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Transformers

Transformers
Noise level test in a transformer is a

type test
None of these
special test
routine test

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Transformers
A transformer operates poorly at very low frequencies because _____

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

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

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

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Transformers
The primary leakage flux links _____

None of the listed here
Secondary winding only
Primary winding only
Both primary and secondary windings

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Transformers
Open circuit test on transformers is conducted to determine

copper losses
eddy current losses
core losses
hysteresis losses

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Transformers
A step up transformer increases

Voltage
Power
Frequency
Current

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