The GATE Grind

GATE 2021 AE – Question 14

Propulsion · Intakes and nozzles: non-rotating propulsion components · 1 mark · Multiple choice

The nozzle exit flow patterns A and B shown correspond, respectively, to

source diagram and its labels are reproduced in the attached image.
  1. overexpanded and underexpanded
  2. underexpanded and perfectly expanded
  3. perfectly expanded and underexpanded
  4. underexpanded and overexpanded

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Show answer and explanation

Correct answer: (A) overexpanded and underexpanded

Explanation

The inward oblique shocks in A compress an overexpanded jet; outward expansion fans in B expand an underexpanded jet.