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The speed-torque characteristic of a DC series motor closely resembles a:

AParabola opening upwards
BHorizontal straight line
CStraight line through origin
DRectangular hyperbola

Explanation

For a DC series motor below saturation, Torque T proportional to I_a^2 and Speed N inversely proportional to I_a, making the N-vs-T curve a rectangular hyperbola.

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