Question

The slope of the V-I curve is 15.5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .277 Ω

(b) .488 Ω

(c) .443 Ω

(d) .457 Ω

The question was posed to me in final exam.

My doubt is from Energy Relations During Starting topic in division Starting of Electric Drives

Answer 1

The correct answer is (a) .277 Ω

To elaborate: The slope of the V-I curve is resistance. The slope given is 15.5° so R=tan(15.5°)=.277 Ω. The slope of the I-V curve is reciprocal of resistance.