GATE_AE_2027_MOCK_03_Q27 GATE 2027 Aerospace Engineering All-India Master Mock 03 (Flight Dynamics, Controls & Space Trajectories) NAT · 1 Mark
Propulsion • Thermodynamic Cycles of Gas Turbines • Turbojet and Turbofan Performance

A ramjet flies at speed V_0 = 900 m/s. The nozzle expands the gas to exhaust velocity V_e = 1500 m/s. Neglecting fuel mass flow, what is the propulsive efficiency \eta_p of the ramjet? (Round off to two decimal places).

Answer Key:
0.75

Step-by-Step Verified Solution

### Solution: \eta_p = 2 V_0 / (V_0 + V_e) = (2 * 900) / (900 + 1500) = 1800 / 2400 = 0.75. Correct: 0.75.
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