Which propulsion type is commonly used for space launch vehicles and does not rely on atmospheric air?

Which propulsion type is commonly used for space launch vehicles and does not rely on atmospheric air?

• A. Jet engine
• B. Rocket engine
• C. Turbofan
• D. Piston engine

Answer: (B)

Space launch requires engines that don’t rely on atmospheric air, so the propulsion type used is the rocket engine. A rocket engine carries both fuel and oxidizer and generates thrust by expelling reaction mass, which lets it operate in the vacuum of space as well as inside the atmosphere. In contrast, jet engines and turbofans are air-breathing engines that rely on ambient air to provide oxygen for combustion and thus need an atmosphere to function. Piston engines likewise require atmospheric oxygen. So the rocket engine is the one designed to work without external air.

Space launch requires engines that don’t rely on atmospheric air, so the propulsion type used is the rocket engine. A rocket engine carries both fuel and oxidizer and generates thrust by expelling reaction mass, which lets it operate in the vacuum of space as well as inside the atmosphere. In contrast, jet engines and turbofans are air-breathing engines that rely on ambient air to provide oxygen for combustion and thus need an atmosphere to function. Piston engines likewise require atmospheric oxygen. So the rocket engine is the one designed to work without external air.