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DGVCL Exam Paper (11-12-2011)

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

Relay backup
Control backup
Remote backup
Breaker backup

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DGVCL Exam Paper (11-12-2011)
If the fault current is 2000 A, the relay plug setting is 50% and the CT ratio is 400/5, the plug setting multiple will be

25
15
50
10

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DGVCL Exam Paper (11-12-2011)
If a 5 A fuse is blown frequently in a house lighting circuit, it is required to

Reduce the load
Insert a fuse of higher voltage rating
Check the load
Insert a fuse of higher current rating

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

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

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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 %
5 %
6 %
4 %

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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)
People can interact with each other through any part of the world through video conferencing using

Speaker
Webcam
Scanner
Joystick

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