Stability and Control: DGCA Technical General questions

Question 1

When the CG is close to the forward limit:

Accepted Answer

Very high stick forces are required to pitch because the aircraft is very stable.

Answer

Very small forces are required on the control column to produce pitch.

Answer

Longitudinal stability is reduced.

Answer

Stick forces are the same as for an aft CG.

Question 2

With flaps lowered, lateral stability:

Accepted Answer

Will be reduced because the centre of lift of each semi-span is closer to the wing root.

Answer

Will be increased because of the effective increase of dihedral.

Answer

Will be increased because of increased lift.

Answer

Will not be affected.

Question 3

Dihedral gives a stabilizing rolling moment by causing an increase in lift:

Accepted Answer

On the lower wing if the aircraft is sideslipping.

Answer

On the up-going wing when the aircraft rolls.

Answer

On the down-going wing when the aircraft rolls.

Answer

On the lower wing whenever the aircraft is in a banked attitude.

Question 4

A yaw damper:

Accepted Answer

Augments stability.

Answer

Increases rudder effectiveness.

Answer

Must be disengaged before making a turn.

Answer

Increases the rate of yaw.

Question 5

Following a lateral disturbance, an aircraft with Dutch roll instability will:

Accepted Answer

Develop simultaneous oscillations in roll and yaw.

Answer

Go into a spiral dive.

Answer

Develop oscillations in pitch.

Answer

Develop an unchecked roll.

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