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?
Open circuit breaker-open isolator-close earthing switch
Open isolator close circuit breaker-open earthing switch
Close circuit breaker-close isolator - open earthing switch
Close earthing switch - open ciruit- breaker-open islotor
In all machine stator and rotor magnetic field rotates (stationary with respect to each other) at synchronous speed with respect to stationary observer.
EXAMIANS