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QUESTIONS

Transformers
A common method of colling a power transformer is

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

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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

250 kVA
1000 kVA
3000 kVA
500 kVA

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Transformers
The power transformer is a constant

Power device
Current device
Voltage device
Main flux device

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Transformers
The highest voltage for transmitting electrical power in india is

33 kV
400 kV
66 kV
132 kV

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