Aircraft Wheels, Tyres, and BrakesAircraft & Engines — DGCA CPL practice questions
Question 1 of 5
Fusible plugs in transport-aircraft wheels:
All 5 questions — Aircraft Wheels, Tyres, and Brakes
Aircraft & Engines · DGCA CPL. The correct option is marked on each.
Q1. Fusible plugs in transport-aircraft wheels:
- A.Lock the brakes when hot
- B.Melt at a set temperature to deflate the tyre in a controlled way and prevent explosion✓
- C.Measure tyre pressure
- D.Indicate creep
Why: Overheated brakes can burst a tyre; the fusible plug core melts first, releasing pressure safely.
Q2. Aircraft tyres are inflated with nitrogen because it:
- A.Is cheaper than air
- B.Is inert and does not support combustion✓
- C.Increases tyre pressure with heat
- D.Weighs less than air
Why: Inert nitrogen removes the fire/explosion risk of hot oxygen-bearing air inside the tyre.
Q3. The minimum aquaplaning speed in knots is approximately:
- A.9 × √(tyre pressure in PSI)✓
- B.3 × tyre pressure
- C.√(9 × weight)
- D.Half the touchdown speed
Why: V(aquaplane) ≈ 9√P. A wedge of water lifts the tyre off the runway, destroying braking and steering.
Q4. Compared with steel, carbon brakes are:
- A.Heavier but cheaper
- B.Lighter, absorb more heat and work better when hot✓
- C.Only used on light aircraft
- D.Prone to fade at high temperature
Why: Carbon-carbon discs save weight, absorb more energy and retain effectiveness at high temperatures.
Q5. The anti-skid system works by:
- A.Locking all wheels together
- B.Releasing and reapplying brake pressure on a wheel about to skid✓
- C.Applying the parking brake
- D.Reducing engine thrust
Why: Wheel-speed sensors detect impending lock-up; the control unit momentarily releases that wheel's pressure for maximum braking without a skid.