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In which type of excitation air gap flux increases with armature current?

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In which type of excitation air gap flux increases with armature current?

(a) Differential compound

(b) Cumulative compound

(c) Differential and Cumulative

(d) Cannot be determined

The question was asked in semester exam.

Question is taken from Methods of Excitation topic in division Commutation Process & Excitation Methods of DC Machines

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The correct option is (b) Cumulative compound

Easiest explanation: In compound excitation both shunt and series field are excited. If the two field aid each other (their ampere-turn is additive), the excited is called cumulative compound. The shunt field is much stronger than the series field. The air gap flux increases with armature current.

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