Reid vapor pressure is（）.

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  A . raised B . risen C . reduced D . maintained constant

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  A . Ball float B . Thermostatic C . Bimetallic D . Impulse

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  A . dew point temperature B . condensation temperature C . psychometric temperature D . absolute humidity temperature

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  A . below B . above C . equal to D . much larger tha

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  A . saturated B . super-cooled C . wet D . superheated

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  A . Static electricity B . An open running electric motor C . Loose wiring D . Explosion proof light

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• The latent heat of water vapor in air is dependent upon the （）

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• Which statement is TRUE concerning fuel vapors on a vessel（）.

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• The weight of liquefied petroleum gas vapors as compared to air is（）.

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  A . increased capacity of the compressor B . more efficient operation of the thermal expansion valve C . decreased capacity of the compressor D . loss of receiver capacity

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• A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

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  A . ignition temperature B . flash point C . flammable range D . convection index

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• The vapor pressure of a substance（）.

  A . decreases as temperature increases B . increases with the temperature C . is not affected by temperature D . may increase or decrease as the temperature rise

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• The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.

  A . soluble state B . solid state C . liquefied state D . inert state

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• What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）

  A . Refrigerator B . Refrigerant C . Cooling medium D . Brine

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• The explosive range of a mixture of flammable vapors is specified as a percentage of （）.

  A . flammable vapor by volume in air B . oxygen present to support combustion C . the temperature of the flash point D . the lower limit of explosibility of the mixture

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• When the relief valve opens it discharges high pressure refrigerant vapor to the （）.

  A . liquid strainer B . refrigerant inlet of the condenser C . inlet side of the evaporator D . suction side of the compressor

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• 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 ga

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• In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.

  A . evaporator B . compressor C . condenser D . none of the above

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• 原文:Gasoline is a fuel whose vapor is readily explosive..译文:汽油是一种燃料,其油气 。

  A、很容易蒸发 B、 很容易爆炸

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• What is LEAST likely to cause ignition of fuel vapors ________．

  A.Static electricity B.An open running electric motor C.Loose wiring D.Explosion proof lights

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• The values of the vapor pressure lowering,boiling point elevation, freezing point depression of nonelectrolyte depend on（）

  A．the volume of the solution B．the nature of the solute C．the molality of the solute in the solution D．the temperature of the solution

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• Which of the following would lead to an increase in the vapor pressure of a liquid I. Increasing the temperature II. Adding a nonvolatile

  A．I only B．II only C．Both I and II D．Neither I nor II

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