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

Which of the following statements regarding a Rankine cycle with reheating are TRUE? (a) increase in average temperature of heat addition (b) reduction in thermal efficiency (c) drier steam at the turbine exit :

The ideal vapour-compression refrigeration cycle is not a reversible cycle becauseQuestion 1Select one or more:a.heat input is not isothermal across an infinitesimal temperature differenceb.the ideal compression process is non-isentropicc.heat rejection is not isothermal across an infinitesimal temperature differenced.expansion process through the throttling valve is irreversiblee.phase changes that occurring during heat input and output cannot be reversed

Reheating increases the enthalpy and entropy of the steam entering the turbine which allows more power to be extracted from the turbine for a given condenser pressure. Wouldn't simply superheating the inlet to a single turbine have the same effect?Question 3Select one:a.No superheating will require the addition of more heatb.No super heating will increase the entropy but it will not increase the enthalpyc.Yes both will have the same effects but superheating would reduce the quality of steam in the turbined.Yes but superheating would involve a higher turbine inlet temperaturee.Yes but superheating will not allow the use of inter-cooling

When a simple Rankine cycle is modified to include reheating for the same mass flowQuestion 1Select one:a.the pump work remains the same, the heat supplied is increased, the heat rejected is increased, the total turbine work increases, and the quality of steam leaving the turbine decreasesb.the pump work remains the same, the heat supplied is increased, the heat rejected stays the same, the total turbine work increases, and the quality of steam leaving the turbine decreasesc.the pump work remains the same, the heat supplied is increased, the heat rejected is increased, the total turbine work increases, and the quality of steam leaving the turbine increasesd.the pump work remains the same, the heat supplied remains the same, the heat rejected is increased, the total turbine work increases, and the quality of steam leaving the turbine increasese.the pump work remains the same, the heat supplied remains increases, the heat rejected stays the same, the total turbine work increases, and the quality of steam leaving the turbine increases

Which of the following statements are true regarding throttling valves?Group of answer choicesThrottle valves are flow restricting devices that cause a pressure drop in a fluid.The pressure drops across a throttle valve is often accompanied by a large increase in temperature.The flow through a throttle valve may be assumed to be adiabatic.Since pressure drops across a throttle valve, work cannot be neglected.For a single stream, steady flow throttle valve, the inlet and outlet enthalpies can be approximated to be the same.