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Transformers

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

Zoom
Hum
Boo
Magnetostriction

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Transformers
The noise produced by a transformer is termed as

buzz
hum
zoom
ringing

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Transformers
A no-load test is performed on a transformer to determine

copper loss
magnetising current
efficiency
magnetising current and loss
core loss

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Transformers
The highest voltage for transmitting electrical power in india is

33 kV
66 kV
400 kV
132 kV

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Transformers
The all day efficiency of a transformer is ______ the commercial efficiency.

Less than
More than
The same as
None of the listed here

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Transformers
In an auto transformer, the primary and secondary are _____ coupled.

Magnetically as well as electrically
None of the listed here
Only electrically
Only magnetically

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