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

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

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

  A . total head B . discharge head C . net positive suction head D . suction head

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• Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?（）

  A . Dry chemical B . Foam C . Water D . Carbon dioxide

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  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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• 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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• When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.

  A . flooding back B . superheating C . overflowing D . recycling

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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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• Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）

  A . Proper refrigerant charge B . Faulty expansion valve C . Insufficient refrigerant D . Solenoid valve stuck ope

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• In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.

  A . evaporator B . compressor C . expansion valve D . condenser

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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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• Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

  A . boiler B . heater C . engine D . cooler

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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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• The______is used to measure the volume of a liquid or gas through a pipeline within any given period of time

  A.flow-meter B.viscometer C.micrometer D.feeler

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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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• A long time horizon and low liquidity requirements best describe the investment needs of a（n）:

  A、endowment. B、Insurance company. C、bank.

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• The effects of a decrease in interest rate （yield） volatility o n the market yield of a debt security with a prepayment option and on a debt security with a put option are most likely a （n）:

  Prepa A、Increase Decrease B、Decrease Increase C、Decrease Decrease

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• If interest rate volatility increases, which of the following bonds will experience a price decrease？

  A．A callable bond. B．A putable bond. C．A zero-coupon,option-free bond.

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