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The shape of the speed-armature current characteristics in DC series motor are __________

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The shape of the speed-armature current characteristics in DC series motor are __________

(a) Hyperbolic

(b) Parabola

(c) Circle

(d) Ellipse

I have been asked this question in unit test.

My question is from Dynamic Braking of DC Series Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives

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The correct answer is (a) Hyperbolic

Best explanation: The shape of the speed-armature current characteristics in DC series motor is hyperbolic. The motor equation is Eb=Vt-IaRa=Km∅ωm. N=(Vt/KmIa)-Ra/Km. N∝1÷Ia.

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