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Which of the following DC motor has negative speed regulation?

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Which of the following DC motor has negative speed regulation?

(a) Shunt motors

(b) Series motors

(c) Differential compound motors

(d) Series and differential compound motors

This question was addressed to me in examination.

My question is taken from Operating Characteristics of DC Compound Motor topic in section Characteristics of DC Motors of DC Machines

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Right choice is (c) Differential compound motors

Explanation: In differential compound motors flux will reduce as load is increased because series flux opposes shunt field flux. This will increase speed upon addition of load. Therefore, it has negative speed regulation means speed will increase due to increase in load.

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