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

Question 1

The effective airflow velocity of a rotor blade element varies with the distance from the rotor shaft axis, because the...

Accepted Answer

Peripheral speed increases if the displacement to the rotor blade tip decreases-

Answer

Helicopter airframe disturbs the airflow.

Answer

Tangential force and airflow reversal vary.

Answer

Drag force in direction of the rotaion axis is increased.

Question 2

The rotor blade shape takes effect on the...

Accepted Answer

Lift distribution.

Answer

Rotor head used.

Answer

Noch sensitivity.

Answer

Structural take-off mass.

Question 3

What is the purpose of the vertical stabilizer?

Accepted Answer

Improvement of directional stability

Answer

Adjustment of longitudinal stability

Answer

Compensation of tail rotor stability

Answer

Reduction of manoeuvre stability

Question 4

Why is a helicopter's climb initially accelerated after an increase of the pitch angle?

Accepted Answer

The inertia of the air increases the effective angle of attack temporarily until an additional component of the climb rate reduces the effective angle of attack again

Answer

The larger pitch angle causes a decrease and a compression of the airflow until the climb rate corresponds to the induced velocity through the main rotor disc

Answer

The initially high airflow increases the rotor thrust until the lower air density reduces the rotor thrust again

Answer

The conversion of energetic air into kinetic rotor energy decreases continuously with increasing density altitude

Question 5

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

Question 6

The pitch angle of a tail rotor blade is changed...

Accepted Answer

Collectively.

Answer

Cyclically.

Answer

Symmetrically.

Answer

Asymmetrically.

Question 7

The helicopter's stability is increased by...

Accepted Answer

Attaching a stabilizer.

Answer

Reducing the rotor RPM.

Answer

Pivoting the drag hinge.

Answer

Decreasing the rotor mass.

Question 8

During an autorotation a helicopter accelerates from 60 to 90 knots without further corrections. The rotor RPM will...

Accepted Answer

Decrease.

Answer

Remain constant.

Answer

Vary.

Answer

Increase.

Question 9

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 10

The rotor RPM is kept constant in the helicopter by the engine RPM. It can be influenced by the...

Accepted Answer

Throttle and the governor.

Answer

Cyclic stick.

Answer

Starter and the impulse coupling.

Answer

Collective.

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