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单选题
The process of removing moisture from air is known as（）.
A
humidification
B
dehumidification
C
vaporization
D
evaporation
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共用题干
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考题
单选题When used in conjunction with a turbocharger, the main function of an after-cooler is to （）A
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remove moisture from air compressed by the turbocharger
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单选题In an air conditioning system, moisture is removed from the air by（）A
filersB
separatorsC
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单选题Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.A
pressure changes in the air massB
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单选题Clouds form（）.A
as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small dropletsB
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单选题Pressurized air enters the cylinder via the inlet ports and pushes the remaining exhaust gas from the cylinder in a process known as “（）”.A
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单选题Increasing the moisture content of conditioned air is known as （）.A
moisturizingB
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多选题Immediately after adding a new disk to or removing an existing disk from an Automatic StorageManagement （ASM） instance， you find that the performance of the database decreases initially， until the addition or removal process is completed. Performance then gradually returns to normal levels. Which two activities could you perform to maintain a consistent performance of the database while adding or removing disks？（）Aincrease the number of checkpoint processesBdefine the POWER option while adding or removing the disksCincrease the number of DBWR processes by setting up a higher value for DB_WRITER_PROCESSESDincrease the number of slave database writer processes by setting up a higher value for DBWR_IO_SLAVESEincrease the number of ASM Rebalance processes by setting up a higher value for ASM_POWER_LIMIT during the disk addition or removal process
考题
单选题In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.A
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考题
单选题The moisture equilibrium chart can be used to determine the（）.A
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单选题The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the（）.A
absolute humidityB
relative humidityC
specific humidityD
total humidity
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单选题The purpose of an air compressor unloading device is to （）A
drain water from the air receiverB
drain water from the cylindersC
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单选题The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called （）.A
absolute humidityB
specific humidityC
effective humidityD
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单选题If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.A
combustion control air systemB
supply air systemC
ships service air systemD
low pressure deck air system
考题
单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）A
Reduce engine speed to idle before removing the filterB
Soak the dirty filter in kerosene onlyC
Blow out the air inlet with compressed airD
Cover the air inlet after removing the filter
考题
单选题In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.A
scavenging air ports；exhaust portsB
inlet ports；scavenging air portsC
scavenging air ports；inlet portsD
exhaust ports；inlet ports
考题
单选题Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）A
Cooling the air to a temperature just above dew pointB
Heating the air to a point at which moisture will boil off ,then re-cooling itC
Cooling the air to a point below dew point, then reheating itD
Heating the air and then cooling it to a point below dew point
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单选题By far the greatest item of maintenance of the reciprocating air compressors concerns （）.A
the lubricationB
the coolingC
the moisture separationD
the valves
考题
单选题Hot air can hold（）.A
less moisture than cold airB
more moisture than cold airC
the same amount of moisture as cold airD
moisture independent of air temperature
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单选题If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.A
control air systemB
forced draft air systemC
supply air systemD
ships service air system
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