The GATE Grind

GATE Propulsion: Engine performance: ramjet, turbojet, turbofan, turboprop, turboshaft and after-burners – Previous Year Questions

13 GATE previous year questions on Engine performance: ramjet, turbojet, turbofan, turboprop, turboshaft and after-burners (Propulsion, Aerospace Engineering) with answers and explanations, from every paper.

  1. GATE 2021 AE Q16 (1 mark, Multiple choice) – At fixed flight speed, the specific thrust of a turbojet engine with increasing flight altitude
  2. GATE 2021 AE Q17 (1 mark, Multiple choice) – At fixed flight Mach number and altitude, increasing compressor pressure ratio of a turbofan engine causes propulsive efficiency to
  3. GATE 2021 AE Q53 (2 marks, Numerical answer) – A turbojet has flight speed 270 m/s, inlet static enthalpy 260 kJ/kg, fuel/air ratio 0.019, fuel heating value 44.5 MJ/kg, heat loss 25 kJ/kg air and…
  4. GATE 2021 AE Q55 (2 marks, Numerical answer) – A twin-spool turbofan at sea level (1 bar,288 K) has separate cold and hot nozzles, total air flow 100 kg/s, cold exhaust temperature 288 K, fan…
  5. GATE 2022 AE Q34 (1 mark, Numerical answer) – In a static test, a turbofan engine with bypass ratio of 9 has core hot exhaust speed 1.5 times that of fan exhaust speed. The engine is operated at a…
  6. GATE 2022 AE Q64 (2 marks, Numerical answer) – An ideal ramjet is to operate with exhaust gases optimally expanded to ambient pressure at an altitude where temperature is 220 K. The exhaust speed…
  7. GATE 2023 AE Q28 (1 mark, Multiple select) – From the options given, select all that are true for turbofan engines with afterburners.
  8. GATE 2026 AE Q24 (1 mark, Multiple select) – For a given air-standard power, the propulsive efficiency of a turbofan engine is more than that of a turbojet engine. Which of the following is/are…
  9. GATE 2026 AE Q38 (2 marks, Multiple choice) – In an ideal turbofan engine shown in the figure below, the compressor is driven by the high pressure turbine, and the fan is driven by the low…
  10. GATE 2026 AE Q44 (2 marks, Multiple select) – Which of the following process(es) is/are involved in the compression of air in an ideal ramjet engine?
  11. GATE 2025 AE Q61 (2 marks, Numerical answer) – An ideal turbofan with a bypass ratio of 5 has core mass flow rate, m a,c = 100 kg/s. The core and the fan exhausts are separate and optimally…
  12. GATE 2025 AE Q64 (2 marks, Numerical answer) – An ideal ramjet with an optimally expanded exhaust is travelling at Mach 3. The ambient temperature and pressure are 260 K and 60 kPa, respectively.…
  13. GATE 2024 AE Q34 (1 mark, Numerical answer) – An aircraft with a turbojet engine is flying with 250 m/s speed at an altitude, where the density of air is 1 kg/m3. The inlet area of the engine is 1…