Commutation is delayed due to __________(a) Leakage reactance(b) Effect of armature reaction(c) Leakage reactance and armature reaction(d) Because of other factorsThis 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

Commutation is delayed due to __________(a) Leakage reactance(b) Effec

1.	Commutation is delayed due to __________(a) Leakage reactance(b) Effect of armature reaction(c) Leakage reactance and armature reaction(d) Because of other factorsThis 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
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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