Question

The slope of the V-I curve is 35.48°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) 0.452 Ω

(b) 0.462 Ω

(c) 0.752 Ω

(d) 0.712 Ω

I got this question in semester exam.

My doubt is from Induction Motors in division Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

Correct answer is (d) 0.712 Ω

Explanation: The slope of the V-I curve is resistance. The slope given is 35.48° so R=tan(35.48°)=.712 Ω. The slope of the I-V curve is reciprocal of resistance.