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Transformers

Transformers
A transformer oil must be free from

Moisture
Sludge
Gases
Odour

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Transformers
An ideal transformer is one which _______

Has no losses and leakage reactance
None of the listed here
Has same number of primary and secondary turns
Does not work

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Transformers
The primary winding of a power transformer should always be

fused
open
switched
shorted

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Transformers
In a transformer routine efficiency depends upon

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

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Transformers
A transformer will have zero efficiency at

None of the listed here
Half full load
Full load
No load

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Transformers
Which of the following transformer is smallest?

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

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