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For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is _________

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in Machine Dynamics by (34.3k points)
For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is _________

(a) 0.5

(b) 1.5

(c) 2

(d) 0.66

This question was addressed to me by my school teacher while I was bunking the class.

My enquiry is from Turning Moment Diagram for a Multicylinder Engine in portion Turning Moment Diagrams and Flywheel of Machine Dynamics

1 Answer

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by (38.6k points)
Correct answer is (d) 0.66

The best explanation: Let N be the maximum speed, then minimum speed is N/2

mean speed = (N+N/2)/2 = 3N/4

Maximum fluctuation = N – N/2 = N/2

therefore coefficient of fluctuation = 2/3.

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