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Which of the following is used as a material for the body shell of the spark plug?(a) Low carbon steel(b) Ceramic(c) Paper(d) WoodThe question was asked in an online interview.The origin of the question is Conventional Ignition System in division Conventional Ignition System of Automotive Engine Design

Answer»

The correct choice is (a) Low carbon steel

The best explanation: The BODY SHELL is generally made of low carbon steel. The body is FORMED by impact extrusion. The threads are cold rolled to provide a low friction profile. Porcelain was used initially for INSULATION, but this has a disadvantage of brittleness and low resistance.



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