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TRANSFORMERS

Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?

Current transformer
Power transformer
Potential transformer
Auto transformer

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Transformers
What is the approximate efficiency of large transformers?

85%
95 %
65%
75%

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Transformers
The all day efficiency of a transformer is also called its

None of the listed here
Energy efficiency
Current efficiency
Power efficiency

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Transformers
The short circuit test helps us to find

None of the listed here
Cu loss at any desire load
Cu loss at no load
Iron loss at no load

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Transformers
The steel used for transformer core has

Low hysteresis loss
All of the listed here
High silicon content
High permeability

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