Question

What is the range for the current density at HT side for a distribution transformer?

(a) 2.4-3.5 Amp per mm^2

(b) 2-2.5 Amp per mm^2

(c) 1-3.5 Amp per mm^2

(d) 2-3.5 Amp per mm^2

I got this question by my school principal while I was bunking the class.

My question is based upon Overall Dimensions topic in section Design of Transformers of Design of Electrical Machines

Answer 1

Correct choice is (b) 2-2.5 Amp per mm^2

Explanation: 2.4-3.5 Amp per mm^2 is the range for the current density at HT side for a power transformer. 2-2.5 Amp per mm^2 is the range for the current density at HT side for a distribution transformer.