Question

The slope of the V-I curve is 1.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .019 Ω

(b) .036 Ω

(c) .075 Ω

(d) .084 Ω

I have been asked this question in an internship interview.

My question comes from Induction Motors Speed Control topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

Right choice is (a) .019 Ω

The explanation: The slope of the V-I curve is resistance. The slope given is 1.° so R=tan(1.1°)=.019 Ω. The slope of the I-V curve is reciprocal of resistance.