Buchholz relay causes

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

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

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

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

Low copper loss

Low copper as well as iron loss

Low voltage

Low iron loss

Low copper loss

Low copper as well as iron loss

Low voltage

Low iron loss

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DGVCL Exam Paper (11-12-2011)
An AC series circuit has R = 6 Ω, XL = 20 Ω and Xc = 12 Ω. The ciruit power factor will be

0.6 lagging

0.8 lagging

0.5 leading

0.6 leading

0.6 lagging

0.8 lagging

0.5 leading

0.6 leading

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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

80 %

Less than 90%

More than 90%

90 %

80 %

Less than 90%

More than 90%

90 %

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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

Under reach

Reach

Pick up

Over reach

Under reach

Reach

Pick up

Over reach

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DGVCL Exam Paper (11-12-2011)
In a power plant, a reserve generating capacity which is not in service but is in operation is known as

Spinning reserve

Cold reserve

Firm power

Hot reserve

Spinning reserve

Cold reserve

Firm power

Hot reserve

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DGVCL Exam Paper (11-12-2011)

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) An AC series circuit has R = 6 Ω, XL = 20 Ω and Xc = 12 Ω. The ciruit power factor will be

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 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) In a power plant, a reserve generating capacity which is not in service but is in operation is known as

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)
An AC series circuit has R = 6 Ω, XL = 20 Ω and Xc = 12 Ω. The ciruit power factor will be

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 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)
In a power plant, a reserve generating capacity which is not in service but is in operation is known as