DGVCL Exam Paper (12-06-2016)
Wave trap is used to trap waves of:

Higher frequencies entering generator or transformer units
Power frequencies
None of these
All of these

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DGVCL Exam Paper (12-06-2016)
GUVNL is:

Gujarat Urja Vikas Nikash Limited
Gujarat Urja Vikas Nigam Limited
Gujarat Urja Vyapar Nigam Limited
None of these

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DGVCL Exam Paper (12-06-2016)
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:

Transformer may start to smoke and burn
Eddy Current and Hysteresis losses will be excessive
Current will be too much high
No effect

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