Question

Find the weight of air for complete combustion of 10 l of petrol, assuming air contains 22.7%

(a) 113.66 kg

(b) 171 kg

(c) 450.12 kg

(d) 650 kg

This question was posed to me during an interview.

The query is from Fuel Supply System in Ignition or Diesel Engine topic in chapter Ignition and Power Transmission of Farm Machinery

Answer 1

Correct option is (a) 113.66 kg

For explanation I would say: 10 l of petrol = 7300 g

2*86 g of petrol requires = 19*32 kg of oxygen

7300 g of petrol requires = \(\frac{19*32*7300}{2*86}\) = 25.80 kg

Amount of air required = 25.80 * 100/22.7 = 113.66.