If the fault current is 2000 A, the relay plug setting is 50% and the CT ratio is 400/5, the plug setting multiple will be

DGVCL Exam Paper (11-12-2011)
If the fault current is 2000 A, the relay plug setting is 50% and the CT ratio is 400/5, the plug setting multiple will be

25

15

10

50

25

15

10

50

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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 reactance voltage

The cross-magnetizing effect of armature mmf

The demagnetizing effect of armature mmf

Both the cross-magnetizing mmf and the reactance voltage

The reactance voltage

The cross-magnetizing effect of armature mmf

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DGVCL Exam Paper (11-12-2011)
The bus bar zone faults are generally

Three phase short ciruits

Double line to ground faults

Phase to phase faults

Single line to ground faults

Three phase short ciruits

Double line to ground faults

Phase to phase faults

Single line to ground faults

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DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

Tripping fault current

Trapping high frequency waves entering into generator/transformer unit.

All of these

Trapping power frequency waves

Tripping fault current

Trapping high frequency waves entering into generator/transformer unit.

All of these

Trapping power frequency waves

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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?

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

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)
Buchholz relay causes

Tripping for major faults and alarm for minor faults

Tripping for both major and minor faults

Tripping for minor faults and alarm for major faults

Alarm for both major and minor faults

Tripping for major faults and alarm for minor faults

Tripping for both major and minor faults

Tripping for minor faults and alarm for major faults

Alarm for both major and minor faults

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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011) If the fault current is 2000 A, the relay plug setting is 50% and the CT ratio is 400/5, the plug setting multiple will be

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

DGVCL Exam Paper (11-12-2011) The bus bar zone faults are generally

DGVCL Exam Paper (11-12-2011) In carrier current protection, the purpose of the wave trap is for

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?

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

DGVCL Exam Paper (11-12-2011)
If the fault current is 2000 A, the relay plug setting is 50% and the CT ratio is 400/5, the plug setting multiple will be

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

DGVCL Exam Paper (11-12-2011)
The bus bar zone faults are generally

DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

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?

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