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__________________ causes knocking.

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in Chemical Technology by (61.8k points)
__________________ causes knocking.

(a) Low expansion

(b) Low compression

(c) High expansion

(d) High compression

The question was posed to me in an online quiz.

My query is from Natural Products topic in portion Natural Products of Chemical Technology

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Best answer
Right option is (d) High compression

To explain I would say: High compression is the cause of knocking effect. Some anti-knocking agents are used such as lead tetra methyl, lead tetra ethyl and so on which slow down the burning rate and hence reduce the knocking effect.

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