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Speed-torque characteristic of PMDC motors is _______________

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Speed-torque characteristic of PMDC motors is _______________

(a) Starting from zero increasing continuously

(b) Starting from some positive value and remaining constant

(c) Starting from some positive value and decreasing exponentially

(d) Starting from some positive value and decreasing on straight line

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Question is from PMDC Motors topic in division DC Machines of DC Machines

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Right option is (d) Starting from some positive value and decreasing on straight line

The explanation is: The material chosen for PMDC motor is such that speed torque characteristic of a given motor remains straight line for wider range of torque, for wider range of armature voltage. The straight line is such that it makes positive intercepts on both axes.

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