GATE_AE_2027_MOCK_05_Q59 GATE 2027 Aerospace Engineering All-India Master Mock 05 (High-Yield Comprehensive Grand Finale) MCQ · 2 Marks
Propulsion • Compressors and Turbines • Axial Flow Gas Turbines & Blade Cooling

The flow through an axial gas turbine stator nozzle guide vane (NGV) row involves:

(A) Flow acceleration and static pressure decrease (favorable pressure gradient)
(B) Flow deceleration and static pressure increase (adverse pressure gradient)
(C) Zero change in velocity or pressure
(D) Centrifugal pumping only
Answer Key:
A

Step-by-Step Verified Solution

### Solution: Turbine nozzle guide vanes act as nozzles: they accelerate the gas and expand it, creating a favorable pressure gradient with low boundary layer separation risk compared to compressor diffusers. Correct: A.
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