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.
All of these
Trapping power frequency waves

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Universal motor
Capacitor start capacitor run motor
Split phase motor
Capacitor start motor

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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

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