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Transformers

Transformers
The primary winding of a power transformer should always be

open
shorted
fused
switched

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Transformers
The permissible flux density in case of cold rolled grain oriented steel is around

1.7 Wb/m²
3.7 Wb/m²
4.7 Wb/m²
2.7 Wb/m²

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Transformers
A transformer does not posses ______changing property.

Current
Voltage
Power
Impedance

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Transformers
A transformer will work on

Dc only
Ac only
None of the listed here
AC as well as DC

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Transformers
Efficiency of a power transformer is of the order of

100 per cent
25 per cent
98 per cent
50 per cent

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Transformers
No-load on a transformer is carried out to determine

efficiency of the transformer
magnetising current
copper loss
magnetising current and loss

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