A.Lobe
B.Screw
C.Radial piston
D.Volute
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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
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
最新试题
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
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 ().
A grease gun is generally used to lubricate a ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
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 ().