DGCA Technical General question paper, September 2025

Question 1

A large sideslip builds up during a manoeuvre. What is the mechanism by which the fin itself can stall?

Accepted Answer

The sideslip angle acts as the fin's angle of attack, and beyond its critical angle the fin stalls like any aerofoil

Answer

Opposite aileron reduces the airflow reaching the fin until it can no longer produce side force

Answer

The fin stalls whenever the rudder is deflected fully, whatever the sideslip angle

Answer

Fin stall happens only when the fuselage blanks the fin at low sideslip angles

Question 2

A pilot is told the aeroplane is in an incipient stall. What does that describe?

Accepted Answer

Separation has started over parts of the wing, but the stall is not yet fully developed

Answer

Only the wing tips have separated while the root is still producing full lift

Answer

Every part of the wing has lost lift and the stall is fully developed

Answer

The aeroplane is spinning with one wing stalled and the other unstalled

Question 3

Which single factor decides whether an aeroplane is longitudinally stable, and by how much?

Accepted Answer

Where the CG lies relative to the neutral point

Answer

The amount of wing dihedral and sweep

Answer

The size of the rudder and its trim tab

Answer

How thrust and lift are balanced against weight and drag

Question 4

An aeroplane without a working yaw damper enters Dutch roll. What control input should the pilot use to stop it?

Accepted Answer

Aileron (roll) inputs

Answer

A speed reduction below Mmo

Answer

Rudder (yaw) inputs

Answer

A change of CG position

Question 5

An aeroplane is statically unstable in pitch. What can be said of its dynamic stability?

Accepted Answer

It can never be dynamically stable

Answer

It is always dynamically stable

Answer

Its dynamic stability varies from one design to another

Answer

It is dynamically stable only at high speed

79 more questions in this paper, free with an account.