Which instrument measures the engine's mechanical power output (torque) as part of engine performance monitoring?

Which instrument measures the engine's mechanical power output (torque) as part of engine performance monitoring?

• A. Gas Turbine Fuel Flow Meter
• B. Oil Pressure Gauge
• C. Tachometer
• D. Torquemeter

Answer: (D)

Torque is the actual twisting force the engine delivers to the shaft, and measuring it directly shows the engine’s mechanical power output in real time. A torquemeter is built to sense that twisting force on a rotating component and convert it into a readable torque value, giving immediate, real-time data for engine performance. The fuel flow meter tracks how much fuel is being burned, which can imply potential power but doesn’t measure the actual torque. The oil pressure gauge monitors lubrication status, not the load on the shaft. The tachometer shows how fast the engine is turning (RPM) but doesn’t itself measure torque, though power can be inferred if torque is known. So for direct measurement of mechanical power output as torque, the torquemeter is the appropriate instrument.

Torque is the actual twisting force the engine delivers to the shaft, and measuring it directly shows the engine’s mechanical power output in real time. A torquemeter is built to sense that twisting force on a rotating component and convert it into a readable torque value, giving immediate, real-time data for engine performance. The fuel flow meter tracks how much fuel is being burned, which can imply potential power but doesn’t measure the actual torque. The oil pressure gauge monitors lubrication status, not the load on the shaft. The tachometer shows how fast the engine is turning (RPM) but doesn’t itself measure torque, though power can be inferred if torque is known. So for direct measurement of mechanical power output as torque, the torquemeter is the appropriate instrument.