A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the ______.A.atmospheric pressureB.wind speedC.relative humidity and dew pointD.wind chill factor
A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the ______.
A.atmospheric pressure
B.wind speed
C.relative humidity and dew point
D.wind chill factor
相关考题：
If air at 95°Cdry bulb temperature and 50%relative humidity is conditioned to 75°Cdry bulb temperature and 50%relative humidity, it is an example of() A.cooling onlyB.cooling and humidifyingC.cooling and dehumidifyingD.adiabatic(绝热的)cooling
Edison invented the light bulb many years ago（改为被动语态）The light bulb__________ __________by Edison many years ago．
As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will ______.A.increaseB.decreaseC.remain unchangedD.be greatest at dew point
Which can be prevented only by segregating two lots of cargo into separate holds?A.Contamination of dry cargo by a wet cargoB.Contamination of a clean cargo by a dirty cargoC.Contamination of a food cargo by an odorous cargoD.Overcarriage，overstowage，and short landing
A sling psychrometer is used to measure ______.A.seawater temperatureB.engine temperatureC.dry bulb and wet bulb temperaturesD.barometric pressure
A fire starting by spontaneous combustion can be expected in which condition? ______.A.Paints, varnish, or other liquid flammables are stowed in a dry stores lockerB.Inert cargoes such as pig iron are loaded in a wet conditionC.Oily rags are stowed in a metal pailD.Clean mattresses are stored in contact with an electric light bulb
湿货要远离干货。（）A、Wet cargo must be kept away from dry cargo.B、Heavy cargo must be kept away from dry cargo.C、Light cargo must be kept away from dry cargo.D、Wet cargo must be kept away from light cargo.
单选题As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.AincreaseBdecreaseCremain unchangedDbe greatest at dew point
单选题One advantage of dry cylinder liners used in a diesel engine is the（）Alower thermal expansion rates than wet linersBgreater heat transfer rate than wet linersCgreater wear resistance than wet linersDprocedure to replace dry liners is simpler than for wet liners
单选题The dew point of air is reached when the wet bulb temperature is （）.ATwice the dry bulb temperatureB10℃ above the dry bulb temperatureC5℃ above the dry bulb temperatureDEqual to the dry bulb temperature
单选题The dew point temperature is（）.Aalways higher than the air temperatureBalways lower than the air temperatureCequal to the difference between the wet and dry bulb temperaturesDthe temperature at which the air is saturated with water vapor
单选题Which can be prevented only by segregating two lots of cargo into separate holds? （）AContamination of dry cargo by a wet cargoBContamination of a clean cargo by a dirty cargoCContamination of a food cargo by an odorous cargoDOvercarriage，overstowage，and short landing
单选题If air at 95℃ dry bulb temperature and 50% relative humidity is conditioned to 75℃ dry bulb temperature and 50% relative humidity, it is an example of （）.Acooling onlyBcooling and humidifyingCcooling and dehumidifyingDadiabatic cooling
单选题A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）AdecreaseBincreaseCdecrease to zeroDremain unchanged
单选题To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）Aadmit only enough fresh outside air to provide proper ventilationBreduce the air reheating system loadClower the compressor head pressureDoperate the purge recovery unit continuously
单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）AAt the designed operating temperature, the liquid refrigerant charge has changed to a vaporBThe liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityCThe sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureDThe sensing bulb is never emptied of liquid refrigerant under normal operating conditions
单选题The distance from which a certain light is visible is directly proportional to the wattage of the light bulb. If the light is visible from 16 meters when a 40 watt bulb is used, from what distance is the light visible when a 75 watt bulb is used?A30 metersB35 metersC51 metersD89 metersE91 meters
单选题A feeler or thermal bulb is used for the expansion valve to （）.Adetect the temperatureBdetect the pressureCheat the refrigerantDaccelerate the refrigerant
单选题A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the （）.Aatmospheric pressureBwind speedCrelative humidity and dew pointDwind chill factor
单选题The latent heat of water vapor in air is dependent upon the （）Adry bulb temperatureBwet bulb temperatureCdew pointDdry point
单选题A sling psychrometer is used to measure（）.Aseawater temperatureBengine temperatureCdry bulb and wet bulb temperaturesDbarometric pressure
单选题A fire starting by spontaneous combustion can be expected in which condition?（）.APaints, varnish, or other liquid flammables are stowed in a dry stores lockerBInert cargoes such as pig iron are loaded in a wet conditionCOily rags are stowed in a metal pailDClean mattresses are stored in contact with an electric light bulb
单选题The sensible heat of air is dependent upon the （）.Adry bulb temperatureBwet bulb temperatureCsaturation temperatureDwater vapor superheat
单选题The inside light in an inflatable liferaft is turned on（）.Aautomatically as the liferaft inflatesBwith a switch near the boarding handleCat night because the light has a photosensitive switchDby screwing the bulb in after the raft is inflated