DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is directional proporational to torque
Torque and speed are inversely proportional to the square of the armature current
Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Torque and speed are proportional to the square of the armature current

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for major faults and alarm for minor faults
Tripping for both major and minor faults
Alarm for both major and minor faults
Tripping for minor faults and alarm for major faults

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

The demagnetizing effect of armature mmf
Both the cross-magnetizing mmf and the reactance voltage
The cross-magnetizing effect of armature mmf
The reactance voltage

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

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