Determine the ratio of weight of copper in an autotransformer and a two winding transformer if the transformation ratio is 3.

Question

Question

This question was previously asked in

MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper

Answer 1

Concept

The ratio of the weight of the conductor material in an autotransformer and two-winding transformer is given by:

\({W_{auto}\over W_{2-wdg}}=1-{1\over a}\).

where, a = Transformation ratio

Calculation

Given, a = 2

\({W_{auto}\over W_{2-wdg}}=1-{1\over 3}\)

\({W_{auto}\over W_{2-wdg}}=0.66\)