Jet Engines MCQs December 5, 2025August 22, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. What is the primary function of a jet engine? (A) To provide lift (B) To increase fuel efficiency (C) To control the aircraft’s direction (D) To generate thrust 2. Which type of jet engine uses a rotating fan to produce thrust? (A) Turbojet (B) Turboshaft (C) Turbofan (D) Ramjet 3. In a turbojet engine, what is the primary source of thrust? (A) The fan (B) The compressor (C) The exhaust gases (D) The turbine 4. What component in a turbojet engine compresses incoming air? (A) Turbine (B) Fan (C) Compressor (D) Nozzle 5. What is the function of the afterburner in a jet engine? (A) To cool the exhaust gases (B) To increase thrust by burning additional fuel (C) To reduce engine noise (D) To improve fuel efficiency 6. Which type of jet engine is typically used in supersonic aircraft? (A) Ramjet (B) Turbofan (C) Turboshaft (D) Turbojet 7. In a turbofan engine, what is the function of the fan? (A) To compress the air (B) To cool the engine (C) To mix fuel and air (D) To generate thrust by accelerating air through the engine 8. What does the term “bypass ratio” refer to in a turbofan engine? (A) The ratio of the air that bypasses the engine core to the air that passes through it (B) The ratio of fuel to air (C) The ratio of thrust to weight (D) The ratio of compressor pressure to ambient pressure 9. Which engine component converts the energy from the hot gases into mechanical work? (A) Compressor (B) Turbine (C) Fan (D) Nozzle 10. What is a common feature of a turboprop engine? (A) It relies on jet thrust alone (B) It uses a propeller driven by a turbine to generate thrust (C) It has a high bypass ratio (D) It operates only at high speeds 11. Which type of jet engine is known for its high fuel efficiency at subsonic speeds? (A) Turbojet (B) Turbofan (C) Turboshaft (D) Ramjet 12. What is the primary function of the “combustor” in a jet engine? (A) To drive the turbine (B) To compress the incoming air (C) To cool the engine (D) To mix and burn fuel with air 13. Which type of jet engine is typically used in helicopters? (A) Turbojet (B) Turbofan (C) Turboshaft (D) Ramjet 14. What does “N1” refer to in a turbofan engine? (A) The rotational speed of the high-pressure compressor (B) The rotational speed of the low-pressure compressor (C) The fuel flow rate (D) The temperature of the exhaust gases 15. In a dual-spool jet engine, what does “N2” refer to? (A) The rotational speed of the high-pressure spool (B) The fuel flow rate (C) The thrust output (D) The temperature of the exhaust gases 16. What is the main advantage of using a high-bypass turbofan engine? (A) Improved fuel efficiency and reduced noise levels (B) Greater thrust (C) Higher operating temperatures (D) Greater complexity 17. What is the function of the “thrust reverser” in a jet engine? (A) To cool the engine (B) To increase the engine’s power output (C) To reduce engine noise (D) To redirect thrust forward to assist with braking during landing 18. Which component of a jet engine helps in cooling the hot exhaust gases? (A) Nozzle (B) Turbine (C) Combustor (D) Intercooler 19. What does the term “EPR” stand for in jet engine performance measurement? (A) Exhaust Pressure Ratio (B) Engine Pressure Ratio (C) Engine Power Rating (D) Exhaust Power Ratio 20. In a turbofan engine, what does the “core” refer to? (A) The fan blades (B) The outer casing of the engine (C) The part that houses the turbine (D) The central portion of the engine where combustion occurs