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Q. Using a diesel fired boiler with an efficiency of 80%.How many liters of diesel is required to produce 1000kg of steam at 120degrees Celsius from make up water at 20 degrees Celsius.given that the enthalpy of steam at 120 degrees Celsius is 2706.3kJ/kg,enthalpy of water at 20 degrees Celsius is 83.9kJ/kg, heat of combustion of diesel is 45000J/kg and density of diesel is 850kg/m3?

Q. The emissivity of tungsten is 0.35. A tungsten sphere with a radius of 1.50cm is suspended within a large evacuated enclosure whose walls are at 290K. What power input is required to maintain the sphere at a temperature of 3000K if heat conduction along the support is neglected?

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