Question

What is the main concern before doing hopkinson’s test for finding efficiency?

(a) needs one motor and one generator is that it

(b) ignores iron and stray losses

(c) needs one motor

(d) requires identical shunt machines

This question was posed to me by my college professor while I was bunking the class.

I want to ask this question from Efficiency and Testing of DC Machines in section DC Machines of Electrical Machines

Answer 1

Right answer is (d) requires identical shunt machines

To explain I would say: It is must that both the machines are identical as required by the calculations.