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Transformers

Transformers
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

8,800 V
880 V
88 V
8.8 V

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Transformers
If a power transformer is operated at very high frequencies, then ______

Primary reactance is too much increased
Primary will draw large power
Core losses will be excessive
None of the listed here

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Transformers
We can find _______of the transformer with open circuit test.

Turn ratio
Total equivalent resistance
Copper losses
Total equivalent leakage reactance

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Transformers
An open-circuit test on a transformer is conducted primarily to measure

total loss
core loss
insulation resistance
copper loss

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Transformers
The efficiencies of transformers compared with that of electric motors of the same power are

somewhat smaller
much higher
about the same
much smaller

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

Zoom
Boo
Magnetostriction
Hum

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