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In which type of muffler series of resonators are connected?

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in Automotive Engine Design by (137k points)
In which type of muffler series of resonators are connected?

(a) Baffle type

(b) Wave cancellation type

(c) Resonance type

(d) Absorber type

I had been asked this question in a national level competition.

This interesting question is from Exhaust System topic in section Exhaust System & Petrol Engine Fuel Supply System of Automotive Engine Design

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Right choice is (c) Resonance type

Explanation: Resonance type muffler is also called a Helmholtz type, after the person who originated the idea. It consists of several Helmholtz resonators in series. Series of resonators eliminate the fundamental and higher harmonics of the engine noise.

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