GATE_AE_2027_MOCK_04_Q18
GATE 2027 Aerospace Engineering All-India Master Mock 04 (Aerospace Structures, Thin-Walled Beams & Aeroelasticity)
MCQ · 1 Mark
Aerodynamics & Fluid Mechanics • Compressible Flow & Shocks • Normal & Oblique Shock Waves
When an attached oblique shock wave degenerates into a Mach wave, the shock wave angle eta equals:
(A) The Mach angle \mu = arcsin(1/M)
(B) 90 degrees
(C) 0 degrees
(D) The wedge angle heta
Answer Key:
A
Step-by-Step Verified Solution
### Solution: As the deflection angle heta approaches zero, the oblique shock wave weakens into an infinitesimal sound wave (Mach wave), where eta = \mu = arcsin(1/M). Correct: A.