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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
People can interact with each other through any part of the world through video conferencing using

Joystick
Speaker
Webcam
Scanner

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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

90 %
Less than 90%
80 %
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 picture on the monitor of a computer is made up of tiny coloured dots called

Icons
Spots
Points
Pixels

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DGVCL Exam Paper (11-12-2011)
Rated making capacity of a ciruit breaker is equal to

2.55 X rated symmetrical breaking capacity
1.11 X rated symmetrical breaking capacity
Rated symmetrical breaking capacity
√2 X rated symmetrical breaking capacity

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DGVCL Exam Paper (11-12-2011)
Fot fast load flow calculations, the best method is

Newton-Raphson
Approximate method
Gauss-Siedal
De-coupled method

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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
Induction motor
Universal 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.

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