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Transformers

Transformers
An isolation transformer has primary to secondady turns ratio of

1:1
Can be any ratio
2:1
1:2

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Transformers
Sumpner's test is conducted on transformers to determine

stray losses
None of these
all-day efficiency
temperature

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Transformers
The permissible flux density in case of cold rolled grain oriented steel is around

1.7 Wb/m²
2.7 Wb/m²
3.7 Wb/m²
4.7 Wb/m²

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Transformers
The highest voltage for transmitting electrical power in india is

400 kV
66 kV
33 kV
132 kV

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Transformers
What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

4
0.96
0.4
9.6

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Transformers
The hum in a transformer is mainly attributed to

oil in the transformer
magnetostriction
mechanical vibrations
load changes

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MORE MCQ ON Transformers

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