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

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

(a) Rectangular Hyperbolic

(b) Parabola

(c) Circle

(d) Ellipse

The question was asked during an interview.

The query is from Dynamic Braking of DC Series Motors topic in portion Braking of DC Motors & Induction Motors of Electric Drives

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Correct option is (a) Rectangular Hyperbolic

Easiest explanation: The shape of the speed-torque characteristics in the DC series motor is a rectangular hyperbola. The motor equation is Eb=Vt-IaRa=Km∅ωm. N=(Vt/KmIa)-Ra/Km. Ia∝√T  .N∝1÷√T.

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