A single cylinder, 4-stroke diesel engine running at 1800 rpm has a bore of 85 mm and a stroke of 110 mm. It takes 0.56 kg of air per minute and develops a brake power output of 6 kW while the air fuel ratio is 20:1. The calorific value of the fuel used is 42550 kJ/kg and the ambient air density is 1.18 kg/m3. Calculate
(a) The volumetric efficiency, and
(b) Brake specific fuel consumption