單項選擇題Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

A.Sub-cooled liquid
B.Sub-cooled vapor
C.Superheated vapor
D.Liquid


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1.單項選擇題The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）

A.latent heat of expansion
B.sensible heat of condensation
C.heat of compression
D.all of the above

2.單項選擇題An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）

A.have a high viscosity index
B.mix readily with refrigerant
C.have a high freezing point
D.have a low pour point

3.單項選擇題Properties of a good refrigeration oil include（）

A.low wax content
B.high pour point
C.high viscosity
D.all of the above

4.單項選擇題Proper filtering and straining of diesel fuel is important because the（）

A.fuel oil pump will over-speed if dirt is not removed
B.fuel oil transfer pumps cannot tolerate small amounts of grit in the oil
C.fuel injectors may be damaged by foreign particles in the fuel oil dirty
D.fuel will clog the intake air filter

5.單項選擇題Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）

A.The viscosity off the fuel
B.The quantity of water to be removed from the fuel
C.The specific gravity of the fuel
D.The quantity of dirt to be removed from the fuel