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DGVCL Exam Paper (11-12-2011)

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

10 MVA
60 MVA
20 MVA
50 MVA

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Short circuit kVA = Base kVA/%X

DGVCL Exam Paper (11-12-2011)
In which of the following motors, the stator and rotor magnetic fields rotate at the same speed?

Reluctance motor
Universal motor
Induction motor
Synchronous motor

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

In all machine stator and rotor magnetic field rotates (stationary with respect to each other) at synchronous speed with respect to stationary observer.

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%

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

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

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DGVCL Exam Paper (11-12-2011)
Which type of back up protection is widely used for the protection of transmission lines?

Breaker backup
Control backup
Remote backup
Relay backup

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DGVCL Exam Paper (11-12-2011)
An over excited synchronous motor draws current at

Unity power factor
Depends on nature of load
Lagging power factor
Leading power factor

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Over excitation : leading current
Under excitation : lagging current
Normal excitation : current with unity PF (in phase current)

MORE MCQ ON DGVCL Exam Paper (11-12-2011)

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