Question 3:An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95 kPa and 20C. If the maximum temperature in the cycle is not to exceed 2200 K, determine the thermal efficiency. Assume constant specific heats for air oat room temperature. Assumptions 1 The air-standard assumptions are applicable. 2 Kinetic and potential energy changes are negligible. 3 Air is an ideal gas with constant specific heats. Question 4:Simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 3 MPa in the boiler and 30 kPa in the condenser. If the quality at the exit of the turbine cannot be less than 85 percent, what is the maximum thermal efficiency this cycle can have? Assumptions 1 Steady operating conditions exist. 2 Kinetic and potential energy changes are negligible.