Question

For a transformer, the turns ratio is 3 and its efficiency is 0.75. The current flowing in the primary coil is 2A and the voltage applied to it is 100 V. Then the voltage and the current flowing in the secondary coild are..............respectively.
A. 150 V, 1.5 A
B. 300 V, 0.5 A
C. 300 V, 1.5 A
D. 150 V, 0.5 A

Answer 1

Correct Answer - B
`N_(S)/N_(P) = 3`
`V_(S)/V_(P) = I_(P)/I_(S) = N_(S)/N_(P)`
`V_(s) = V_(P).N_(S)/N_(P) = 100 xx 3 = 300 V`
`rArr I_(S) = I_(P).N_(P)/N_(S) = 2 xx 1/3 ~~ 0.5 A`