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Transformers

Transformers
Which of the following insulating materials can withstand the highest temperature safely?

Glass fibre
Cellulose
Mica
Asbestos

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

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

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Transformers
Short circuit test on transformers is conducted to determine

eddy current losses
core losses
copper losses
hysteresis losses

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Transformers
Sumpner's test is conducted on transformer to determine

All day efficiency
Temperature
None of the listed here
Stray losses

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Transformers
Harmonics in transformer result in

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

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Transformers
Which of the following transformer is smallest?

2kVA, 200 Hz
2kVA, 500 Hz
2kVA, 50 Hz
2kVA, 400 Hz

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