a) 1.2-1.53 mm
b) 2.5-2.85 mm
c) 0.5-0.85 mm
d) 3.15-3.45 mm
Answer: b
Explanation: In I.C. engine, the function of spark plug id to make jump of high voltage current and to ignite the mixture, i.e., charge, within the cylinder. It is used in petrol engines. the gap of spark plug should be 2.5-2.85 mm.
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