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

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

(a) Rectangular Hyperbolic

(b) Whole x-y plane

(c) Circle

(d) Ellipse

I have been asked this question by my school teacher while I was bunking the class.

This interesting question is from Countercurrent Braking of DC Shunt Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives

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Correct option is (a) Rectangular Hyperbolic

To elaborate: The shape of the speed-torque characteristics in the DC shunt 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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