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Electrical Oscillations

A step down t...

Question

A step down transformer converts transmission line voltage from 11000 V to 220 V The primary of the transformer has 6000 turns and efficiency of the transformer is 60 %. If the output power is 9 kW, then the number of turns in the secondary is

A

20

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B

80

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C

120

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D

160

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Solution

The correct option is A $120$
In step down transformer
$\frac{V_{p}}{V_{s}} = \frac{n_{p}}{n_{s}} \Rightarrow \frac{11000}{220} = \frac{6000}{n_{s}} \Rightarrow n_{s} = 120 t u r n s$

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