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Which of the following is not the main part of a spark plug?

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in Automotive Engine Design by (137k points)
Which of the following is not the main part of a spark plug?

(a) The center electrode

(b) The ground electrode

(c) Distributor cap

(d) The insulator

I got this question at a job interview.

This intriguing question comes from Conventional Ignition System topic in chapter Conventional Ignition System of Automotive Engine Design

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Best answer
Right answer is (d) The insulator

Best explanation: The spark plug has three main parts, the center electrode, the ground electrode, and the insulator separating them. Besides these, there are the body shell, the sealing ring, and the gasket washer. The distributor cap is not a main part of the spark plug.

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