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DGVCL Exam Paper (11-12-2011)

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

Restrike
Extinguish
Decrease in size
Increase in size

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DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Single pole switching of circuit breakers
Excitation control
Increasing the turbine valve opening
Phase shifting transformer

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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
Vacuum CB
Air break CB

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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.
Trapping power frequency waves
All of these

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DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Simple protection
Low cost of HVDC terminals
No harmonic problems
Minimum line power losses

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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

The receiving end
Middle of the line
Any place
The sending end

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