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Which of the following material is used to fill the space between the plug electrodes in a surface discharge plug?

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in Automotive Engine Design by (137k points)
Which of the following material is used to fill the space between the plug electrodes in a surface discharge plug?

(a) Semiconductor

(b) Plastic

(c) Rubber

(d) Wood

This question was posed to me in an interview.

The above asked question is from Conventional Ignition System topic in portion Conventional Ignition System of Automotive Engine Design

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Best answer
The correct option is (a) Semiconductor

Best explanation: Surface discharge plug is a special type of spark plug where the space between the plug electrodes is filled with some semiconductor material. Thus the spark has to jump across this material instead of air in the ordinary plugs.

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