question_answer

Consider the following statements: Detonation in the S.I. engine can be suppressed by

1. Retarding the spark timing

2. Increasing the engine speed.

3. Using 10% rich mixture.

Of these statements:

A) 1 and 3 are correct

B) 2 and 3 are correct

C) 1, 2 and 3 are correct

D) 1 and 2 are correct