GATE_AE_2027_MOCK_04_Q44
GATE 2027 Aerospace Engineering All-India Master Mock 04 (Aerospace Structures, Thin-Walled Beams & Aeroelasticity)
MCQ · 2 Marks
Aerodynamics & Fluid Mechanics • Compressible Flow & Shocks • Prandtl-Meyer Expansion Fan
Across a Prandtl-Meyer expansion fan in supersonic flow, which of the following statements is TRUE?
(A) Mach number increases and static pressure decreases isentropically
(B) Mach number decreases and entropy increases
(C) Stagnation pressure drops significantly
(D) Flow turns towards the wall across a compression wave
Answer Key:
A
Step-by-Step Verified Solution
### Solution: A Prandtl-Meyer expansion is a smooth, isentropic expansion process in which Mach number increases, while static pressure, density, and temperature decrease. Stagnation pressure remains constant. Correct: A.