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 hyperbolaI had been asked this question in homework.The above asked question is from DC Motor Basics -1 topic in portion DC Motors of DC Machines

An electric motor is having constant output power. So, motor will have

1.	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 hyperbolaI had been asked this question in homework.The above asked question is from DC Motor Basics -1 topic in portion DC Motors of DC Machines
Answer» 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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