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If the critical commutation time is 2 ms but it was observed that the practical commutation took 2.5 ms. This is the case of __________

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If the critical commutation time is 2 ms but it was observed that the practical commutation took 2.5 ms. This is the case of __________

(a) under commutation

(b) over commutation

(c) critical commutation

(d) none of the mentioned

The question was posed to me in quiz.

My doubt is from Effect of Brush Shift and Compensation Windings topic in section DC Machines of Electrical Machines

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The correct answer is (a) under commutation

To explain I would say: Since the time taken is more than the prescribed time limit for the commutation, it is under commutation.

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