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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?

9 V
900 V
0.9 V
90 V

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

Infinite
1 ohm
Zero
1000 ohms

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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

120 V
12 V
2,400 V
240 V

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Transformers
Which of the following 3 phase connections of transformer create disturbances in communication systems

Delta/Delta
Star/Delta
Delta/Star
Star/Star

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Transformers
A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

0.85 V
0 V
1 V
1.7 V

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Transformers
A tap changer is used on a transformer for

None of the listed here
Adjustment in both primary and secondary
Adjustments in secondary voltage
Adjustment in primary voltage

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