For three-phase induction motors which of the following is the least efficient method of speed control? Options: A . &nbspCascade control B . &nbspPole changing C . &nbspRheostat control D . &nbspCombination of cascade and pole changing

For three-phase induction motors which of the following is the least efficient m

Question

For three-phase induction motors which of the following is the least efficient method of speed control?

Options:

A . Cascade control

B . Pole changing

C . Rheostat control

D . Combination of cascade and pole changing

Answer: Option C

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