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In which type of air filter at idling or cold start condition the incoming air is heated and then sent to the cleaner?

(a) Heavy-duty type air cleaner

(b) Light duty type air cleaner

(c) Thermostatic control of air cleaner

(d) Heavy-duty type air cleaner and Light duty type air cleaner

This question was addressed to me in an online quiz.

My question is taken from Petrol Engine Fuel Supply System in portion Petrol Engine Fuel Supply System of Automotive Engine Design

1 Answer

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Best answer
Right option is (c) Thermostatic control of air cleaner

The best explanation: In the modern engine the lean fuel-air is used to reduce the pollution due to which efficiency decreases, therefore, to remedy this the incoming air is heated and then sent to the air cleaner.

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