DGVCL EXAM PAPER (11-12-2011) QUIZ

The bus bar zone faults are generally

Phase to phase faults

Double line to ground faults

Three phase short ciruits

Single line to ground faults

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It is difficult interrupt a capacitive current because

Stored energy in the capacitor is very high

The restriking voltage can be high

Current magnitude is very small

It has a leading power factor

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Transposition of transmission line is done to

Reduce corona

Balance line voltage drop

Reduce line loss

Reduce skin effect

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An over excited synchronous motor draws current at

Leading power factor

Lagging power factor

Unity power factor

Depends on nature of load

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The corona effect can be minimized by increasing

The length of the conductor

Spacing between the conductors

Both spacing between the conductors and diameter of the conductor

Diameter of the conductor

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If the excitation of a synchronous generator fails, it acts as a

Induction motor

Synchronous motor

Induction generator

Synchronous generator

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The best location of the power factor correction equipment to be installed in the transmission line is at

The receiving end

Any place

Middle of the line

The sending end

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Bulk power transmission over long HVDC lines are preferred on account of

No harmonic problems

Low cost of HVDC terminals

Simple protection

Minimum line power losses

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Which of the following correctly represents the sequence of operations of isolator, circiut breaker and earthing switch while opening a circuit?

Close circuit breaker-close isolator - open earthing switch

Open isolator close circuit breaker-open earthing switch

Open circuit breaker-open isolator-close earthing switch

Close earthing switch - open ciruit- breaker-open islotor

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Which lightning stroke is most dangerous?

Indirect stroke on conductor

Direct stoke on tower top

Direct stroke on line conductor

Direct stroke on ground wire

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