Question

The slope of the V-I curve is 13°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .2544 Ω

(b) .7771 Ω

(c) .2308 Ω

(d) .5788 Ω

I have been asked this question in a national level competition.

The query is from Effect of Starting on Power Supply, Motor and Load topic in division Starting of Electric Drives

Answer 1

The correct answer is (c) .2308 Ω

For explanation: The slope of the V-I curve is resistance. The slope given is 13° so R=tan(13°)=.2308 Ω. The slope of the I-V curve is reciprocal of resistance.