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Device classification: hydraulic coupling Identify the correct category for a hydraulic coupling used between prime mover and driven machine. Choose the correct category.

Difficulty: Easy

Power absorbing machine
Power developing machine
Energy transfer (power transmitting) machine
Energy generating machine

Correct Answer: Energy transfer (power transmitting) machine

Explanation:

Concept

A hydraulic (fluid) coupling transfers torque hydrodynamically from input to output without changing the energy form; it does not create (develop) or primarily absorb power.

Therefore
It is an energy transfer / power transmitting device.

Final Answer
Energy transfer (power transmitting) machine.

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