Discussion
A torquemeter on a turboprop measures
Answer: D
Correct answer: Shaft torque
A torquemeter measures the twisting moment the engine applies to the propeller shaft, usually from the axial displacement of a helical gear against a hydraulic piston, or from the strain in the shaft itself.
Torque is the turboprop's thrust-setting parameter because thrust cannot be measured directly and, with rotational speed, torque gives shaft power from \( P = T\omega \). Since a turboprop is normally flown at constant rpm with the propeller governing, torque alone then varies with power, which is what makes it a workable single indication for the pilot.
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