minimum recommended octane

Question 7

Gas-filled pipes routed around abnormal heat sources using linear pneumatic sensing systems are:

Accepted Answer

fire loops for detecting fires or heat in abnormal locations

Answer

heat loops for detecting fire in normal locations

Answer

heat loops for detecting heat ranges in normal locations

Answer

fire loops for detecting fires or heat near fuel sources

Question 8

A typical piston aircraft engine would have a thermal efficiency of approximately:

Accepted Answer

30%

Answer

10%

Answer

75%

Answer

50%

Question 9

The volumetric efficiency of an engine is best when:

Accepted Answer

cold ambient temp, low altitude, full throttle

Answer

cold ambient temp, high altitude, full throttle

Answer

cold ambient temp, low altitude, half throttle

Answer

hot ambient temp, high altitude, half throttle

Question 10

In an aircraft with CSU, applying carb heat with ice present will:

Accepted Answer

initially drop, then an increase in manifold pressure at a constant rpm

Answer

a drop in rpm

Answer

initially increases, then a drop in manifold pressure and fluctuating rpm

Answer

initially increases, then a drop in manifold pressure at a constant rpm