A.Cross
B.Parallel
C.Counter
D.Circular
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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
A.increase the amount of cooling water to the condenser
B.decrease the amount of cooling water to the condenser
C.add more refrigerant to the system
D.remove some refrigerant from the system
A.Heat is given off from a high temperature region known as a heat sink
B.Heat transfer rate is affected most by the size of the heat sink involved
C.Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink
D.Heat transfer by radiation will occur only by mass motion of a fluid substance
A.Maritime Safety Administration
B.Master of the vessel
C.Chief Engineer
D.Chief Mate
A.size of the heat sink
B.temperature difference between the regions
C.size of the heat source
D.total heat of the system
最新试题
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
When the steering gear is in operation, you should ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
The general purpose of a heat exchanger is to ().
A pressure drop through the refrigerant liquid line may cause ().
A grease gun is generally used to lubricate a ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().