A.motor overload will open
B.relief valve will open
C.pump will overheat
D.motor will overheat
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A.The liquid receiver functions to collect and remove non-condensable gases
B.A thermostatic expansion valve is used to control refrigerated space temperature
C.Refrigerant temperature in an evaporator is directly related to refrigerant pressure
D.Dehydrators must be used continuously in a refrigeration system
A.directly increase the pressure of the liquid being pumped
B.directly increase the velocity of the liquid being pumped
C.convert the potential energy of the liquid to kinetic energy
D.separate air from the liquid being pumped
A.overheated compressor bearings
B.excess lube oil viscosity
C.carbon deposits on the compressor piston rings
D.wax crystals forming in the lubricant
A.electric motor
B.volute
C.impeller
D.diffusion nozzle
A.expansion valve to overfeed
B.compressor to knock
C.water regulating valve to fail
D.crankcase drains to plug
最新試題
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
A salinity indicator is used to determine the ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
Which of the listed pumps is NOT a positive displacement pump?()
A pressure drop through the refrigerant liquid line may cause ().
The general purpose of a heat exchanger is to ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().