DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Phase shifting transformer
Excitation control
Single pole switching of circuit breakers
Increasing the turbine valve opening

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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 increase the breadth factor
To increase the distributuion factor
To reduce the locking tendency of the rotor

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

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DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means

The change in the same reading when the input is first increased and then decreased
The repeatability of the instrument
The inaccuracy due to change in temperature
The reliability of the instrument

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