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Transformers

Transformers
When load on a transformer is decreased, ______loss is decreased

Friction
Hysteresis
Eddy current
Copper

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Transformers
Harmonics in transformer result in

magnetic interference with communication circuits
All of the listed here
increased core losses
increased I2R losses

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Transformers
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____.

100 W
200 W
None of the listed here
400 W

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Transformers
A transformer operates poorly at very low frequencies because _____

Primary reactance is too much increased
None of the listed here
Permeability of core is increased
Magnetising current is abnormally high

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Transformers
Sumpner's test is conducted on transformers to determine

all-day efficiency
None of these
temperature
stray losses

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Transformers
The all day efficiency of a transformer is also called its

Power efficiency
None of the listed here
Current efficiency
Energy efficiency

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