The pressure of a liquid leaving the pump can be referred to as the （）.

相似题目

• The （） pump discharges a nearly constant amount of liquid regardless of pressure.

  A . mixed-flow B . axial-flow C . centrifugal D . displacement

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• The volatility of a liquid is the tendency of a liquid to （）.

  A . ignite B . explode C . asphyxiate D . vaporize

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• For a L√Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will （）.

  A . be interrupted B . move downwards C . move outwards D . retain original positio

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• The pressure head of a pump is given in the unit of （）.

  A . kg B . MPa C . meter fluid column D . None of the above is true

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• Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.

  A . positive displacement B . non-positive displacement C . mixed-flow D . axial-flow

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• Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）

  A . The condenser and the expansion valve B . The king valve and the solenoid valve C . The compressor and the expansion valve D . The condenser and the solenoid valve

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• Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）

  A . Impeller B . Electric motor C . Volute D . Eye

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• Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

  A、Height of the machine B、Temperature of the liquid seal C、Gravity disc D、Bowl diameter

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• The presence of bubbles in a refrigeration system liquid line may （）.

  A . promote refrigerant dehydration B . be absorbed in the receiver C . cause low condensing pressure D . carry moisture and lead to corrosio

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• Which of the following terms is used to identify the pressure of the liquid entering a pump?（）

  A . Suction head B . Pump head C . Discharge head D . Total head

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• The tendency of a flammable liquid to vaporize is indicated by its （）.

  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 temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.

  A . at which/to which B . from which/at which C . to which/from which D . in which/on which

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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 （） discharge a nearly constant amount of liquid regardless of pressure.

  A . mixed-flow pump B . axial-flow pump C . centrifugal pump D . displacement pum

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• Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.

  A . freezing point B . floc point C . condensing temperature D . compression temperature

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• The flash point of a liquid refers to the temperature （）

  A . at which a liquid will give off inflammable vapors B . at which a liquid will burn steadily C . at which a liquid will explode D . that a liquid must reach before it will flow readily

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• Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

  A . positive displacement B . ejector C . centrifugal D . air compressor

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• Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）

  A . At the designed operating temperature, the liquid refrigerant charge has changed to a vapor B . The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity C . The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature D . The sensing bulb is never emptied of liquid refrigerant under normal operating conditio

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• A pressure drop in the liquid line of a refrigeration system may cause（）

  A . the solenoid valve to seize B . the compressor to hunt C . flash gas to form in the liquid line D . the expansion valve to freeze ope

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• Which of the following statements is correct concerning the “flash point ” of a liquid?（）

  A . It is lower than the ignition temperature B . It is the temperature at which a substance will spontaneously ignite C . It is the temperature at which a substance, when ignited, will continue to bum D . It is the temperature at which the released vapors will fall within the explosive range

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• For a L.Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will _____.

  A.be interrupted B.move downwards C.move outwards D.retain original position

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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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