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Commutation is delayed due to __________

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Commutation is delayed due to __________

(a) Leakage reactance

(b) Effect of armature reaction

(c) Leakage reactance and armature reaction

(d) Because of other factors

This question was addressed to me during an online interview.

The question is from Commutation Process -1 in section Commutation Process & Excitation Methods of DC Machines

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Best answer
The correct option is (c) Leakage reactance and armature reaction

Explanation: The leakage inductance Lc of the coil undergoing commutation has induced in it reactance voltage Lc (dic/dt) which opposes the change in current thereby delaying commutation. The effect of armature reaction causes shift in MNA, delaying the whole commutation process ultimately.

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