Stalling, Spinning, and RecoveryAircraft & Engines — DGCA CPL practice questions

All 6 questions — Stalling, Spinning, and Recovery

Aircraft & Engines · DGCA CPL. The correct option is marked on each.

1. Q1. An aircraft stalls when:

   • A.Airspeed falls below Vs
   • B.The critical angle of attack is exceeded✓
   • C.Power is reduced to idle
   • D.Load factor reaches 2g

   Why: The stall is purely an AOA phenomenon — exceed the critical angle (≈16°) and the wing stalls at any speed, in any attitude.

2. Q2. In a 60° banked level turn, the stall speed increases by approximately:

   • A.20%
   • B.30%
   • C.41%✓
   • D.100%

   Why: A 60° level turn gives a 2g load factor; Vs rises with the square root of load factor — √2 ≈ 1.41, i.e. about 41% higher.

3. Q3. Compared with the power-off stall speed, the power-on stall speed is:

   • A.Higher
   • B.Lower✓
   • C.The same
   • D.Double

   Why: Thrust's vertical component supports part of the weight and slipstream adds lift, so the power-on stall speed is lower.

4. Q4. The first and most critical action in stall recovery is to:

   • A.Apply full power
   • B.Level the wings with aileron
   • C.Move the control column forward to reduce AOA✓
   • D.Raise the flaps

   Why: Only reducing the AOA below the critical angle restores smooth airflow; power is applied simultaneously to minimise height loss.

5. Q5. The generic spin recovery sequence is:

   • A.Full power, ailerons into the spin, rudder with the rotation
   • B.Power idle, ailerons neutral, full opposite rudder, elevator forward✓
   • C.Power idle, full aileron opposite, elevator back
   • D.Full power, rudder neutral, elevator forward

   Why: Power to IDLE, ailerons NEUTRAL, FULL OPPOSITE rudder, then push the elevator forward to break the stall.

6. Q6. A 20% reduction in aircraft weight reduces the stall speed by approximately:

   • A.5%
   • B.10%✓
   • C.20%
   • D.40%

   Why: Vs varies with the square root of weight: a 20% lighter aircraft stalls about 10% slower.