Propane is used in a vapor-compression refrigeration system for a household refrigerator that has a refrigerating capacity of 900 btu/h. refrigerant enters the evaporator at -15°f and exits at 20°f. the isentropic compressor efficiency is 75%. the refrigerant condenses at 110°f and exits the condenser subcooled at 100°f. there are no significant pressure drops in the flows through the evaporator and condenser. determine the evaporator and condenser pressures, each in lbf/in2 , the mass flow rate of refrigerant, in lb/min, the compressor power input, in horsepower, and the coefficient of performance

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.