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Transformer

In a transfor...

Question

In a transformer the transformation ratio is 0.3. If 220 V ac is fed to the primary, then the voltage across the secondary will be

A

44 V

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B

55 V

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C

60 V

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D

66 V

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Solution

The correct option is A 66 V
Here, transformation ratio, k = 0.3
As, $k = \frac{N_{s}}{N_{p}} = \frac{V_{s}}{V_{p}}$

$∴ V_{s} = k V_{p}$

$\Rightarrow 0.3 \times 220 = 66 V .$

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