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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?

0.9 V
900 V
9 V
90 V

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

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

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Transformers
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of

less than 15 A
15 A
more than 15 A
None of these

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

Remains unchanged
None of the listed here
Is increased
Is decreased

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Transformers
In a transformer the resistance between its primary and secondary is

Infinite
Zero
1 ohm
1000 ohms

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Transformers
The noise produced by a transformer is termed as

zoom
buzz
hum
ringing

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