DGVCL Exam Paper (12-06-2016)
The following is/are the characteristics of SF₆ circuit breakers:

None of these
It does not need an auxiliary breaking chamber
Short break time of 2 to 2.5 cycles
All of these

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DGVCL Exam Paper (12-06-2016)
What will happen if the primary of a transformer is connected to DC supply?

Transformer will operate with low efficiency
Transformer may start to smoke and burn
Transformer will operate with high efficiency
No effect

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