The following data was observed for a CI engine: Fuel-air ratio: 0.04, Volumetric efficiency: 85%, Indicated mean effective pressure: 8 bar, Fuel calorific value: 44000 kJ/kg, Density of air: 1 kg/m3. What is the indicated thermal efficiency of this engine?

The following data was observed for a CI engine: Fuel-air ratio: 0.04,

1.	The following data was observed for a CI engine: Fuel-air ratio: 0.04, Volumetric efficiency: 85%, Indicated mean effective pressure: 8 bar, Fuel calorific value: 44000 kJ/kg, Density of air: 1 kg/m3. What is the indicated thermal efficiency of this engine?
A.	43%
B.	64%
C.	53%
D.	69%
Answer» D. 69%