Question

The slope of the V-I curve is 56.489°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) 1.5 Ω

(b) 1.6 Ω

(c) 2.5 Ω

(d) 1.4 Ω

I have been asked this question during an online interview.

I'm obligated to ask this question of Induction Motors topic in section Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

Correct choice is (a) 1.5 Ω

The best I can explain: The slope of the V-I curve is resistance. The slope given is 56.489° so R=tan(56.489°)=1.5 Ω. The slope of the I-V curve is reciprocal of resistance.