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
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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
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
最新试题
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
The general purpose of a heat exchanger is to ().
A salinity indicator is used to determine the ().
Which of the listed pumps is NOT a positive displacement pump?()
The output volume of a positive fixed displacement pump can be changed only by ().
One cause of high head pressure occurring in a refrigeration system can be ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
Low compressor head pressure in a refrigeration system can be caused by().
A salinity indicator is used to determine the ().