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
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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
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
One cause of high head pressure occurring in a refrigeration system can be （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The general purpose of a heat exchanger is to （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.