Jet engines, turboprops, and rockets MCQs – Aerospace

1. Which of the following is NOT a type of jet engine?
(A) Turbojet
(B) Turbofan
(C) Turboprop
(D) Ramjet

2. What is the primary difference between a turbojet and a turbofan engine?
(A) Turbojets use a propeller, while turbofans do not.
(B) Turbofans have a large bypass air stream, increasing efficiency and reducing noise.
(C) Turbojets are used in commercial aircraft, while turbofans are used in military aircraft.
(D) Turbofans use solid fuel, whereas turbojets use liquid fuel.

3. Which engine type is most commonly used in modern commercial airliners?
(A) Turbojet
(B) Turbofan
(C) Ramjet
(D) Turboprop

4. What is the main function of a turboprop engine?
(A) It generates thrust entirely from jet exhaust.
(B) It drives a propeller using a gas turbine for propulsion.
(C) It operates without oxygen and is used in space travel.
(D) It produces thrust using a nuclear reaction.

5. In which scenario is a turboprop engine more efficient than a turbofan?
(A) High-speed supersonic flight
(B) Low-speed, short-haul regional flights
(C) Intercontinental long-haul flights
(D) Space exploration

6. Which of the following is a characteristic of a ramjet engine?
(A) It requires a propeller for takeoff.
(B) It operates efficiently only at high speeds (supersonic or hypersonic).
(C) It can function in space without atmospheric oxygen.
(D) It is commonly used in commercial passenger planes.

7. What is the main disadvantage of a rocket engine compared to a jet engine?
(A) Rockets cannot operate in space.
(B) Rockets require atmospheric oxygen to function.
(C) Rockets have lower specific impulse and carry their own oxidizer, making them less efficient.
(D) Rockets cannot generate high thrust.

8. Why do rockets work in space while jet engines do not?
(A) Rockets use nuclear fuel, while jet engines use kerosene.
(B) Rockets carry both fuel and oxidizer, whereas jet engines rely on atmospheric oxygen.
(C) Jet engines are more powerful than rockets but require a runway.
(D) Jet engines use chemical reactions that only work under Earth’s gravity.

9. What type of fuel is typically used in turbofan and turbojet engines?
(A) Liquid hydrogen
(B) Kerosene-based aviation fuel (Jet-A, Jet-A1)
(C) Solid propellant
(D) Liquid oxygen and liquid methane

10. What is the key advantage of a scramjet over a conventional jet engine?
(A) It can operate at subsonic speeds efficiently.
(B) It uses a turbine for compression.
(C) It allows continuous supersonic combustion, enabling hypersonic speeds.
(D) It is used in helicopters.