Discussion
The induction motor is the most widely used machine in industry because it is
Answer: C
Correct answer: rugged, cheap and needs little maintenance
The cage rotor has no windings, no brushes, no slip rings and no commutator, so there is nothing to wear out and nothing to adjust, and it can be built to a low cost in very large numbers. Its efficiency is good but not the best available at every rating, and its torque at standstill is well below its maximum. It is variable-speed capable only with a drive, which is a recent advantage rather than an inherent one.
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