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Transformers

Transformers
A transformer will work on

AC as well as DC
Ac only
Dc only
None of the listed here

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Transformers
What is the approximate efficiency of large transformers?

75%
95 %
65%
85%

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Transformers
A transformer transfers electrical energy from primary to secondary usually with a change in ______

Time period
Voltage
Frequency
Power

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Transformers
Which of the following is not a part of transformer installation?

Breather
Exciter
Conservator
Buchholz relay

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Transformers
Which of the following 3 phase connections of transformer create disturbances in communication systems

Star/Delta
Delta/Star
Delta/Delta
Star/Star

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

Either low or high voltage winding
High voltage winding
None of the listed here
Low voltage winding

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