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Transformers

Transformers
A transformer oil must be free from

Moisture
Sludge
Odour
Gases

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Transformers
Sumpner's test is conducted on transformer to determine

None of the listed here
All day efficiency
Temperature
Stray losses

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Transformers
When load on a transformer is increased, the eddy current _____

Is increased
Remains unchanged
None of the listed here
Is decreased

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Transformers
The maximum load that a power transformer can carry is limited by its

voltage ratio
dielectric strength of oil
temperature rise
copper loss

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

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

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Transformers
The leakage flux in a transformer depends upon

load current and voltage
load current, voltage and frequency
load current
load current, voltage, frequency and power factor

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