Question

In a step - down transformer the input voltage is `22kV` and the output voltage is `550V` The ratio of the number of turns in the secondary to that in the primary is .
A. `1:20`
B. `20:1`
C. `1:40`
D. `40:1`

Answer 1

Correct Answer - C
`V_(s)/(V_(p)) = V_(0)/(V_(i)) = N_(s)/(N_(P))`
`N_(s)/N_(P) = (550)/(22 xx 1000) = (1)/(40)` .