A.superheated
B.saturated
C.dense
D.flooded
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A.a separate air ejector unit
B.a direct unimpeded connection between second stage and salt water feed heater
C.either by vacuum drag or an external line from the first stage via a fixed orifice
D.the fixed orifice provided in the steam supply line
A.Expansion valve
B.Evaporator
C.Drier
D.Receiver
A.using a slightly dirty air filter
B.using oil having an excessive viscosity
C.intercooler or after-cooler leaks
D.carrying the oil level higher than normal
A.increased capacity of the compressor
B.more efficient operation of the thermal expansion valve
C.decreased capacity of the compressor
D.loss of receiver capacity
A.damage to the un-loader operating diaphragm
B.an increase in current flow to the motor
C.high pressure in the receiver and filter
D.an excessive consumption of crankcase oil
A.first stage
B.second stage
C.distillate cooler
D.salt water feed heater
A.Gravity siphon effect
B.Higher vacuum in the second-stage
C.Difference in brine density between first and second stages
D.lower pressure in first-stage
A.decreased compression ratio
B.higher than normal power consumption
C.un-loader malfunction
D.water in the lubricating oil
A.reduce friction between moving surfaces
B.provide even distribution of bearing wear
C.reduce the accumulation of harmful detergents
D.maintain a constant oil temperature output at each beating
A.vapor feed heater
B.air ejector condenser
C.saltwater heater
D.distillate cooler
最新试题
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
One cause of high head pressure occurring in a refrigeration system can be ().
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
Low compressor head pressure in a refrigeration system can be caused by().
The major source of chemical contaminants in hydraulic fluid is ().
The output volume of a positive fixed displacement pump can be changed only by ().