A turbine engine transmitting power through a shaft as would be found in a turbine helicopter

A turbine engine transmitting power through a shaft as would be found in a turbine helicopter

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

Answer: (A)

A turbine engine that delivers power through a shaft is designed to provide mechanical shaft power to drive a rotor, not primarily to produce jet thrust. In a turboshaft engine, the hot gases passing through the turbine drive a shaft connected to a reduction gearbox that turns the helicopter’s rotor. The main goal is to extract energy as shaft power for the rotor, with only a small amount of exhaust thrust. This makes it the standard choice for turbine helicopters. By contrast, a jet engine creates most of its output as thrust by accelerating exhaust, a piston engine uses a crankshaft to deliver reciprocating power, and an electric motor relies on electricity to turn the rotor rather than a turbine-driven shaft.

A turbine engine that delivers power through a shaft is designed to provide mechanical shaft power to drive a rotor, not primarily to produce jet thrust. In a turboshaft engine, the hot gases passing through the turbine drive a shaft connected to a reduction gearbox that turns the helicopter’s rotor. The main goal is to extract energy as shaft power for the rotor, with only a small amount of exhaust thrust. This makes it the standard choice for turbine helicopters. By contrast, a jet engine creates most of its output as thrust by accelerating exhaust, a piston engine uses a crankshaft to deliver reciprocating power, and an electric motor relies on electricity to turn the rotor rather than a turbine-driven shaft.