High Speed Flight: DGCA Technical General questions

Question 1

The area rule applied to high speed aircraft requires:

Accepted Answer

That the variation of cross-sectional area along the length of the aircraft follows a smooth pattern.

Answer

That the cross-sectional area shall be as small as possible.

Answer

That the maximum cross-sectional area of the fuselage should occur at the wing root.

Answer

That the fuselage and the wing area be of a ratio of 3:1.

Question 2

What is the movement of the centre of pressure when the wing tips of a sweptwing aeroplane are shock-stalled first?

Accepted Answer

Inward and forward.

Answer

Outward and forward.

Answer

Inward and aft.

Answer

Outward and aft.

Question 3

For a wing section of given thickness, the critical Mach number:

Accepted Answer

Will decrease if angle of attack is increased.

Answer

Will increase if angle of attack is increased.

Answer

Will not change with changes of angle of attack.

Answer

Is only influenced by changes in temperature.

Question 4

As air flows through a shock wave:

Accepted Answer

Its speed decreases.

Answer

Its speed increases.

Answer

Its speed remains the same.

Answer

It changes direction to flow parallel with the Mach cone.

Question 5

A bow wave is:

Accepted Answer

A shock wave that forms immediately ahead of an aircraft which is travelling faster than the speed of sound.

Answer

A shock wave which forms on the nose of the aircraft at MCRIT.

Answer

The shape formed when the shock waves on the upper and lower wing surface meet at the trailing edge.

Answer

The shape of a shock wave when viewed vertically.

22 more questions in this chapter, free with an account