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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
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更多 “ 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 ” 相关考题
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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()
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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
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单选题As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.A
increaseB
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remain unchangedD
be greatest at dew point
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单选题One advantage of dry cylinder liners used in a diesel engine is the（）A
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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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单选题The dew point temperature is（）.A
always higher than the air temperatureB
always lower than the air temperatureC
equal to the difference between the wet and dry bulb temperaturesD
the temperature at which the air is saturated with water vapor
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单选题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
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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 （）.A
cooling onlyB
cooling and humidifyingC
cooling and dehumidifyingD
adiabatic cooling
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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 （）A
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increaseC
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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 （）A
admit only enough fresh outside air to provide proper ventilationB
reduce the air reheating system loadC
lower the compressor head pressureD
operate the purge recovery unit continuously
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单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）A
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The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityC
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureD
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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 （）.A
atmospheric pressureB
wind speedC
relative humidity and dew pointD
wind chill factor
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单选题The latent heat of water vapor in air is dependent upon the （）A
dry bulb temperatureB
wet bulb temperatureC
dew pointD
dry point
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单选题A sling psychrometer is used to measure（）.A
seawater temperatureB
engine temperatureC
dry bulb and wet bulb temperaturesD
barometric pressure
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单选题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
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单选题The sensible heat of air is dependent upon the （）.A
dry bulb temperatureB
wet bulb temperatureC
saturation temperatureD
water vapor superheat
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单选题The inside light in an inflatable liferaft is turned on（）.A
automatically as the liferaft inflatesB
with a switch near the boarding handleC
at night because the light has a photosensitive switchD
by screwing the bulb in after the raft is inflated
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