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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Different computers are connected to a LAN by a cable and a

Special wires
Interface card
Telephone line
Modem

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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

Under reach
Pick up
Reach
Over reach

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DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

Earth faults only
Over voltage faults
Phase faults only
Both phase and earth faults

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

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

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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

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

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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
Synchronous motor
Induction 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.

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