The heated feedwater entering any flash chamber of a flash-type evaporator will（）
A . vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamber
B . vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber
C . vaporize, with the remaining water at the temperature greater than it entered the flash chamber
D . boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
相似题目
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The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
A . remain constant along the tubes length
B . be greatest in a single pass counter flow heat exchanger
C . remain constant throughout the heat exchanger
D . vary from section to section through out the heat exchanger
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Which of the listed effects represents the purpose of heat treating steel?（）
A . Develop ductility
B . Improve machining qualities
C . Relieves stresses
D . All of the above
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The heated feed-water entering any flash chamber of a flash-type evaporator will（）
A . vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamber
B . vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamber
C . vaporize, with the remaining water a t a temperature greater than it entered the flash chamber
D . boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
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In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.
A . compressor
B . condenser
C . receiver
D . evaporator
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The treatment of the fuel oils involves storage, heating, filtering and（）
A . centrifuging
B . pressurizing
C . atomization
D . igniting
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The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.
A . extracts
B . releases
C . gives no
D . absorbs no
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The latent heat of water vapor in air is dependent upon the （）
A . dry bulb temperature
B . wet bulb temperature
C . dew point
D . dry point
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The crew was unable to（）access to the engine room due to the extreme heat.
A . maintain
B . retain
C . gain
D . contai
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The sensible heat of air is dependent upon the （）.
A . dry bulb temperature
B . wet bulb temperature
C . saturation temperature
D . water vapor superheat
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（） the cylinder walls, the heat passes through them by conduction.
A . When receiving by
B . When received by
C . In order to receiving
D . In order to receive
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The design of for a flash type evaporator is of critical importance because it must provide an optimum feedwater spray pattern that facilitates the flashing process, and it must also maintain a pressure differential between successive stages（）
A . condenser
B . flashing device
C . lashing device
D . vacuum pum
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The rate of expansion of heated fuel oil varies with the （）.
A . conductivity
B . viscosity
C . volume
D . specific gravity
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The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.
A . fusion
B . vaporization
C . condensation
D . sublimatio
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Why did the man wait in the heat for two hours?
A . The coach had to be replaced．
B . The coach driver felt sick．
C . The hotel rooms were full．
D . The hotel had to be cleaned．
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Heat causes the（）of gas.
A . growth
B . increase
C . expansion
D . extensio
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Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.
A . not good
B . good
C . better
D . the best
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The Earth’s irregular heating is caused by （）.
A . the time of day
B . the seasons
C . geography
D . All of the above
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The energy released by the chemical reaction is ( ) heat.
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The trees can __________ part of the heat from the sun.
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The netizens tangled heatedly over the accusations of some foreign media against China.
A．combated
B．executed
C．argued
D．conceived
-
The earth ___the necessary amount of heat and light from the sun（）
A．supplies
B．receives
C．provides
D．requires
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In a diesel engine, offers the heat energy directly; works as working medium and changes the heat energy to mechanical energy.
A.the burning of the fuel; medium shaft
B.fuel spray; fresh air
C.fuel; fuel spray
D.the burning of the fuel; the burned gas mixture
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He opened the windows to____________ the heat.
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The sun heats the earth, which makes it possible for plants to grow.
