A four-cylinder, four-stroke, 1.6-L gasoline engine operates on the Otto cycle with a compression ratio of 11. The air is at 100 kPa and 37°C at the beginning of the compression process, and the maximum pressure in the cycle is 8 MPa. The compression and expansion processes may be modeled as polytropic with a polytropic constant of 1.3. Using constant specific heats at 850 K, determine the specific fuel consumption, in g/kWh, defined as the ratio of the mass of the fuel consumed to the net work produced. The air– fuel ratio, defined as the amount of air divided by the amount of fuel intake, is 16.

A Carnot Power Cycle Operates on 2 lb of air between the limits of 70°F and 500°F . The pressure at the beginning of the isothermal expansion is 400 psia and at the end of isothermal expansion is 185 psig. Determine a.the volume at the end of the isothermal compression b.Change in entropy during the isothermal process c.heat added

3. In a gas turbine plant air is compressed from 1.01 bar and 15 °C through a pressure ratio of 5. It is then heated in a combustion chamber at constant pressure to a temperature of 700 °C and expanded to atmospheric pressure in a turbine. The isentropic efficiencies of compression and expansion are respectively 0.8 and 0.85. Calculate (a) the cycle efficiency and (b) the work ratio. Assume that the properties of air do not change with temperature and may be taken as Cp = 1.005 kJ/kg K and y = 1.4.

In a Diesel cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.85 L. The displaced volume of the cycle is 0.78 L, the temperature at the end of the compression process is 690 K, the pressure at the end of the expansion process is 2.32 bar, the specific heat ratio is =1.32, the specific heat at constant volume Cv = 0.75 kJ/kg.K and the gas constant is 287 J/kg.K for air. The compression ratio is: Choose. The specific heat at constant pressure in kJ/kg.K is: Choose. The maximum temperature of the cycle in K is: Choose. The temperature at the end of the expansion process of the cycle in K is: Choose.. the heat rejected in kJ/kg of air is: Choose.