In a manual transmission, engine torque is applied to the input shaft when the engine is running and the clutch is engaged. The input shaft is responsible for transmitting the torque from the engine to the transmission system. This allows the driver to select different gears using the gear shift lever to control the speed and power delivery to the wheels.
The input shaft is connected to the engine's crankshaft and rotates at the same speed as the engine. When the clutch is engaged, power is transferred from the engine through the input shaft to the transmission, which then adjusts the speed and power output based on the selected gear ratio.
Therefore, the correct answer to the question is:
a. input shaft
This is because the input shaft plays a crucial role in transmitting engine torque to the transmission system in a manual transmission setup.
