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单选题
The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.
A
passing it through the expansion valve
B
condensing refrigerant in the system condenser
C
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor
D
maintaining a high pressure on the systems receiver
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更多 “单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A passing it through the expansion valveB condensing refrigerant in the system condenserC passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD maintaining a high pressure on the systems receiver” 相关考题
考题
The heat identified by only a change in temperature is known asA.sensible heatB.latent heatC.total heatD.residual heat
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According to the passage, which of the following statement is not true?A.the heat exchanging surfaces should be kept substantially cleanB.the heat exchanger flow passages should be clear of obstructionC.seals for the plate heat exchanger needs to be renewed oftenD.the cleaning process of the plate heat exchanger should be done following our experiences only
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Which of the following is the MOST critical component related to removing heat from the CPU?()
A. Vented caseB. Number of fansC. Thermal pasteD. Liquid cooling
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Ink-jet printer belongs to nonimpact printers in which the characters are formed by projecting particles or droplets of ink on to paper.(71) printer is also a nonimpact printer in which the characters are produced by applying hot elements to heat-sensitive paper directly or by melting ink from a(72) on to plain paper. Electrostatic printer creates an electrostatic latent image, which is then made visible by a toner and transferred and fixed on paper. An electrostatic printer may be used in some instances as a(73). Laser printer creates, by means of a laser beam directed on a(74) surface, a latent image which is then made visible by a toner and transferred and fixed on paper. Magnetographic printer creates, by means of magnetic heads operating on a metallic drum, a latent image which is then made visible by a toner and transferred and fixed on paper. Computer-output-microfilm (COM) printer produces on a photographic film a(75) of each page.A．HotB．WarmC．HeatD．Thermal
考题
The heat gained per pound of refrigerant in the evaporator is known as the ______.A.latent heat of vaporizationB.sensible heatC.refrigerating effectD.specific heat of vaporization
考题
The sum of the sensible heat and the latent heat of any substance is known as ______.A.total heatB.residual heatC.specific heatD.superheat
考题
When collecting condensation for drinking water，______．A.A sponge used to mop up and store condensation must be kept salt freeB.Only condensation on the bottom of the canopy should be collectedC.It should be strained through a finely woven clothD.Chlorine tablets should be used to make it drinkable
考题
Fire may be spread by which means?A.Conduction of heat to adjacent surfacesB.Direct radiationC.ConvectionD.All of the above
考题
Which of the following is the MOST critical component related to removing heat from the CPU?（）A、Vented caseB、Number of fansC、Thermal pasteD、Liquid cooling
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Which of the following statements about cooling is true？（）A、Adapter cards （e.g. modems） do not add to the heat generated in a computer case.B、Bus mastering reduces the amount of heat generated inside a computer case.C、Removing expansion slot covers can compromise cooling airflow design.D、Periodic cleaning of the computer components inside the case has no effect on cooling efficiency.
考题
单选题The latent heat of evaporation is dissipated in the （） in a compression refrigeration system.A
evaporatorB
condenserC
expansion valveD
compressor
考题
单选题The air supplied to a diesel engine is compressed to （） (1) provide heat for the ignition of the fuel (2) decrease injection delayA
(1) only is correctB
(2) only is correctC
both (1) and (2) are correctD
neither (1) or (2) are correct
考题
单选题What is the purpose of sub cooling R-12 in the condenser?（）A
to increase the system efficiency by sensible heat transferB
to stop the liquid from flashingC
to reduce the load on the compressorD
to remove latent heat of vaporization and the suction piping transfer
考题
单选题The sum of the sensible heat and the latent heat of any substance is known as （）.A
total heatB
residual heatC
specific heatD
superheat
考题
单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.A
compressorB
condenserC
receiverD
evaporator
考题
单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.A
bypass exhaust gas at high loads to prevent excessive back pressureB
bypass a portion of the exhaust gas at peak loads for better efficiencyC
recycle exhaust gas to the turbochargerD
minimize moisture condensation in the boiler gas passages at low loads
考题
单选题Fire may be spread by which means?（）A
Conduction of heat to adjacent surfacesB
Direct radiationC
ConvectionD
All of the above
考题
单选题Which of the following statements is correct concerning heat transfer?（）A
Heat is given off from a high temperature region known as a heat sinkB
Heat transfer rate is affected most by the size of the heat sink involvedC
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sinkD
Heat transfer by radiation will occur only by mass motion of a fluid substance
考题
单选题A fire may be spread by which of the following means?（）A
Conduction of heat to adjacent surfacesB
Direct radiationC
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All of the above
考题
单选题Latent heat changes the （） of water.A
physical stateB
temperatureC
atmospheric pressureD
sensible pressure
考题
单选题A condenser is a vessel in which（） is deprived of its latent heat of vaporization and so changed to its liquid state.A
sea waterB
fresh waterC
vapourD
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考题
单选题Which of the following is true of the heating system of the Johnstown campus?A
The heat is supplied by human bodies only.B
The heat is supplied by both human bodies and other heat-emitting objects.C
The heat is supplied by both human bodies and conventional fuel.D
The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
考题
单选题The heat identified by only a change in temperature is known as （）.A
sensible heatB
latent heatC
total heatD
residual heat
考题
单选题The amount of heat released by steam when it changes to water at the same temperature is called（）.A
latent heat of condensationB
latent heat of vaporizationC
latent heat of saturationD
sensible heat of condensation
考题
单选题The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.A
fusionB
vaporizationC
sublimationD
condensation
考题
单选题The latent heat of water vapor in air is dependent upon the （）A
dry bulb temperatureB
wet bulb temperatureC
dew pointD
dry point
考题
单选题The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.A
evaporation is accomplished in a vacuumB
due to the higher temperature of the incoming feedC
due to the latent heat of evaporation principleD
evaporation in a submerged medium produces more distillate
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