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

Fuel injection delivers fuel directly to each cylinder's intake port, eliminating the venturi and float chamber that make carburetors susceptible to icing.

Question 2

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

Accepted Answer

To store pressurized fluid and dampen pressure surges

Answer

An accumulator stores pressurized hydraulic fluid and absorbs pressure surges, providing a reserve of pressure when demand exceeds pump output.

Question 3

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

Accepted Answer

Induced drag

Answer

Induced drag increases as airspeed decreases because the wing must operate at a higher angle of attack to generate the required lift, strengthening wingtip vortices.

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

With a fixed throttle, manifold pressure decreases with altitude because the ambient air pressure supplying the intake is lower, reducing the pressure available to the engine.

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

Mach tuck is a nose-down pitching tendency that occurs as the aircraft approaches its critical Mach number, caused by the aft shift of the center of pressure as the shock wave forms.

(CPL) Commercial Pilot Licence Practice Test

(CPL) Commercial Pilot Licence Practice Test

CPL Aircraft Systems and Aerodynamics 2