Which term denotes the engine type that transmits power through a shaft in turbine helicopters?

Which term denotes the engine type that transmits power through a shaft in turbine helicopters?

• A. Turboshaft Engine
• B. Jet Engine
• C. Piston Engine
• D. Electric Motor

Answer: (A)

In turbine helicopters, power is delivered to the rotor through a shaft by a turboshaft engine. The turbine generates energy that is primarily used to drive a shaft connected to a reduction gearbox, which lowers the RPM to the rotor speed. The main goal of a turboshaft is to provide shaft horsepower to rotate the rotor, rather than to produce large jet thrust. A jet engine would be focused on producing thrust with exhaust, not driving a rotor through a shaft. A piston engine uses reciprocating motion via a crankshaft, not a turbine-driven shaft. An electric motor turns the rotor with electrical energy, not a turbine-derived shaft power. So the term that best describes an engine whose purpose is to transmit power through a shaft to drive the rotor is turboshaft engine.

In turbine helicopters, power is delivered to the rotor through a shaft by a turboshaft engine. The turbine generates energy that is primarily used to drive a shaft connected to a reduction gearbox, which lowers the RPM to the rotor speed. The main goal of a turboshaft is to provide shaft horsepower to rotate the rotor, rather than to produce large jet thrust.

A jet engine would be focused on producing thrust with exhaust, not driving a rotor through a shaft. A piston engine uses reciprocating motion via a crankshaft, not a turbine-driven shaft. An electric motor turns the rotor with electrical energy, not a turbine-derived shaft power. So the term that best describes an engine whose purpose is to transmit power through a shaft to drive the rotor is turboshaft engine.