DGVCL Exam Paper (11-12-2011)
Which of the following correctly represents the sequence of operations of isolator, circiut breaker and earthing switch while opening a circuit?

Close circuit breaker-close isolator - open earthing switch
Open isolator close circuit breaker-open earthing switch
Close earthing switch - open ciruit- breaker-open islotor
Open circuit breaker-open isolator-close earthing switch

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DGVCL Exam Paper (11-12-2011)
The purpose of skewing of rotor slots in an induction motor is

To reduce the magnetic hum of the motor
To reduce the locking tendency of the rotor
To increase the distributuion factor
To increase the breadth factor

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