A.superheated
B.super-cooled
C.at or below the dew point
D.All of the above
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A.open the steam line mot valve
B.drain the steam cylinder
C.close the steam cylinder drains
D.open the liquid cylinder drains
A.rudder will respond sluggishly
B.hydraulic rams will over-speed
C.sight glass will show bubbles
D.ram relief valves will lift
A.continuous running of the compressor
B.high suction pressure
C.high discharge pressure
D.short cycling of the compressor on the water failure switch
A.the cooling effect of the condensate reduces the compressors efficiency
B.a danger of explosion exists whenever water is present in a compressor
C.water causes erratic operation of pneumatic components
D.the volumetric capacity of the first stage is reduced if water remains
A.the compressor short cycling on high pressure cut out switch
B.high suction pressure
C.high head pressure
D.bubbles in the sight glass
A.The two objects must be in physical contact
B.The two objects must be the same size
C.There must be an existing temperature differential
D.There must be an existing weight differential
A.insufficient lubrication
B.insufficient refrigerant
C.excess refrigerant
D.excessive opening of the expansion valve
A.increase compressor discharge pressure on demand
B.increase compressor operating speed as necessary
C.allow the motor to turn the compressor opposed only by friction
D.reduce the compressor frictional load when starting
A.Radiation
B.Conduction
C.Convection
D.Each of the above
A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve
最新试题
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().
The usual symptoms of cavitation in a centrifugal pump is ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
The major source of chemical contaminants in hydraulic fluid is ().
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 ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().