The bus bar zone faults are generally

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DGVCL Exam Paper (11-12-2011)

The bus bar zone faults are generally

Single line to ground faults

Phase to phase faults

Double line to ground faults

Three phase short ciruits

Single line to ground faults

Phase to phase faults

Double line to ground faults

Three phase short ciruits

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

Any place

The sending end

The receiving end

Middle of the line

Any place

The sending end

The receiving end

Middle of the line

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

Less than 90%

80 %

90 %

More than 90%

Less than 90%

80 %

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)

If the percentage reactance of the system upto the point of fault is 20% and the base kVA is 10,000 the short ciruit kVA is

50 MVA

10 MVA

20 MVA

60 MVA

50 MVA

10 MVA

20 MVA

60 MVA

Short circuit kVA = Base kVA/%X

DGVCL Exam Paper (11-12-2011)

DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque

Its torque is proportional to the square of the armature current and speed is directional proporational to torque

Torque and speed are inversely proportional to the square of the armature current

Torque and speed are proportional to the square of the armature current

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque

Its torque is proportional to the square of the armature current and speed is directional proporational to torque

Torque and speed are inversely proportional to the square of the armature current

Torque and speed are proportional to the square of the armature current

Torque in d.c motor = k* φ * Ia
In series motor φ α Ia
Tα I²
N α 1/φ
N α 1/T

DGVCL Exam Paper (11-12-2011)

Which lightning stroke is most dangerous?

Direct stroke on ground wire

Direct stoke on tower top

Indirect stroke on conductor

Direct stroke on line conductor

Direct stroke on ground wire

Direct stoke on tower top

Indirect stroke on conductor

Direct stroke on line conductor

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The bus bar zone faults are generally

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

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

If the percentage reactance of the system upto the point of fault is 20% and the base kVA is 10,000 the short ciruit kVA is

DC series motors are best suited for traction work because

Which lightning stroke is most dangerous?

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