DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Which motor is used to start heavy loads?

Cumulatively compounded motor

Differentially compounded motor

Shunt motor

Series motor

Cumulatively compounded motor

Differentially compounded motor

Shunt motor

Series motor

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DGVCL Exam Paper (11-12-2011)
In a series RLC circuit at resonance

Current is maximum and power factor is unity

Current is minimum and power factor is 0.5

Current is maximum and power factor is 0.5

Current is minimum and power factor is unity

Current is maximum and power factor is unity

Current is minimum and power factor is 0.5

Current is maximum and power factor is 0.5

Current is minimum and power factor is unity

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DGVCL Exam Paper (11-12-2011)
The circuit breaker generally used in railway traction is

Minimum Oil CB

Bulk Oil CB

Air break CB

Vacuum CB

Minimum Oil CB

Bulk Oil CB

Air break CB

Vacuum CB

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DGVCL Exam Paper (11-12-2011)
If the dielectric strength of the medium between the contacts builds up more rapidly than the restriking voltage the arc will

Increase in size

Decrease in size

Extinguish

Restrike

Increase in size

Decrease in size

Extinguish

Restrike

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

Low iron loss

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

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DGVCL Exam Paper (11-12-2011)
The best location of the power factor correction equipment to be installed in the transmission line is at

Middle of the line

Any place

The receiving end

The sending end

Middle of the line

Any place

The receiving end

The sending end

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