GATE_AE_2027_MOCK_03_Q54
GATE 2027 Aerospace Engineering All-India Master Mock 03 (Flight Dynamics, Controls & Space Trajectories)
MSQ · 2 Marks
Propulsion • Thermodynamic Cycles of Gas Turbines • Afterburners & Reheat
Which of the following are consequences of operating an aircraft engine afterburner (reheat)?
(A) Significant increase in maximum thrust for takeoff or supersonic sprint
(B) Substantial increase in Thrust Specific Fuel Consumption (TSFC)
(C) Increase in exhaust jet total temperature
(D) Decrease in exhaust nozzle throat area required for choked flow
Answer Key:
A,B,C
Step-by-Step Verified Solution
### Solution: Reheat injects fuel into the tailpipe, substantially raising total temperature (C), which increases jet exit velocity and thrust (A) at the cost of high TSFC (B). Because T_{0,tailpipe} increases, the choked nozzle throat area must be enlarged (not decreased) to pass the same mass flow without backpressuring the turbine. Correct: A, B, C.