An increase in the heat load to a refrigeration system will cause ______.A.the suction pressure to decreaseB.the suction temperature to increaseC.increased ice formation on the evaporator coilD.excessive short cycling of the compressor
An increase in the heat load to a refrigeration system will cause ______.
A.the suction pressure to decrease
B.the suction temperature to increase
C.increased ice formation on the evaporator coil
D.excessive short cycling of the compressor
相关考题：
In the refrigeration system, a shortage of refrigerant is indicated byA.the compressor short cycling on high pressure cut out switchB.high suction pressureC.high head pressureD.bubbles in the sight glass
If the suction pressure at the refrigeration compressor is below normal, the cause can beA.refrigerant overchargeB.overfeeding by the expansion valveC.a restricted suction strainerD.due to short cycling of the compress
Sweating of the refrigeration system compressor crankcase is caused by_______ .A.too much superheatB.insufficient superheatC.suction pressure too lowD.excessive refrigerant returning to the compressor
The sensing line for the low pressure cutout switch to a refrigeration system is located ______.A.in the chill box(冰箱)B.before the receiverC.on the suction side of the compressorD.on the discharge side of the compressor
If the suction pressure for an operating refrigeration compressor is below normal, the cause may be ______.A.an excess of liquid refrigerantB.the expansion valve overfeedingC.a fouled compressor suction strainerD.the compressor short cycling
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.A.carbon deposits on the compressor suction valvesB.the evaporator temperature to increaseC.rapid corrosion of the thermal expansion valveD.no operating problems
The refrigeration system low pressure cutout switch is actuated by______.A.an electric system managerB.a sensing bulb at the tail coil of the evaporatorC.pressure changes in the suction lineD.failure of the king solenoid valve
WHEN CONTACT MADE WITH THE RADIO STATION OAS AT SAN JUAN，A PRE-STOWAGE HATCH LIST WITH SEQUENCE OF LOADING TO BE SENT TO LOAD PORT NOT LESS THAN 48 HRS IN ADVANCE．From this fax，the pre-stowage hatch list shall be sent to ______．A.THE RADIO STATIONB.SAN JUANC.OASD.LOAD PORT
单选题The refrigeration system low pressure cutout switch is actuated by （）.Aan electric system managerBa sensing bulb at the tail coil of the evaporatorCpressure changes in the suction lineDfailure of the king solenoid valve
单选题The latent heat of evaporation is dissipated in the （） in a compression refrigeration system.AevaporatorBcondenserCexpansion valveDcompressor
单选题When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.Aflooding backBsuperheatingCoverflowingDrecycling
单选题What is the purpose of sub cooling R-12 in the condenser?（）Ato increase the system efficiency by sensible heat transferBto stop the liquid from flashingCto reduce the load on the compressorDto remove latent heat of vaporization and the suction piping transfer
单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.AcompressorBcondenserCreceiverDevaporator
单选题Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）AClosing of the solenoid valveBClosing of the expansion valveCAn increase in the suction pressureDDecreasing the suction pressure
单选题If a refrigeration system were short of refrigerant, the condition would result in （）.Acontinuous running of the compressorBhigh suction pressureChigh discharge pressureDshort cycling of the compressor on the water failure switch
单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）ALatent heat of vaporizationBHeat of compressionCSuperheatDAll of the above
单选题Moisture is removed from a refrigeration system by（）.Ableeding refrigerant from the condenserBopening a drain petcock on the oil separatorCcondensing the water in the heat exchangerDusing a dehydrator cartridge
单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.Apassing it through the expansion valveBcondensing refrigerant in the system condenserCpassing the gaseous refrigerant through the heat interchanger on the suction side of the compressorDmaintaining a high pressure on the systems receiver
单选题What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.ABends in the pipingBSlowing the pumping rateCPipeline valvesDBacking rings for pipe welds
单选题If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.Arefrigerant overchargeBoverfeeding by the expansion valveCa restricted suction strainerDdue to short cycling of the compressor
单选题An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.Aoil foaming in the compressorBhigher than normal suction and discharge pressures with a higher box temperatureChigher than normal discharge pressure with a normal box temperatureDthe compressor to run continuously
单选题Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.Acompressor damage from improper lubricationBrefrigerant absorption by the lubricantCincreased viscosity in the lubricantDcarbon deposit on the compressor suction valves
单选题Moisture in a refrigeration system can cause （）.Afreezing the expansion valve closedBcorrosion of system pipingCimproper temperature regulationDall of the above
单选题When the heat load begins to increase, the needle valve of an expansion valve will（）Amove in an opening directionBmove in a closing directionCeither open or closeDnot move at all
单选题An increase in the heat load to a refrigeration system will cause （）.Athe suction pressure to decreaseBthe suction temperature to increaseCincreased ice formation on the evaporator coilDexcessive short cycling of the compressor
单选题The sensing line for the low pressure cutout switch to a refrigeration system is located （）.Ain the chill boxBbefore the receiverCon the suction side of the compressorDon the discharge side of the compressor
单选题Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.Acarbon deposits on the compressor suction valvesBthe evaporator temperature to increaseCrapid corrosion of the thermal expansion valveDno operating problems