Under operating conditions, the secondary of a current transformer is always short ciruited because

DGVCL Exam Paper (11-12-2011)
Under operating conditions, the secondary of a current transformer is always short ciruited because

It protects the secondary ciruits

It avoids core saturation and high voltage induction

It is safe to human beings

It protects the primary ciruits

It protects the secondary ciruits

It avoids core saturation and high voltage induction

It is safe to human beings

It protects the primary ciruits

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DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

Earth faults only

Both phase and earth faults

Over voltage faults

Phase faults only

Earth faults only

Both phase and earth faults

Over voltage faults

Phase faults only

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Eliminate losses on account of fair friction

Reduce bearing friction

Reduce winding losses

Eliminate hunting and provide adequate starting torque

Eliminate losses on account of fair friction

Reduce bearing friction

Reduce winding losses

Eliminate hunting and provide adequate starting torque

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DGVCL Exam Paper (11-12-2011)
The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead will be

90 %

More than 90%

Less than 90%

80 %

90 %

More than 90%

Less than 90%

80 %

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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

50

25

15

10

50

25

15

10

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DGVCL Exam Paper (11-12-2011)
Which lightning stroke is most dangerous?

Direct stoke on tower top

Direct stroke on ground wire

Indirect stroke on conductor

Direct stroke on line conductor

Direct stoke on tower top

Direct stroke on ground wire

Indirect stroke on conductor

Direct stroke on line conductor

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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011) Under operating conditions, the secondary of a current transformer is always short ciruited because

DGVCL Exam Paper (11-12-2011) Reactance relay is used to protect against

DGVCL Exam Paper (11-12-2011) The purpose of embedding the damper winding in the pole face of a synchronous motor is to

DGVCL Exam Paper (11-12-2011) The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead 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

DGVCL Exam Paper (11-12-2011) Which lightning stroke is most dangerous?

DGVCL Exam Paper (11-12-2011)
Under operating conditions, the secondary of a current transformer is always short ciruited because

DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

DGVCL Exam Paper (11-12-2011)
The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead 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

DGVCL Exam Paper (11-12-2011)
Which lightning stroke is most dangerous?