A.Production of high salinity distillate
B.Seawater feed temperature below 165℃
C.A leak in the first stage demister
D.A cracked distillate pump vent line
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A.Latent heat of vaporization
B.Heat of compression
C.Superheat
D.All of the above
A.Solar gain
B.Infiltration and ventilation air
C.Occupants inside the space
D.Entertainment equipment within the space
A.The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
B.Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
C.Rotary pumps occupy only one-half the space of reciprocating pumps
D.Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
A.misalignment or worn main bearings
B.insufficient cylinder lubrication
C.defective or poorly fitted valves
D.all of the above
A.They make it easier to replace the pump shaft packing
B.They can be economically replaced as they wear out
C.They can be removed when it is necessary to lighten the weight of the pump
D.They increase the strength of the shaft
最新試題
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
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 （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.