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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The positive and negative sequence impedance of a transmission line are

Different
Infinite
Zero
Equal

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DGVCL Exam Paper (11-12-2011)
What type of insulator is used if the direction of the transmission line is to be changed?

Pin type
Strain type
Shakle type
Suspebsion type

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DGVCL Exam Paper (11-12-2011)
If the excitation of a synchronous generator fails, it acts as a

Synchronous motor
Induction motor
Synchronous generator
Induction generator

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if excitation of synchronous generator fails, operate as induction motor

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

0.8 lagging
0.6 leading
0.6 lagging
0.5 leading

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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
Minimum line power losses
No harmonic problems

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

Earth faults only
Over voltage faults
Phase faults only
Both phase and earth faults

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