How can the center electrode make concerning earth to increase the plug life?(a) Positive(b) Negative(c) Short circuit(d) GroundI have been asked this question during a job interview.I'd like to ask this question from Types of Ignition System topic in chapter Conventional Ignition System of Automotive Engine Design

How can the center electrode make concerning earth to increase the plu

1.	How can the center electrode make concerning earth to increase the plug life?(a) Positive(b) Negative(c) Short circuit(d) GroundI have been asked this question during a job interview.I'd like to ask this question from Types of Ignition System topic in chapter Conventional Ignition System of Automotive Engine Design
Answer» Right answer is (B) Negative Explanation: The advantage of negative earth type is that comparatively less voltage is required for the electrons to JUMP from the central electrode which is HOTTER than the outer electrode. Further, the CENTER electrode is made negative CONCERNING the earth, thus the plug life is increased.

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