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With increase in armature current, speed of the cumulative compound motor _________

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With increase in armature current, speed of the cumulative compound motor _________

(a) Reduces slowly compare to shunt motor

(b) Reduces sharply compare to shunt motor

(c) Remains constant

(d) Increases in proportionality with armature current

This question was addressed to me during an online exam.

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

1 Answer

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Correct answer is (b) Reduces sharply compare to shunt motor

For explanation: As armature current increases, the back emf decreases similar to shunt motor. By the same time series field resistance carries more armature current producing more amount of flux which is inversely proportional speed.

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