If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

DGVCL Exam Paper (11-12-2011)
If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

Over reach

Under reach

Pick up

Reach

Over reach

Under reach

Pick up

Reach

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

Single line to ground faults

Three phase short ciruits

Phase to phase faults

Double line to ground faults

Single line to ground faults

Three phase short ciruits

Phase to phase faults

Double line to ground faults

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

Tripping for major faults and alarm for minor faults

Alarm for both major and minor faults

Tripping for minor faults and alarm for major faults

Tripping for both major and minor faults

Tripping for major faults and alarm for minor faults

Alarm for both major and minor faults

Tripping for minor faults and alarm for major faults

Tripping for both major and minor faults

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper as well as iron loss

Low voltage

Low copper loss

Low iron loss

Low copper as well as iron loss

Low voltage

Low copper loss

Low iron loss

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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 of the following power distribution system gives better reliabity ?

Ring main system

DC 3 wire system

Radial system

None of these

Ring main system

DC 3 wire system

Radial system

None of these

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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011) If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

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

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

DGVCL Exam Paper (11-12-2011) Distribution transformers have good all day efficiency due to

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 of the following power distribution system gives better reliabity ?

DGVCL Exam Paper (11-12-2011)
If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

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

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

DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

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 of the following power distribution system gives better reliabity ?