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 = 2400 V, Np = 75 and Ns = ?
$\frac{E_s}{E_p} = \frac{N_s}{N_p} $
$ N_s = \frac{E_s}{E_p} \times N_p = \frac{2400}{120} \times 75 = 1500$