A.increase the refrigerating effect, by decreasing the amount of flash gas
B.allow the refrigerant to enter the throttling device in a saturated condition
C.increase the refrigerating effect by increasing the amount of flash gas
D.minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
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A.maintain adequate coil back pressure
B.prohibit flashing in the liquid line
C.reduce refrigerant volume in the system
D.reduce compressor discharge line loading
A.maintaining a steadier speed
B.delivering liquids over greater distances
C.operating for longer periods of time
D.producing a smoother discharge flow
A.rolling member size
B.inner race cone width
C.manufacturers numerical code
D.outer ring width
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
最新試題
One cause of high head pressure occurring in a refrigeration system can be （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A salinity indicator is used to determine the （）.
When the steering gear is in operation, you should （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The general purpose of a heat exchanger is to （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.