FREE CPL Aircraft Systems and Aerodynamics Questions and Answers

Question 1

In a conventional twin-engine aircraft with clockwise rotating propellers, which engine is considered the 'critical engine' and why?

Accepted Answer

The left engine, because P-factor and torque from the right engine create the most adverse yawing and rolling moments.

Answer

The right engine, because its failure results in a greater loss of rudder effectiveness due to spiraling slipstream.

Answer

Neither engine is critical if the aircraft is equipped with counter-rotating propellers.

Answer

The inboard engine on a four-engine aircraft, because its thrust line is closest to the fuselage.

Question 2

A pilot is flying an aircraft with a constant-speed propeller. During a descent with power reduced, the pilot notices the RPM is increasing. To maintain the desired RPM, the propeller governor will automatically:

Accepted Answer

increase the blade pitch angle, which increases aerodynamic load and slows the propeller.

Answer

decrease the blade pitch angle, allowing the propeller to spin faster.

Answer

send oil pressure to the feathering mechanism to prevent an overspeed condition.

Answer

adjust the wastegate to reduce engine manifold pressure.

Question 3

What is the primary function of a hydraulic accumulator in an aircraft landing gear system?

Accepted Answer

To store hydraulic fluid under pressure to dampen pressure fluctuations and provide emergency pressure.

Answer

To mix hydraulic fluid with compressed nitrogen for better lubrication.

Answer

To cool the hydraulic fluid after repeated gear extensions and retractions.

Answer

To act as the main reservoir for the aircraft's entire hydraulic system.

Question 4

During a level, coordinated turn, the load factor on an aircraft will:

Accepted Answer

increase as the angle of bank increases.

Answer

remain at 1 G, regardless of the bank angle.

Answer

decrease as the angle of bank increases.

Answer

be determined solely by the airspeed, not the bank angle.

Question 5

A pilot of a large, swept-wing aircraft encounters an uncommanded, coupled oscillation of rolling and yawing. This aerodynamic characteristic is known as:

Accepted Answer

Dutch roll.

Answer

a phugoid oscillation.

Answer

spiral instability.

Answer

adverse yaw.

Question 6

Which of the following is a significant aerodynamic benefit of retracting the landing gear after takeoff?

Accepted Answer

A significant reduction in parasite drag, improving climb performance and cruise efficiency.

Answer

A forward shift in the center of gravity, increasing longitudinal stability.

Answer

An increase in the effectiveness of the rudder for better directional control.

Answer

A decrease in induced drag, allowing for a steeper angle of climb.