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
Answer: a
Explanation: 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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