GATE_AE_2027_MOCK_04_Q28
GATE 2027 Aerospace Engineering All-India Master Mock 04 (Aerospace Structures, Thin-Walled Beams & Aeroelasticity)
MCQ · 1 Mark
Propulsion • Inlets, Combustors & Nozzles • Convergent-Divergent Nozzle & Choking
When a convergent nozzle operates in an under-expanded state, the nozzle exit static pressure P_e is:
(A) Higher than ambient pressure P_a
(B) Lower than ambient pressure P_a
(C) Equal to ambient pressure P_a
(D) Zero
Answer Key:
A
Step-by-Step Verified Solution
### Solution: Under-expansion means the nozzle does not expand the gas completely to ambient pressure before exit, so P_e > P_a and expansion fans form outside the nozzle. Correct: A.