Disadvantages of scherbius system

Q.  The disadvantages of scherbius system used for speed controlling in 3 phase induction motor is
- Published on 29 Oct 15

a. It cannot be used for slip ring induction motors
b. It cannot be used for squirrel cage induction motors
c. It can be used for large induction motors
d. None of these

ANSWER: It cannot be used for squirrel cage induction motors

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