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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Permittivity is expressed in terms of

Farad/m
N/m
farad/sq. m.
Weber /m

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DGVCL Exam Paper (11-12-2011)
Transposition of transmission line is done to

Balance line voltage drop
Reduce skin effect
Reduce line loss
Reduce corona

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DGVCL Exam Paper (11-12-2011)
The bus bar zone faults are generally

Three phase short ciruits
Double line to ground faults
Single line to ground faults
Phase to phase faults

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DGVCL Exam Paper (11-12-2011)
What happens to the contents of RAM (Random Access Memory) when the power of the computer is turned off?

Content is lost
Content gets corrupted
Content is transferred to other memory
Content remains intact

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DGVCL Exam Paper (11-12-2011)
A 3 phase, 6 pole induction motor operates on 440 V, 50 Hz, supply. If the actual speed of the motor is 960 rpm the slip will be

5 %
6 %
0.4 %
4 %

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Ns = 120f/P
Slip=(Ns-Nr)/Ns
Ns = 1000 and Nr = 960
from equation of slip, S = (1000-960)/1000
S = 0.04 or 4%

DGVCL Exam Paper (11-12-2011)
Under operating conditions, the secondary of a current transformer is always short ciruited because

It is safe to human beings
It avoids core saturation and high voltage induction
It protects the primary ciruits
It protects the secondary ciruits

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