Question

Ratio correction factor is defined as _________

(a) reciprocal of nominal ratio

(b) ratio of nominal ratio to transformation ratio

(c) ratio of transformation ratio to nominal ratio

(d) reciprocal of transformation ratio

I got this question by my college professor while I was bunking the class.

This key question is from Ratios of Instrument Transformers in section Extension of Instrument Ranges of Electrical Measurements

Answer 1

The correct choice is (c) ratio of transformation ratio to nominal ratio

To explain: The ratio correction factor for an instrument transformer is defined as the ratio of the transformation ratio to the nominal ratio.

R.C.F = ^R ⁄ Kn

where,

R.C.F is the ratio correction factor

R is the transformation ratio

Kn is the nominal ratio.