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Transformers

Transformers
The open circuit test on a transformer gives _______

Copper losses
Friction losses
Iron losses
Total losses

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

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

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Transformers
A transformer does not posses ______changing property.

Impedance
Power
Current
Voltage

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Transformers
An isolation transformer has primary to secondady turns ratio of

2:1
Can be any ratio
1:2
1:1

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Transformers
The approximate efficiency of a large transformer is

50%
80%
95%
65%

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Transformers
Which of the following parts of a transformer is visible from outside?

Core
Secondary winding
Bushings
Primary winding

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