Drag: DGCA Technical General questions

Question 1

Which statement is true regarding aeroplane flight at L/Dmax?

Accepted Answer

Any angle of attack other than that for L/Dmax increases total drag for a given aeroplane's lift.

Answer

Any angle of attack other than that for L/Dmax increases parasite drag.

Answer

Any angle of attack other than that for L/Dmax increases the lift/drag ratio.

Answer

Any angle of attack other than that for L/Dmax increases the lift and reduces the drag.

Question 2

If the same angle of attack is maintained in ground effect as when out of ground effect, lift will:

Accepted Answer

Increase, and induced drag will decrease.

Answer

Decrease, and parasite drag will decrease.

Answer

Decrease, and parasite drag will increase.

Answer

Increase and induced drag will increase.

Question 3

The best L/D ratio of an aircraft in a given configuration is a value that:

Accepted Answer

Remains constant regardless of Indicated Airspeed changes.

Answer

Varies with Indicated Airspeed.

Answer

Varies depending upon the weight being carried.

Answer

Varies with air density.

Question 4

At the airspeed represented by point B, in steady flight, the aeroplane will:

Accepted Answer

Have its maximum L/D ratio.

Answer

Have its minimum L/D ratio.

Answer

Be developing its maximum coefficient of lift.

Answer

Be developing its minimum coefficient of drag.

Question 5

At a constant velocity in airflow, a high aspect ratio wing will have in comparison with a low aspect ratio wing:

Accepted Answer

Decreased drag, especially at a high angle of attack.

Answer

Increased drag, especially at a low angle of attack.

Answer

Increased drag, especially at a high angle of attack.

Answer

Decreased drag, especially at low angles of attack.

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