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Match the stall type in List I with its cause in List II.

List I

A. Trailing edge stall

B. Leading edge stall

C. Thin airfoil stall

D. Shock induced separation

List II

1. Separation bubble at the nose bursting abruptly

2. Separation creeping forward from the rear

3. A shock wave meeting the boundary layer at transonic speed

4. A long bubble growing along a very thin section

Select the correct match.

  • A.A-4, B-3, C-2, D-1
  • B.A-2, B-1, C-4, D-3
  • C.A-1, B-2, C-3, D-4
  • D.A-3, B-4, C-1, D-2

Answer: B

Thick sections tend to stall gently from the trailing edge, moderately thick ones abruptly from a bursting leading edge bubble, very thin ones through a long bubble, and transonic separation is caused by the shock rather than by incidence alone.

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