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Transformers

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

Boo
Zoom
Magnetostriction
Hum

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Transformers
Burden of a current transformer is usually expressed in

Amperes
Volt amperes
Kilowatt
Volts

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Transformers
A transformer will have zero efficiency at

Full load
No load
None of the listed here
Half full load

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Transformers
The voltage transformation ratio of a transformer is equal to the ratio of

secondary induced e.m.f. to primary induced e.m.f.
primary turns to secondary turns
secondary terminal voltage to primary applied voltage
secondary current to primary current

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Transformers
A common method of cooling a power transformer is

Any of these
air blast cooling
oil cooling
natural air cooling

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Transformers
Transformer breaths in when

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

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