A step up transformer is used on 120 V line to provide a P.D. of 2400 V. If the number of turns in primary is 75, then the number of turns in the secondary shall be
Answer & explanation
Correct answer: option 3
Here EP = 120 V, ES = 24000 V, np = 75 and ns = ?
$\frac{E_s}{E_p} = \frac{n_s}{n_p}$
$\Rightarrow n_s = \frac{E_s}{E_p}\times n_p = \frac{2400}{120} \times 75 = 1500$