Question

A petrol engine used to mix petrol and air in certain ratio for combustion, is called _

Answer 1

What is the air-fuel ratio in a petrol engine?

For proper burning/combustion of fuel(petrol) engine require oxygen, and this oxygen is supplied to engine by atmospheric air. The ratio of mass of air sucked by engine to mass of fuel injected is air-fuel ratio. If exactly enough air is provided to completely burn all of the fuel, the ratio is known as the Stoichiometric mixture or Stoichiometric air-fuel ratio. Stoichiometric air-fuel ratio for petrol(SI engine)is 14.5:1 . A/F ratio less than 14.5 means rich mixture and A/F ratio greater than 14.5 means lean mixture.

For cold starting (simply when your engine parts are not warmed)- 9:1 (rich of fuel)

For Idling(when you stop at signal without turning off engine)- 12:1 (rich mixture)

for cruising (when you run engine at constant medium/economy speed)- 16:1(lean mixture)

When you accelerate bike/car - 13:1 (Rich mixture but require less fuel than idling)

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Answer 2

The part of a petrol engine used to mix petrol and air in a certain ratio for combustion, is called a carburetor.

• The name of the device 'carburetor' derives its roots from the word 'carburate' which means- to mix air and fuel in an engine for the purpose of combustion.

• The carburetor was invented by Samuel Morey in 1826. It was a surface carburetor that passed air above the exposed fuel to pick up fuel vapors for combustion.

• The carburetor works on Bernoulli's principle- the faster the air flows, the lower its static pressure, and the higher its dynamic pressure.

• The throttle of the vehicle activates the working of the carburetor, which causes the airflow over the fuel in the engine to increase in speed when the vehicle is accelerated.

• Hence, the carburetor is a device based on simple principles and is essential to the functioning of vehicles.

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