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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

Over reach
Pick up
Reach
Under reach

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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?

Universal motor
Induction motor
Synchronous motor
Reluctance motor

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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 mutual inductance between two unity coupled coils of 9 H and 4 H is

6 H
13 H
36 H
2.2 H

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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?

Relay backup
Breaker backup
Control backup
Remote backup

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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

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

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DGVCL Exam Paper (11-12-2011)
First zone distance relay protects the transmission line section upto

80 % of its full length
50 % of its full length
Its full length
25 % of its full length

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