Red Seal Industrial Mechanic (Millwright) Practice Exam

What is the primary role of a clutch in a mechanical system?

1. To increase the power output of the engine

2. To engage or disengage power transmission

3. To change the direction of mechanical power

4. To regulate the speed of the motor

The correct answer is: To engage or disengage power transmission

The primary role of a clutch in a mechanical system is to engage or disengage power transmission. This allows for the controlled transfer of power from the engine to the drivetrain, or between components of machinery, facilitating smooth starts and stops in operation. When the clutch is engaged, it connects the engine's output to the wheels or driven component, allowing power to flow. When disengaged, it interrupts this connection, which is essential during shifting gears in vehicles or when maintenance is needed on machinery. The functionality of the clutch is crucial for preventing damage during operation as it allows operators to control the engagement between rotating parts and manage loads safely and effectively. For example, in vehicles, the clutch enables the driver to change gears without grinding them, contributing to smoother operation and longevity of the system.