Discussion
An eddy current coupling controls speed by
Answer: B
Correct answer: varying the excitation of a field between two rotating members
An eddy current coupling has a driven drum and a driving member separated by an air gap, with a field coil between them. Field current sets the torque transmitted and hence the slip. Like the fluid coupling it is a slip device, so its loss is the slip fraction of the input power, all of it appearing as heat in the drum.
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