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

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DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current
A definite time cuttent characteristic
An inverse time current characteristic

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor
Capacitor start motor
Capacitor start capacitor run motor
Universal motor

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

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