Question

What should be the gap of spark plug?

(a) 1.2-1.53 mm

(b) 2.5-2.85 mm

(c) 0.5-0.85 mm

(d) 3.15-3.45 mm

I got this question by my school principal while I was bunking the class.

The origin of the question is Working Principle of Battery Ignition System topic in section Ignition and Power Transmission of Farm Machinery

Answer 1

The correct answer is (b) 2.5-2.85 mm

To explain I would say: 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.