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Transformers

Transformers
A transformer has 200 W as iron loss at full load. The iron loss at full load. The iron loss at half full load will be

100 W
400 W
200 W
50 W

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

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

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Transformers
In a transformer routine efficiency depends upon

Power factor of load
Load current
Both power factor and load current
Supply frequency

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

None of the listed here
Power efficiency
Current efficiency
Energy efficiency

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Transformers
Harmonics in transformer result in

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

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Transformers
Leakage flux in a transformer occurs because

Air is not a good magnetic insulator
Transformer is not an efficient device
Iron core has high permeability
Applied voltage is sinusoidal

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