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Knocking is also called as __________

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Knocking is also called as __________

(a) cracking

(b) pinging

(c) doping

(d) crushing

I got this question in a job interview.

The question is from Cracking and Knocking of Petroleum topic in section Fuel Technologies of Applied Chemistry

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The correct option is (b) pinging

The explanation: Pinging is the other name of knocking. Cracking means the process of breaking the higher hydrocarbons into simple atoms. Doping means adding impurity to a pure metal to improve its conductivity. Crushing means divided into small pieces.

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