Air-conditioning principles are being discussed. technician a states that heat always
travels from hot to cold. technician b states that convection is heat that travels through
solids. who is correct?
a. technician a
b. technician b
c. both a and b
d. neither a nor b

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

The higher the astm grain size number, the finer the gran is. a)-true b)-false