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

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DGVCL Exam Paper (11-12-2011)

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

Minimum line power losses

Low cost of HVDC terminals

No harmonic problems

Simple protection

Minimum line power losses

Low cost of HVDC terminals

No harmonic problems

Simple protection

At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

Capacitor

Resistor

Conductor

Voltage source

Capacitor

Resistor

Conductor

Voltage source

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 %

90 %

Less than 90%

More than 90%

80 %

90 %

Less than 90%

More than 90%

Efficiency= output power/input power
efficiency = (v*i*cosφ)/((v*i*cosφ)+(x² Pc)+(Pi)) x=fractional part of full load

DGVCL Exam Paper (11-12-2011)

Rated making capacity of a ciruit breaker is equal to

2.55 X rated symmetrical breaking capacity

Rated symmetrical breaking capacity

√2 X rated symmetrical breaking capacity

1.11 X rated symmetrical breaking capacity

2.55 X rated symmetrical breaking capacity

Rated symmetrical breaking capacity

√2 X rated symmetrical breaking capacity

1.11 X rated symmetrical breaking capacity

DGVCL Exam Paper (11-12-2011)

An IDMT relay provides

A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current

An inverse time current characteristic

A definite time cuttent characteristic

An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current

A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current

An inverse time current characteristic

A definite time cuttent characteristic

An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current

DGVCL Exam Paper (11-12-2011)

The bus bar zone faults are generally

Single line to ground faults

Phase to phase faults

Three phase short ciruits

Double line to ground faults

Single line to ground faults

Phase to phase faults

Three phase short ciruits

Double line to ground faults

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

At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

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

Rated making capacity of a ciruit breaker is equal to

An IDMT relay provides

The bus bar zone faults are generally

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Apple

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