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The shape of the speed-armature current characteristics in DC shunt motor is __________

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The shape of the speed-armature current characteristics in DC shunt motor is __________

(a) Hyperbolic

(b) Parabola

(c) Negative slope linear line

(d) Ellipse

The question was posed to me by my school teacher while I was bunking the class.

My doubt is from Countercurrent Braking of DC Shunt Motors in chapter Braking of DC Motors & Induction Motors of Electric Drives

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Correct choice is (c) Negative slope linear line

Explanation: The shape of the speed-armature current characteristics in DC shunt motor is negative slope linear line. The motor equation is Eb=Vt-IaRa=Km∅ωm. N=(Vt-IRa)/Km. N vs Ia is a negative slope line with slope = -Ra/Km.

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