Discussion
Consider the following statements about slipping couplings.
1. Their loss is the slip times the input power.
2. Efficiency falls as the speed is reduced.
3. They are more efficient than a converter at reduced speed.
Which are correct?
Answer: C
The first two follow from the slip relation. The third is the reverse of the truth: a converter slows the machine and therefore reduces the power drawn, while the coupling keeps the machine at full speed and burns the difference.
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