In a manual transmission, the clutch disc must do what when engaged?

When the clutch disc is engaged in a manual transmission, it must engage without any slippage to effectively transmit power from the engine to the transmission. This engagement occurs when the clutch pedal is released, allowing the clutch disc to make firm contact with the flywheel. Such a connection ensures that the engine's rotational force is transferred directly to the drivetrain, enabling the vehicle to move smoothly without interruption in power delivery.

Slippage would cause a lack of responsiveness and can lead to excessive wear and overheating of the clutch components. Therefore, proper engagement at a full torque transfer is essential for the mechanical efficiency and longevity of the clutch system in a manual transmission. In contrast, the other options describe conditions that are either not relevant or detrimental to the proper operation of the clutch.