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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The mutual inductance between two unity coupled coils of 9 H and 4 H is

6 H
2.2 H
36 H
13 H

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DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

Tripping fault current
Trapping high frequency waves entering into generator/transformer unit.
Trapping power frequency waves
All of these

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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

0.4 %
4 %
5 %
6 %

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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)
The main criterion for the design of a distributor is

Voltage drop
Corona loss
Radio interference
Temperature rise

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

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

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

Speaker
Scanner
Joystick
Webcam

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

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