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Transformers

Transformers
The noise resulting from vibrations of laminations set by magnetic forces, is termed as

Boo
Magnetostriction
Hum
Zoom

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Transformers
Transformer breaths in when

load on it increases
load on it decreases
load remains constant
None of these

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Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

9 V
0.9 V
90 V
900 V

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Transformers
A common method of cooling a power transformer is

natural air cooling
oil cooling
air blast cooling
Any of these

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Transformers
For the parallel operation of single phase transformers it is necessary that they should have

same kVA rating
same efficiency
same number of turns on the secondary side.
same polarity

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Transformers
Power transformers are generally designed to have maximum efficiency around

half-load
no-load
10% overload
near full-load

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