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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
Auto transformer
Potential transformer

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Transformers
What is the approximate efficiency of large transformers?

65%
75%
95 %
85%

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

Current efficiency
Energy efficiency
Power efficiency
None of the listed here

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Transformers
The short circuit test helps us to find

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

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Transformers
The steel used for transformer core has

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

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