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Which of the following describes the firing interval in a four-stroke engine?

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Which of the following describes the firing interval in a four-stroke engine?

(a) F.I. = 720°/Number of cylinders

(b) F.I. = 360°/Number of cylinders

(c) F.I. = 270°/Number of cylinders

(d) F.I. = 180°/Number of cylinders

This question was posed to me at a job interview.

This question is from I.C Engine in portion Internal Combustion Engine of Farm Machinery

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Right choice is (a) F.I. = 720°/Number of cylinders

For explanation I would say: The interval between successive power strokes in different cylinders of the engine is called firing intervals. During the first 180° rotation of crankshaft, the cylinder 1 gets the power stroke, cylinder 2 gets the compression stroke and cylinder 3 & 4 gets the exhaust and suction stroke respectively.

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