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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 delivererd.

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a

2750V, 25A, 5500W

b

5500V, 0.16A, 2750W

c

1600V, 1A, 5000W

d

4000V, 1A, 5500W

answer is A.

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Detailed Solution

 IN a transformer εsεp=NsNp 

εs=220×252⇒2750V

For a 100% efficient transformer

→ipεp=isεs

ip=2×2750220=25A

→p=isεs⇒5500W

 

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