Mock Test (Part A)

Question 1

Which vehicles can be categorised as rotorcraft?

Answer 1

• Tiltrotor Aircrafts.
• Quadrotor Drone
  (basically anything with a rotor system).

Question 2

What is the aim of developing the flapping motion for rotorcraft?

Answer 2

Balance the rolling moment in forward flight.

Question 3

What is the most essential difference between the helicopter and the autogiro.

Answer 3

Whether the rotor is powered by the engine during the cruise flight.

Question 4

What type of rotorcrafts can fly forwardly without the flapping motion?

Answer 4

Tandem Configuration, Side-by-side Configuration and Quadrotor Drone.

Question 5

What can the figure of merit not exceed?

Answer 5

The figure of merit cannot exceed 100%.

Question 6

Which of the following statements related to the momentum theory is right
(a) It cannot be used in the vertical descent flight
(b) It can be used to evaluate the vortex-ring state’s induced velocity
(c) Its accuracy is still acceptable in the small speed vertical descending flight
(d) The hover equivalent induced velocity is always larger than the absolute value of the
induced velocity

Answer 6

(c) Its accuracy is still acceptable in the small speed vertical descending flight

Question 7

Which of the following statements related to the blade design is right
(a) The lift coefficients at different radius locations are the same.
(b) Incidence angles at different radius locations are the same.
(c) The blade control angle at the tip is always lower than that at the root.
(d) The thrust calculated by the blade element theory is related to the induced velocity.

Answer 7

(c) The blade control angle at the tip is always lower than that at the root
(d) The thrust calculated by the blade element theory is related to the induced velocity.

Question 8

When the rotorcraft is hover, which blade section is easier to be in the stall condition?

Answer 8

0.00R - 0.25R