DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Which motor is used to start heavy loads?

Cumulatively compounded motor

Series motor

Differentially compounded motor

Shunt motor

Cumulatively compounded motor

Series motor

Differentially compounded motor

Shunt motor

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DGVCL Exam Paper (11-12-2011)
The circuit breaker generally used in railway traction is

Minimum Oil CB

Bulk Oil CB

Air break CB

Vacuum CB

Minimum Oil CB

Bulk Oil CB

Air break CB

Vacuum CB

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DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Low cost of HVDC terminals

Simple protection

Minimum line power losses

No harmonic problems

Low cost of HVDC terminals

Simple protection

Minimum line power losses

No harmonic problems

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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

Over reach

Reach

Pick up

Under reach

Over reach

Reach

Pick up

Under reach

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DGVCL Exam Paper (11-12-2011)
A device connected to the computer which converts digital signals to analog and vice-versa is

UPS

Modem

CPU

Keyboard

UPS

Modem

CPU

Keyboard

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper loss

Low voltage

Low iron loss

Low copper as well as iron loss

Low copper loss

Low voltage

Low iron loss

Low copper as well as iron loss

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