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

Question 1

What is the result of the vortex ring state?

Accepted Answer

The sink rate increases uncontrollably

Answer

The helicopter is more stable

Answer

The helicopter loses power

Answer

The rotor RPM increases

Question 2

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 3

During hover flight, the induced airflow velocity...

Accepted Answer

Increases further having passed the rotor.

Answer

Is equal above and below the rotor.

Answer

Remains constant after having passed the rotor.

Answer

Decreases after having passed the rotor.

Question 4

A delta-three hinge is used to allow...

Accepted Answer

For a decreased pitch angle at an upwards flapping blade.

Answer

The advancing blade to flap up about the hinge.

Answer

The advancing blade to lead about the hinge.

Answer

The advancing blade to drag about the hinge.

Question 5

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 6

What is caused by an increase of stability in a helicopter?

Accepted Answer

An increase of general flight safety

Answer

An optimization of the maximum helicopter mass

Answer

An enhance of control under negative load factors

Answer

A decrease of the required control forces

Question 7

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 8

After entering an autorotation a large helicopter mass leads to...

Accepted Answer

A rapid build-up of the rotor RPM.

Answer

A rapid collapse of the rotor RPM.

Answer

A large change in center of gravity.

Answer

A small rate of descent in a vertical autorotation.

Question 9

What kind of drag is caused by a lift-producing aerofoil?

Accepted Answer

Induced drag

Answer

Parasite drag

Answer

Frictional drag

Answer

Interference drag

Question 10

The rotor thrust is...

Accepted Answer

Perpendicular to the tip path plane.

Answer

Opposite to the rotation of the rotor blade element

Answer

Parallel with the main rotor shaft.

Answer

Perpendicular to the hub plane.

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