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Transformers

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

Eddy current
Friction
Hysteresis
Copper

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

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

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Transformers
Harmonics in transformer result in

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

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Transformers
In a transformer, leakage flux

Is negligible at full load
Produces mutually induced emf
Is minimised by interleaving the primary and secondary windings
Helps in transfer of energy

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Transformers
The effect of leakage flux in a transformer is to ______

Cause voltage drop in the windings
Increase copper losses
None of the listed here
Decreases copper losses

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Transformers
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

equal to the primary current
four times the primary current
one-fourth the primary current and equal to the primary current
one-fourth the primary current

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