Ice and Rain ProtectionAircraft & Engines — DGCA CPL practice questions

All 4 questions — Ice and Rain Protection

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

1. Q1. The difference between anti-icing and de-icing is:

   • A.They are the same
   • B.Anti-icing prevents ice forming; de-icing removes ice already formed✓
   • C.De-icing is used only on the ground
   • D.Anti-icing is mechanical only

   Why: Anti-icing is continuous prevention (e.g. hot leading edges); de-icing is cyclic removal (e.g. inflatable boots).

2. Q2. The most common wing ice protection on jet transport aircraft is:

   • A.Pneumatic boots
   • B.Thermal anti-icing using hot bleed air in the leading edges✓
   • C.Electrical heater mats on the whole wing
   • D.Glycol weeping wings

   Why: Hot compressor bleed air ducted through the leading edges keeps them above freezing; boots are typical of smaller turboprops.

3. Q3. Pitot tubes, static ports and AOA vanes are protected from ice by:

   • A.Bleed air
   • B.Electrical heating✓
   • C.Rubber boots
   • D.Rain repellent

   Why: Small critical sensors use electric heaters — as do cockpit windows.

4. Q4. Pneumatic de-icing boots remove ice by:

   • A.Heating the leading edge
   • B.Cyclic inflation that cracks the accumulated ice off✓
   • C.Spraying alcohol
   • D.Vibrating ultrasonically

   Why: The rubber boots inflate in cycles, breaking the ice which the airstream then carries away.