Question

The air requirement of a petrol engine during staring compared to theoretical air required for complete combustion is

• A. more
• B. loss
• C. same
• D. may be more or less depending on the engine capacity

Answer 1

The correct option is B loss

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.

The air requirement of a petrol engine during staring compared to theoretical air required for complete combustion is less