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An electric motor is having constant output power. So, motor will have a torque speed characteristic _______________________

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An electric motor is having constant output power. So, motor will have a torque speed characteristic _______________________

(a) Circle about the origin.

(b) Straight line parallel to the speed axis.

(c) Straight line through the origin.

(d) Rectangular hyperbola

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The above asked question is from DC Motor Basics -1 topic in portion DC Motors of DC Machines

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Correct answer is (d) Rectangular hyperbola

Explanation: In case of DC motor for the constant output power, Ea×Ia = T×ω. As T×ω = Constant, so the torque speed characteristic is in the form of rectangular hyperbola, which represented as xy= constant.

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