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Working range of the speed-torque characteristic, with increasing speed will ___________

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in DC Machines by (506k points)
Working range of the speed-torque characteristic, with increasing speed will ___________

(a) Reduce

(b) Increase

(c) Remain same

(d) Cannot comment

This question was posed to me during an online exam.

My doubt is from Speed Control Using Field Control of Shunt Motor topic in chapter DC Motors of DC Machines

1 Answer

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Best answer
Right answer is (a) Reduce

To elaborate: The working range of the speed-torque characteristic reduces with increasing speed in order for the armature current not to exceed the full-load value with a weakening field. Thus, armature current gives the bound limit for curve.

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