An important consideration in selecting a lubricating oil for use in a refrigeration compressorfor the oil to( )
A. have a high viscosity index
B. mix readily with refrigerant
C. have a high freezing point
D. have a low pour point
查看答案
Subcooling increases the( )of the refrigeration cycle.
A. capacity
B. refrigeration effect
C. mass flow rate
D. volume flow rate
The temperature at which a fluid boils or condenses, is known as( )and varies withpressure.
A. saturation temperature
B. superheated temperature
C. sub-cooled temperature
D. wet bulb temperature
The boiling and condensation points of a refrigerant depend on the( )exerted upon it.
A. pressure
B. temperature
C. superheat
D. super-cool
The refrigerant entering the evaporator coil, at a temperature( )than that of thesurrounding secondary coolant ( air or brine) receives latent heat and( )
A. higher; condenses
B. lower; evaporates
C. lower; compresses
D. higher; evaporates