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TRANSFORMERS

Transformers
A transformer does not posses ______changing property.

Power
Impedance
Voltage
Current

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Transformers
Sumpner's test is conducted on transformer to determine

None of the listed here
Temperature
All day efficiency
Stray losses

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Transformers
A common method of colling a power transformer is

Natural air cooling
Any of the listed here
Air blast cooling
Oil cooling

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Transformers
In a transformer routine efficiency depends upon

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

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Transformers
Natural oil cooling is used for transformers upto a rating of

1000 kVA
250 kVA
500 kVA
3000 kVA

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