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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
0.9 V
900 V
9 V

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Transformers
A transformer is an efficient device because it _______

Is a static device
Uses capacitive coupling
Uses electric coupling
Uses inductive coupling

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Transformers
The steel used for transformer core has

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

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Transformers
Two things which are same for primary and secondary of transformer are ______

None of the listed here
Currents and induced voltages
Ampere turns and voltage per turns
Resistance and leakage reactances

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Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

0.4
0.2
25
5

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Transformers
No-load on a transformer is carried out to determine

efficiency of the transformer
copper loss
magnetising current and loss
magnetising current

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