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In a DC series motor, the electromagnetic torque developed is proportional to ______

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In a DC series motor, the electromagnetic torque developed is proportional to ______

(a) Ia

(b) Ia^2

(c) Ia^3

(d) Ia^.5

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This intriguing question originated from Dynamics in section Dynamics of Electrical Drives of Electric Drives

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Correct choice is (b) Ia^2

Explanation: In a DC series motor, the electromagnetic torque developed is equal to KmΦIa. In a DC series, the motor field winding is connected in series with the armature so the flux in the field winding is proportional to current. T = KmΦIa α Ia^2.

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