CPL Aerodynamics and Aircraft Systems 3

Question 1

What is the primary purpose of a hydraulic accumulator in an aircraft hydraulic system?

Accepted Answer

To store pressurized fluid for emergency use and dampen pressure fluctuations

Answer

A hydraulic accumulator stores pressurized fluid under a nitrogen gas charge to provide emergency pressure, dampen pump pressure spikes, and supplement pump output during peak demand.

Question 2

In a typical aircraft fuel system, the crossfeed function allows:

Accepted Answer

Any engine to draw fuel from any tank regardless of normal feed configuration

Answer

Crossfeed permits an engine to be fed from a tank on the opposite side of the aircraft, enabling fuel balancing and engine operation in the event of a fuel pump failure.

Question 3

Aircraft bleed air, tapped from jet engine compressor stages, is primarily used for:

Accepted Answer

Cabin pressurization, air conditioning, and wing anti-icing

Answer

Bleed air extracted from the compressor provides the main source of airflow for cabin pressurization, environmental control, and thermal anti-icing of wing leading edges and engine inlets.

Question 4

A constant-speed propeller governor maintains a selected RPM by automatically adjusting:

Accepted Answer

Propeller blade pitch to balance engine torque and aerodynamic load

Answer

The governor senses propeller RPM and adjusts blade pitch (increasing pitch in light load, decreasing in heavy load) to keep RPM constant as power demand changes.

Question 5

The pressurization differential limit (max differential pressure) on a transport aircraft is primarily set by:

Accepted Answer

Structural limits of the fuselage pressure vessel

Answer

The maximum cabin differential pressure is determined by the structural design limit of the fuselage, which must withstand repeated pressurization cycles throughout the aircraft's service life.

(CPL) Commercial Pilot Licence Practice Test

(CPL) Commercial Pilot Licence Practice Test

CPL Aerodynamics and Aircraft Systems 3