Principles of Flight (Helicopter) - PPL(H) - Private Pilot License

Question 1

What shall be considered before terminating a turn in an autorotation?

Accepted Answer

The pitch angle must be decreased by using the collective pitch lever again

Answer

The Coriolis force causes an increase in the main rotor rpm

Answer

The decreasing gravity relieves the main rotor and the helicopter cabin

Answer

The flight velocity shall be increased to obtain all the kinetic energy

Question 2

Why does a stall begin on the retreating rotor blade at high cruise speeds?

Accepted Answer

The large pitch angle and relatively low peripheral speed cause a large effective angle of attack

Answer

The airflow reaches subsonic speed and causes an increase of the induced drag

Answer

The small pitch angle and a relatively low peripheral speed cause a small effective angle of attack

Answer

The airflow reaches supersonic speed and causes an increase of the parasite drag

Question 3

The neutral point is a point where...

Accepted Answer

The torque at the chord line remains constant for changing angles of attack.

Answer

The aerodynamic forces act torque-free.

Answer

The imaginary axes of a helicopter meet each other

Answer

The entire helicopter mass can be assumed to attack.

Question 4

A helicopter with a rotor turning in an anti-clockwise direction seen from above, hovers sideways to the right. What is the azimuth angle where the main rotor blades have the biggest pitch angle?

Accepted Answer

180°

Answer

270°

Answer

90°

Answer

0°

Question 5

Which movement is caused by the Coriolis effect on the advancing rotor blade?

Accepted Answer

Drag movement forwards

Answer

Mass movement outwards

Answer

Tilt movement backwards

Answer

Flapping downwards

Question 6

What happens to thrust and tangential force if the rotor RPM decreases by about 10 % in cruise flight?

Accepted Answer

The thrust and the tangential force decrease

Answer

The thrust and the tangential force increase

Answer

The thrust decreases and the tangential force remains constant

Answer

The thrust remains constant and the tangential force increases

Question 7

Which statement about the required force to change the pitch angle is correct?

Accepted Answer

It must be greater than the tangential force

Answer

It is the smallest by using an advance angle of 90°

Answer

It is the smallest by using a delta-three-hinge

Answer

It must be greater than the rotor disc loading

Question 8

What force affects the braking torque of the rotor in cruise?

Accepted Answer

Inclined rearward tangential force

Answer

Inclined forward lift

Answer

Upward directional rotor thrust

Answer

Inclined forward drag force

Question 9

Which option describes the term "asymmetric airflow"?

Accepted Answer

During cruise flight the advancing rotor blade has more airflow than the retreating rotor blade

Answer

The displacement of the driving forces to the advancing rotor blade in a vertical autorotation

Answer

The difference in required performance during hover in and out of ground effect

Answer

The greater lift in the outer region of the rotor as opposed to the inner region

Question 10

What is the risk arising in a vertical autorotation with a subsequent increase in airspeed prior to the landing?

Accepted Answer

Misjudgement when increasing the airspeed

Answer

High rotor RPM

Answer

Vortex ring state

Answer

Loss of the tail rotor efficiency

Quiz Principles of Flight (Helicopter) - PPL(H) - Private Pilot License

Test 10 Questions PPL(H) - Private Pilot License - Principles of Flight (Helicopter), no time limit