A.cause of salt contamination
B.location of salt water contamination
C.chemical makeup of feed-water
D.level of alkalinity in condensate
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A.restriction in refrigerant piping
B.air and non-condensable gases in the condenser
C.water in the refrigerant
D.flooding back of liquid refrigerant from the evaporator
A.A shortage of liquid refrigerant
B.Excessive frost on the evaporator
C.Excessive condenser cooling water
D.Insufficient condenser cooling water flow
A.eliminate hot air from the condenser
B.maintain steady pressure in a system
C.heat, or cool one fluid by means of another fluid
D.reduce the engine room temperature in tropical climates
A.Cross
B.Parallel
C.Counter
D.Circular
A.remain constant along the tubes length
B.be greatest in a single pass counter flow heat exchanger
C.remain constant throughout the heat exchanger
D.vary from section to section through out the heat exchanger
A.a low load on the unit
B.a clogged pump suction strainer
C.a blockage in the line between the pump and hydraulic motor
D.the hydraulic motor turning too fast
A.cause of salt contamination
B.location of salt water contamination
C.chemical makeup of feed-water
D.level of alkalinity in condensate
A.refrigerant overcharge
B.overfeeding by the expansion valve
C.a restricted suction strainer
D.due to short cycling of the compressor
A.capacity will increase
B.capacity will decrease
C.suction pressure will increase
D.suction pressure will decrease
A.hydraulic
B.electric
C.steam
D.diesel
最新试题
Which of the listed pumps is NOT a positive displacement pump?()
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
The output volume of a positive fixed displacement pump can be changed only by ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
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 ().
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 ().