Find the air-fuel ratio of a 4-stroke, 1 cylinder, air cooled engine with fuel

consumption time for 10 cc as 20.0 sec. and air consumption time for 0.1 m³ as

16.3 sec. The load is 16 kg at speed of 3000 rpm. Also find brake specific fuel

consumption in g/kWh and thermal brake efficiency. Assume the density of air as

1.175 kg/m³ and specific gravity of fuel to be 0.7. The lower heating value of fuel

is 44 MJ/kg and the dynamometer constant is 5000.