Question

For a P.T. the turns ratio is defined as the _________

(a) n = ^Np ⁄ Ns

(b) n =  ^1 ⁄ Np

(c) n = Ns

(d) n =  ^Ns ⁄ Np

I got this question during an online interview.

I need to ask this question from Ratios of Instrument Transformers topic in section Extension of Instrument Ranges of Electrical Measurements

Answer 1

Correct choice is (a) n = ^Np ⁄ Ns

To explain: For a potential transformer, the turns ratio is defined as the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.

n = ^Np ⁄ Ns

where, n is the turns ratio

            Np is the primary turns

Ns is the secondary turns.