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Transformers

Transformers
The approximate efficiency of a large transformer is

50%
65%
95%
80%

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Transformers
A Buchholz relay can be installed on

Auto transformer
Oil cooled transformer
Welding transformer
Air-cooled transformer

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Transformers
Cores of large transformers are built upto nearly circular cross section in order to reduce

Copper loss
Leakage reactance
Iron losses
Eddy current loss

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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?

Horn gaps
Thermal overload relays
Conservator
Breather

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Transformers
Which of the following parts of a transformer is visible from outside?

Primary winding
Core
Bushings
Secondary winding

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Transformers
The transformer that should never the secondary open circuited when primary is energised is _______

Power transformer
Auto transformer
Current transformer
Voltage transformer

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