更多"The heat required to change a subst"的相关试题:
[单项选择]The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.
A. fusion
B. vaporization
C. sublimation
D. condensation
[单项选择]When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）
A. CO2
B. Methyl chloride
C. R-22
D. Sulphur dioxide
[单项选择]Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.
A. air cooler
B. economizer
C. injector
D. air blower
[单项选择]The heat identified by only a change in temperature is known as （）.
A. sensible heat
B. latent heat
C. total heat
D. residual heat
[单项选择]The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）
A. latent heat of expansion
B. sensible heat of condensation
C. heat of compression
D. all of the above
[单项选择]The heat used to change a liquid to a vapor is called （）.
A. latent heat of fusion
B. latent heat of vaporization
C. specific heat of vaporization
D. latent heat of the gas
[单项选择]The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A. size of the heat sink
B. temperature difference between the regions
C. size of the heat source
D. total heat of the system
[单项选择]If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, （）.
A. compressor lubrication will be improved
B. oil will not leave the crankcase
C. compressor valves will be damaged
D. oil may congeal in the evaporator
[单项选择]A patient suffering from heat exhaustion should be（）.
A. moved to a cool room and told to lie down
B. kept standing and encouraged to walk slowly and continuously
C. given a glass of water and told to return to work after 15 minutes of rest
D. None of the above are correct
[单项选择]（）does it take to change the main engine from ahead to astern?
A. How many times
B. How much water
C. How long
D. How length
[单项选择]Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.
A. lower；higher
B. shallower；deeper
C. larger；smaller
D. higher；lower
[单项选择]The （） can tell us how much heat we can get from the burning of an oil.
A. viscosity
B. flash point
C. cetane number
D. calorific value
[单项选择]The sum of the sensible heat and the latent heat of any substance is known as （）.
A. total heat
B. residual heat
C. specific heat
D. superheat
[单项选择]Scale accumulation on evaporator heat exchange surfaces （）.
A. increases brine density
B. increases distillate salinity
C. reduces metal corrosion
D. reduces heat transfer
[单项选择]Symptoms of heat stroke are（）.
A. cold and moist skin，high body temperature
B. cold and dry skin，low body temperature
C. hot and moist skin，high body temperature
D. hot and dry skin，high body temperature
[单项选择]Which of the statements listed concerning heat transfer is correct?（）
A. Heat is always transferred at a constant rate
B. Heat transfer rate increases as temperature difference increases
C. The rate of heat transfer is not affected by temperature difference
D. The high temperature region is known as a heat sink
[单项选择]Generating tubes in waste heat boilers are finned to （）.
A. reduce gas flow turbulence
B. prevent exhaust gas corrosion
C. increase the rate of combustion
D. increase the rate of heat transfer
[单项选择]The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of（）
A. aluminum plates
B. lead cathodes
C. copper baffle plates
D. sacrificial zincs
[单项选择]Diesel engine waste heat boiler construction is usually of the fire-tube or（）
A. cyclone furnace boiler type
B. dry back boiler type
C. water-tube type
D. critical circulation boiler type
