更多"As the temperature for a given mass"的相关试题:
[单项选择]As the temperature for a given mass of air increase, the（）.
A. dew point increase
B. dew point decreases
C. relative humidity increases
D. relative humidity decreases
[单项选择]As the temperature of an air mass decreases，the（）.
A. absolute humidity decreases
B. relative humidity increases
C. specific humidity decreases
D. dew point rises
[单项选择]The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the（）.
A. precipitation point
B. vapor point
C. dew point
D. absolute humidity
[单项选择]As the temperature of the air reaches the dew point，（）.
A. rain must develop
B. fog may form
C. it begins to snow
D. water freezes
[单项选择]With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.
A. increase the exhaust temperature
B. increase the power of
C. reduce the speed
D. increase the fuel consumption
[单项选择]
The effective temperature of air is dependent upon（）
Ⅰ.relative humidity
Ⅱ.air velocity
A. Ⅰonly
B. Ⅱonly
C. Both Ⅰand Ⅱ
D. NeitherⅠnor Ⅱ
[单项选择]Higher than normal temperature air passing through the intake of a diesel engine will result in（）
A. greater overall efficiency
B. greater fuel economy
C. lower horsepower
D. lower compression ratio
[单项选择]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 humidity
B. specific humidity
C. effective humidity
D. relative humidity
[单项选择]After the order “（）” is given, the air system is shut down, the turning gear put in.
A. Finished with Engine
B. Stop the Engine
C. Stand-by Engine
D. Slow-down Engine
[单项选择]Air temperature varies with（）.
A. the altitude above sea level
B. the season of the year
C. the latitude or distance from the equator
D. All of the above
[单项选择]After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.
A. steering
B. timing
C. turning
D. running
[单项选择]A warm air mass is characterized by（）.
A. stability
B. instability
C. gusty winds
D. good visibility
[单项选择]An air mass is termed warm if（）.
A. it is above 70°F
B. the ground over which it moves is cooler than the air
C. it originated in a high pressure area
D. it originated in a low pressure area
[单项选择]When compared to air temperature,which factor is most useful in predicting fog?（）
A. Vapor pressure
B. Dew point
C. Barometric pressure
D. Absolute humidity
[单项选择]While on watch，you notice that the air temperature is dropping and is approaching the dew point.Which type of weather should be forecasted（）.
A. Hail
B. Heavy rain
C. Sleet
D. Fog
[单项选择]For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）
A. Chilled water system supply temperature
B. Chilled water system return temperature
C. Compressor discharge temperature
D. Compressor suction pressure
[单项选择]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 only
B. cooling and humidifying
C. cooling and dehumidifying
D. adiabatic cooling
