Chapter 2 - Hovering and Horizontal Movement

Question 1

When a helicopter is hovering ¼ disc diameter from flat ground, which of the following will take place?
A. Airflow will form convergent duct effect to increased air pressure above the disc area.
B. Induced flow through the disc will increase causing higher angle of attack.
C. Airflow will form divergent duct effect to increase air pressure below the disc area.
D. Induced flow through the disc will decrease causing lower angle of attack.

Answer 1

C

Question 2

When a helicopter is on the ground and the pilot raises the collective lever to cause the total rotor thrust to exceed the all up weight, the initial reaction of the helicopter is to:
A. Move vertically upwards at constant rate of climb.
B. Accelerate vertically upwards only if the pilot increases throttle power.
C. Accelerate vertically upwards.
D. Move vertically upwards only if the pilot increases the tail rotor thrust.

Answer 2

C

Question 3

When a helicopter is hovering about 3 time the disc diameter from the ground, it is said to be:
A.	Hovering Outside Ground Effect(OGE)
B.	Hovering On Gyroscopic Effect(OGE)
C.	Hovering Inside Ground Effect(IGE)
D.	Hovering In General Environment(IGE)

Answer 3

A

Question 4

Based on the principle of conservation of angular momentum the rotor blade would speed up when:
A. Its CG radius relative to the shaft axis is increasing.
B. Its CG radius relative to the shaft axis is decreasing.
C. Its rotor drag is decreasing.
D. The engine power is increasing.

Answer 4

B

Question 5

With reference to fig 1 below, the pilot has moved the cyclic control to effect cyclic pitch change as shown. Looking from the rotor head, which direction will the helicopter fly?
A.	Towards direction C
B.	Towards direction D
C.	Towards direction A
D.	Towards direction B

Answer 5

D

Question 6

With reference to fig 1 below, the pilot has moved the cyclic control to effect cyclic pitch change as shown. Which blade would be at the highest position?
A.	A
B.	B
C.	C
D.	D

Answer 6

D

Question 7

The swash plate is described as a control orbit because it represents:
A. The direction in which the main rotor shaft is pointing.
B. The amount of total rotor thrust produced by the rotor disc.
C. The plane on which the pitch operating arms are rotating.
D. The amount of induced flow the rotor disc is experiencing.

Answer 7

C

Question 8

Which of the following statements is correct about helicopter rates of descent?
A. During low rates of descent, the angle of attack of rotor blades will decrease.
B. Descending at low rates of descent is more dangerous than at high rates of descent.
C. During low rates of descent, the angle of attack of rotor blades will increase.
D. There is no difference in aerodynamics between a low rate of descent and high rate of descent.

Answer 8

C

Question 9

Recirculation will increase when helicopter is hovering:
A. In open space over a smooth flat surface.
B. At high altitude in strong wind.
C. At high altitude in still air.
D. Close to ground and near an obstruction which prevents air from flowing evenly away.

Answer 9

D

Question 10

To initiate a cyclic pitch change, the pilot must:
A. Move the cyclic control to move the swash plate vertically up.
B. Move the cyclic control to tilt the swash plate.
C. Hold the cyclic control in neutral position while the swashplate is tilted by collective control.
D. Hold the cyclic control in neutral position while the swashplate is moved vertically up by collective control.

Answer 10

B

Question 11

When a rotor blade is flapping to equality, it is flapping to:
A.	Maintain rotor thrust.
B.	Increase rotor thrust.
C.	Decrease rotor thrust
D.	Maintain rotor RPM.

Answer 11

A

Question 12

When a helicopter’s rate of climb increases, it will cause:
A. Increasing induced flow but decreasing total rotor thrust.
B. Increasing induced flow and increasing total rotor thrust.
C. Decreasing induced flow but increasing total rotor thrust.
D. Decreasing induced flow and decreasing total rotor thrust.

Answer 12

A

Question 13

Phase lag is overcome by arranging for the blade to receive the maximum alteration in cyclic pitch change:
A. 90° after the blade is at the highest and lowest positions.
B. 180° before the blade is at the highest and lowest positons.
C. 90° before the blade is at the highest and lowest positions.
D. 180° after the blade is at the highest and lowest positions.

Answer 13

C

Question 14

Recirculation is significant when a helicopter is hovering ___ and will cause ___.
A. Close to ground; increase in rotor thrust.
B. At high altitude; reduction in rotor thrust.
C. At high altitude; increase in rotor thrust.
D. Close to ground; reduction in rotor thrust.

Answer 14

D

Question 15

The angular distance that the Pitch Operating Arm is positioned on the control orbit in advance of the blade is known as:
A.	Phase lag angle
B.	Advance angle
C.	Pitch operating arm angle
D.	Control orbit angle

Answer 15

B