High-Lift DevicesAircraft & Engines — DGCA CPL practice questions
Question 1 of 4
The flap type giving the greatest increase in lift, often multi-slotted on transport aircraft, is the:
All 4 questions — High-Lift Devices
Aircraft & Engines · DGCA CPL. The correct option is marked on each.
Q1. The flap type giving the greatest increase in lift, often multi-slotted on transport aircraft, is the:
- A.Plain flap
- B.Split flap
- C.Slotted flap
- D.Fowler flap✓
Why: The Fowler flap moves aft to increase wing area before deflecting down to add camber — the greatest lift gain of the trailing-edge flaps.
Q2. Lowering trailing-edge flaps:
- A.Increases Cʟₘₐₓ and increases the stalling angle
- B.Increases Cʟₘₐₓ but reduces the stalling angle✓
- C.Reduces Cʟₘₐₓ and the stalling angle
- D.Has no effect on the stalling angle
Why: Flaps raise Cʟₘₐₓ (lower stall speed) but the stall occurs at a smaller angle of attack.
Q3. Which flap produces the most drag for a given lift increase?
- A.Fowler flap
- B.Slotted flap
- C.Split flap✓
- D.Plain flap
Why: The split flap gives about the same lift as a plain flap but with more drag; the Fowler gives the least drag for its lift gain.
Q4. Krueger flaps are often fitted to the inboard wing of swept-wing aircraft to:
- A.Reduce induced drag
- B.Promote a root stall before a tip stall✓
- C.Increase aileron effectiveness
- D.Act as speed brakes
Why: Krueger flaps hinge forward from the lower surface; used inboard they encourage the root to stall first, keeping the tips (and ailerons) flying.