When modelling an IC engine as a cold-air Otto Cycle which of the following assumptions are made (more than one correct answer)Question 3Select one or more:a.working fluid is air (only)b.working fluid circulates in a closed loopc.exhaust is represented by a heat rejection processd.expansion and compression processes are isothermale.working fluid maintains a constant Cp and Cv

In an ideal Otto cycle, air is compressed from 1.15 kg/m3 and 2.2 L to 0.26 L, and the net work output of the cycle is 620 kJ/kg. The mean effective pressure (MEP) for this cycle isQuestion 8Select one:a.713 kPab.807 kPac.638 kPad.96 kPae.367 kPaClear my choiceCheckQuestion 8

Select all of the ways in which a process can be adiabatic.Group of answer choicesThe system is well insulated.The system is at the same temperatures as the surroundings.The system does not change temperature during the process.No work crosses the system boundary

Consider an ideal Brayton cycle executed between the pressure limits of 1100 kPa and 100 kPa and temperature limits of 20 deg C and 1200 deg C with argon (k = 1.667, cp = 0.5203 kJ/kg.K) as the working fluid. The net work output of the cycle isQuestion 10Select one:a.136 kJ/kgb.96 kJ/kgc.227 kJ/kgd.439 kJ/kge.456 kJ/kg

Select all of the ways in which a process can be adiabatic.Group of answer choicesThe system is well insulated.The system does not change temperature during the process.The system is at the same temperatures as the surroundings.No work crosses the system boundary

A throttling valve is used in the ideal refrigeration cycle because ____________Question 5Select one:a.it is impossible to expand a liquid vapour mixture with a turbineb.the use of a turbine would require more work input to operatec.the use of a turbine improves the cooling power of the cycle, but would substantially increase the cost and complexityd.it provides an increase in entropy which corresponds to an additional heat input from the low temperature reservoir