A.Sea water is heated to boiling temperature while under a vacuum
B.Sea water is passed over heated plates in a thin film
C.Heated sea water is injected into a vacuum chamber
D.Sea water is forced through a heated eductor
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A.Vapor pockets formed in the suction flow stream
B.Rough easing volute surfaces
C.Worn wearing rings
D.Heavy fluid in the flow stream
A.primarily to lubricate the shaft seals
B.due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
C.to initially unload the pump by having its head pressure equal to discharge pressure
D.in order to overcome the potential energy of water in the discharge line
A.humidification
B.dehumidification
C.vaporization
D.evaporation
A.latent heat of vaporization
B.sensible heat
C.refrigerating effect
D.specific heat of vaporization
A.Ball float
B.Thermostatic
C.Bimetallic
D.Impulse
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
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 general purpose of a heat exchanger is to （）.
A pressure drop through the refrigerant liquid line may cause （）.
Which of the listed pumps is NOT a positive displacement pump?（）
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.