Alternating Current - Result Question 35

37. A 220 volts input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80, the current drawn by the primary windings of the transformer is

[2010]

(a) 3.6 ampere

(b) 2.8 ampere

(c) 2.5 ampere

(d) 5.0 ampere

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Answer:

Correct Answer: 37. (d)

Solution:

(d) V2V1=0.8I1I2V2I2V1I1=0.8

V1=220V,I2=2.0A,V2=440V

I1=V2I2V1×108=440×2×10220×8=5A



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