Which of the following clutches is classified as a positive clutch?

• A. Disc or plate clutch
• B. Cone clutch
• C. Centrifugal clutch
• D. Jaw clutch

Answer: (D)

A positive clutch allows for rigid engagement, meaning that once the clutch is engaged, both driving and driven components are locked together without any relative motion between them. This type of clutch ensures that power is transmitted without slippage, providing a direct connection.

The jaw clutch exemplifies this by utilizing teeth or jaws that interlock when the clutch is engaged. This design prevents slippage and ensures a firm connection between components, which is ideal for applications requiring reliable and consistent torque transmission. The mechanical engagement is achieved quickly and effectively, which is often necessary in high-performance or precise machinery.

While the other types of clutches listed may serve specific purposes and can engage and disengage power transmission, they typically allow for some degree of slip or are designed for gradual engagement rather than the instantaneous lock characteristic of positive clutches.