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Transformers

Transformers
A transformer has 200 W as iron loss at full load. The iron loss at full load. The iron loss at half full load will be

200 W
400 W
50 W
100 W

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Transformers
Two things which are same for primary and secondary of transformer are ______

Currents and induced voltages
Ampere turns and voltage per turns
None of the listed here
Resistance and leakage reactances

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Transformers
A Buchholz relay can be installed on

Air-cooled transformer
Auto transformer
Welding transformer
Oil cooled transformer

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Transformers
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

approximately equal to one
great than one
less than one
None of these

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Transformers
The core type transformer is generally suitable for ______

High voltage and small output
None of the listed here
High voltage and high output
Low voltage and high output

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Transformers
What is the approximate efficiency of large transformers?

65%
85%
75%
95 %

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