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Transformers

Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

90 V
900 V
9 V
0.9 V

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Transformers
The all day efficiency of a transformer is also called its

Power efficiency
None of the listed here
Energy efficiency
Current efficiency

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Transformers
The primary and secondary windings are wound on the top of each other in order to reduce ______

Copper losses
Leakage reactance
Winding resistance
Iron losses

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Transformers
A transformer oil must be free from

Odour
Gases
Sludge
Moisture

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Transformers
The effect of leakage flux in a transformer is to ______

Cause voltage drop in the windings
Increase copper losses
None of the listed here
Decreases copper losses

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Transformers
The steel used for transformer core has

All of the listed here
High silicon content
High permeability
Low hysteresis loss

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