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The speed torque of the differential compound dc motor is shown below. What conclusions can be made?

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The speed torque of the differential compound dc motor is shown below. What conclusions can be made?

(a) This is an unstable machine

(b) There is regenerative increment in the speed

(c) This is impractical to be used

(d) All of the mentioned

The question was posed to me at a job interview.

Asked question is from Operating Characteristics of DC Motors topic in chapter DC Motors of Electrical Machines

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The correct option is (d) All of the mentioned

To elaborate: This is basically an unstable scenario which makes the machine unable to be used.

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