Exhaust pipes of engines are covered with insulating material in order to _______

  1. Keep the exhaust pipe warm
  2. Increase engine efficiency
  3. Reduce heat transfer
  4. Conserve heat

Answer (Detailed Solution Below)

Option 3 : Reduce heat transfer
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Exhaust Pipe: The exhaust pipe takes the burning gases from the exhaust manifold. The silencer pipes are fitted under the chassis body to lead the exhaust gases away from the manifold. The silencer pipes are mounted with flexible connection to the chassis or body of the vehicle. The flexible connection prevents from damages by heavy jerks or rough up and down movement of the vehicles. 

The coating on Exhaust Pipe: Ceramic coating is capable of withstanding of high temperature and it has very good chemical and corrosion resistance and possesses excellent thermal barrier characteristics, providing a dramatic reduction in radiated heat. Its self-cleaning properties last for up to 5 years. Ceramic coatings contain the gaseous heat within exhaust pipes. The causes the gasses to heat up and expand as a result exhaust flow is boosted.

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