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The speed of a DC shunt motor can be made more than full load speed by __________

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The speed of a DC shunt motor can be made more than full load speed by __________

(a) Reducing the field current

(b) Decreasing the armature current

(c) Increasing the armature current

(d) Increasing the excitation current

The question was asked during an online exam.

Question is from Speed Control Using Field Control of Shunt Motor topic in section DC Motors of DC Machines

1 Answer

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Best answer
Right answer is (a) Reducing the field current

To explain I would say: Speed of the DC motor obtained from speed equation is inversely proportional to flux produced by the field. So, reducing the field current flux produced by armature will decrease, and speed will increase.

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