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单选题
A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.
A
pump
B
engine
C
turbine
D
boiler
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单选题The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）A
re-evaporatorB
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单选题While flowing through the volute in a centrifugal pump, part of the （） energy of the liquid is converted to （） energy.A
kinetic；pressureB
kinetic；essentialC
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单选题Which of the following statements about pump operations is NOT a correct statement?（）A
In order for a fluid to be pumped, a fluid must be made to flowB
A substance must be cold in order for it to be pumpedC
The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic systemD
A pump must receive its energy from an external source
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单选题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 whichB
from which/at whichC
to which/from whichD
in which/on which
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单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
They are started with the discharge valve openedC
The flow of liquid is developed by imparting energy due to the rotation of an impellerD
They are always mounted in a horizontal position
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单选题A pump is defined as device that（）A
produces pressureB
imparts energy to a fluid to move it from level ‘A’ to level ‘B’C
creates a vacuum to move a liquid in all installationD
is to develop a pressure differential
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单选题The flash point of a liquid refers to the temperature （）A
at which a liquid will give off inflammable vaporsB
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at which a liquid will explodeD
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单选题The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.A
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impellerD
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单选题Which of the following terms could be applied to the simple definition the energy of motion?（）A
Electrical energyB
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单选题The basic function of the centrifugal pump impeller is to （）.A
directly increase the pressure of the liquid being pumpedB
directly increase the velocity of the liquid being pumpedC
convert the potential energy of the liquid to kinetic energyD
separate air from the liquid being pumped
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单选题According to the Chemical Data Guide，1，3 - pentadiene possesses which characteristic? （）A
Colorless liquid，mild aromatic odorB
Pale yellow liquid，strong odorC
Colorless liquid，faint odorD
Straw-colored liquid，sweet-odor
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单选题Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）A
Height of the machineB
Temperature of the liquid sealC
Gravity discD
Bowl diameter
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单选题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 vaporB
The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityC
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureD
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单选题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
RefrigeratorB
RefrigerantC
Cooling mediumD
Brine
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单选题Which of the following forms of energy is demonstrated through the process of combustion?（）A
Chemical energyB
Mechanical energyC
Thermal energyD
Electrical energy
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多选题Which two statements are true about TCP communication?（）AThe receiver acknowledges the final packet in each communications stream.BThe receiver adds sequencing numbers to the packets received.CThe sender adds sequencing numbers to the packets it sends.DThe receiver acknowledges each packet it receives from the sending device.
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单选题Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）A
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Eye
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