1. Mechanical Engineering
  2. Automobile Engineering
  3. In S.I. engine if the spark plug deposit...
Q.

In S.I. engine if the spark plug deposit indicates black coating of soot, it therefore indicates that the engine has been generally operating on

A. Too rich mixture
B. Most economical mixture
C. Too lean mixture
D. Slightly rich mixture
E. Stoichiometric mixture
Answer» A. Too rich mixture
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