CPL Aircraft Systems and Aerodynamics 2

Question 1

What is the primary purpose of a fuel injector in a reciprocating aircraft engine compared to a carburetor?

Accepted Answer

It delivers fuel directly to each cylinder intake port, eliminating carburetor icing

Answer

It mixes fuel with oil before combustion

Answer

It increases the fuel octane rating before delivery

Answer

It recirculates unburned fuel back to the tank

Question 2

In a hydraulic system, what is the function of an accumulator?

Accepted Answer

To store pressurized fluid and dampen pressure surges

Answer

To filter hydraulic fluid of contaminants

Answer

To convert hydraulic pressure to electrical signals

Answer

To regulate the direction of hydraulic flow

Question 3

Which type of drag increases as airspeed decreases during slow flight?

Accepted Answer

Induced drag

Answer

Parasite drag

Answer

Wave drag

Answer

Form drag

Question 4

What happens to the manifold pressure of a naturally aspirated engine as altitude increases (throttle fixed)?

Accepted Answer

It decreases as ambient air density and pressure drop

Answer

It increases due to reduced ambient pressure

Answer

It remains constant due to the throttle position

Answer

It fluctuates unpredictably with temperature changes

Question 5

What is 'Mach tuck' as it applies to high-speed aircraft?

Accepted Answer

A nose-down pitching moment caused by aft movement of the center of pressure at high Mach numbers

Answer

A nose-up pitching moment caused by compressibility effects near the critical Mach number

Answer

Wing flutter occurring at exactly Mach 1.0

Answer

Rudder buffet caused by supersonic airflow over the vertical stabilizer

Question 6

In a multi-engine aircraft with asymmetric thrust, what is the 'critical engine'?

Accepted Answer

The engine whose failure creates the greatest adverse yaw and handling difficulty

Answer

The engine with the highest thrust output

Answer

The engine closest to the aircraft centerline

Answer

The engine that powers the primary hydraulic pump

Question 7

What is the purpose of 'intercoolers' in turbocharged aircraft engines?

Accepted Answer

To reduce the temperature of compressed intake air after it exits the turbocharger

Answer

To cool engine oil before it enters the main gallery

Answer

To maintain cylinder head temperature within limits

Answer

To pre-heat fuel before injection