A.They are particularly suited for pumping high viscosity fluids
B.They are started with the discharge valve opened
C.The flow of liquid is developed by imparting energy due to the rotation of an impeller
D.They are always mounted in a horizontal position
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A.refrigerant pressure in the evaporator
B.cooling water temperature to the condenser
C.heat load in the refrigerator compartment
D.solenoid valve in the liquid line
A.compressor
B.condenser
C.expansion valve
D.evaporator
A.bimetallic type
B.diaphragm type
C.bourdon tube type
D.resistance-temperature type
A.evaporator coils
B.liquid strainer
C.compressor
D.condenser
A.suction side of a bilge pump
B.exhaust manifold of an auxiliary diesel
C.discharge line from an air compressor
D.chemical feed tank of an evaporator
A.They should always be started with the discharge valve closed
B.They should always be started with the discharge valve opened
C.A priming pump is always required to flood the impeller suction
D.They should always be started with the sealing line valves closed
A.compressor damage from improper lubrication
B.refrigerant absorption by the lubricant
C.increased viscosity in the lubricant
D.carbon deposit on the compressor suction valves
A.Spring-centered valve
B.Unloading valve
C.Three-position valve
D.Two-position valve
A.Expansion valve
B.Condenser
C.Evaporator
D.Compressor
A.The condenser and the expansion valve
B.The king valve and the solenoid valve
C.The compressor and the expansion valve
D.The condenser and the solenoid valve
最新试题
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
Which of the listed pumps is NOT a positive displacement pump?()
The output volume of a positive fixed displacement pump can be changed only by ().
When the steering gear is in operation, you should ().
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
Low compressor head pressure in a refrigeration system can be caused by().
The major source of chemical contaminants in hydraulic fluid is ().