Discussion
Assertion (A): A fluid coupling is an inefficient way of reducing speed.
Reason (R): Its loss equals the slip times the input power.
Select the correct option.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. In any slip device the output power is \( (1-s) \) times the input and the remaining \( s \) becomes heat, so running at half speed wastes half the input. A converter drive instead reduces the power drawn from the supply, which is why slip devices have largely been displaced where energy matters.
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