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单选题
When air is at its dew point it is at its()
A

lowest absolute humidity

B

lowest relative humidity

C

highest absolute humidity

D

highest relative humidity


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考题 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

考题 Hygroscopic cargoes should be ventilated when ______.A.going from a warm to a cold climateB.the dew point of the outside air is greater than the dew point of the air in the holdC.the dew point of the air in the hold is very lowD.the outside dew point is 16°C and the cargo temperature is 12°C

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考题 Fog is likely to occur when there is little difference between the dew point and the ______.A.relative humidityB.air temperatureC.barometric pressureD.absolute humidity

考题 单选题What occurs when rising air cools the dew point?()A advection fog formsB humidity decreaseC wind increaseD Cloud form

考题 单选题The dew point of air is reached when the wet bulb temperature is ().A Twice the dry bulb temperatureB 10℃ above the dry bulb temperatureC 5℃ above the dry bulb temperatureD Equal to the dry bulb temperature

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考题 单选题When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its()A suction strokeB compression strokeC power strokeD exhaust stroke

考题 单选题The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its ().A BDCB TDCC BBDCD ATDC

考题 单选题When air is at its dew point it is at its()A lowest absolute humidityB lowest relative humidityC highest absolute humidityD highest relative humidity

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考题 单选题Obviously, for a given fuel oil, its pour point is () its cloud point.A lower thanB higher thanC as same asD better than

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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

考题 单选题Hygroscopic cargoes should be ventilated when().A going from a warm to a cold climateB the dew point of the outside air is greater than the dew point of the air in the holdC the dew point of the air in the hold is very lowD the outside dew point is 16°C and the cargo temperature is 12°C

考题 单选题Hygroscopic cargoes should be ventilated when().A going from a warm to a cold climateB the dew point of the outside air is greater than the dew point of the air in the holdC the dew point of the air in the hold is very lowD the outside dew point is 16℃ and the cargo temperature is 12℃

考题 单选题When the dew point of the outside air is lower than or equal to the dew point of the air in the cargo hold,you should().A secure all ventilationB shut down the exhaust blowersC shut down the intake blowersD ventilate the cargo holds

考题 单选题When air is at its dew point it().A will contain no additional moistureB has the lowest relative humidityC cannot keep up its moistureD has a low absolute humidity