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Q.

A step up transformer works on 220V and gives 2A to an external resistor. The turn ratio between the primary and secondary coils is 2 : 25. Assuming 100% efficiency, find the secondary voltage. Primary current and power delivered

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a

2750V, 25A, 5500W

b

1600V, 1A, 5000W

c

4000V, 1A, 5500W

d

5500V, 0.16A, 2750W

answer is A.

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Detailed Solution

⇒ VsVp=NsNP 

⇒Vs220=252

⇒Vs=2750V

⇒ip=NPNS×is=252×2=25A

⇒P=Vsis=2750×2=5500W .

 

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