A.rolling member size
B.inner race cone width
C.manufacturers numerical code
D.outer ring width
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A.mechanical energy to kinetic energy to potential energy
B.mechanical energy to potential energy to kinetic energy
C.potential energy to mechanical energy to kinetic energy
D.kinetic energy to mechanical energy to potential energy
A.The wearing rings are excessively worn
B.The suction strainer is clogged
C.The discharge valve is clogged
D.The shaft is worn
A.sudden evaporation of wax crystals in the lubricant
B.sudden evaporation of entrapped air in the lubricant
C.release of refrigerant from the oil/refrigerant mixture
D.release of dissolved lubricant from the refrigerant
A.motor overload will open
B.relief valve will open
C.pump will overheat
D.motor will overheat
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
最新試題
Which of the listed pumps is NOT a positive displacement pump?（）
When the steering gear is in operation, you should （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Thermostatic expansion valves can be adjusted for （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The general purpose of a heat exchanger is to （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.