单选题A warmer than normal compressor suction line might be caused by （）.Ainsufficient lubricationBinsufficient refrigerantCexcess refrigerantDexcessive opening of the expansion valve
单选题
A warmer than normal compressor suction line might be caused by （）.
A
insufficient lubrication
B
insufficient refrigerant
C
excess refrigerant
D
excessive opening of the expansion valve
参考解析
解析：
暂无解析
相关考题：
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
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
Which of the problems listed could cause erosion of the expansion valve disks and seats?A.Overcharging the system with refrigerantB.Faulty compressor suction valveC.Failure of the high pressure cutoutD.Flash gas formed in the liquid line
单选题Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.Ausing a slightly dirty air filterBusing oil having an excessive viscosityCintercooler or after-cooler leaksDcarrying the oil level higher than normal
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（）Are-evaporatorBreceiverCdehydratorDsolenoid
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Which statement is TRUE about nylon line?（）AManila line will usually last longer than nylon lineBNylon line is excellent for use in alongside towingCA normal safe working load will stretch nylon line 50%DNylon stoppers should be used with nylon line
单选题Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result from a/an （）.Aoil suction line restrictionBcorrect amount of coolantCcavitation erosion in the water jacketsDclogged sea suction strainer
单选题Foaming of the oil in a refrigeration compressor crankcase is caused by （）.Arefrigerant boiling out of solution from the lube oilBliquid refrigerant flooding the compressor and systemClube oil viscosity being reduced by refrigerant dilutionDcompressor suction pressure suddenly increasing
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A dirty intercooler on the ship service air compressor will result in （）.Adecreased compression ratioBhigher than normal power consumptionCun-loader malfunctionDwater in the lubricating oil
单选题The static suction head of is the （）Adistance of the suction liquid level above the line of the pumpBdistance the suction liquid level is below the center line of the pumpCforce necessary to overcome frictional losses in the pump and pipingDamount in inches of mercury the total suction head is below atmospheric pressure
单选题Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.Aone size smaller than the pump suction nozzleBthe same size as the pump suction nozzleCone size larger than the pump suction nozzleDinstalled with a short radius elbow at the pump
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The compressor suction line conveys the refrigerant vapor from （） to （）.Acondenser；evaporatorBevaporator；compressorCcompressor；condenserDNone of the above
单选题Sweating of the refrigeration system compressor crankcase is caused by （）.Atoo much superheatBinsufficient superheatCsuction pressure too lowDexcessive refrigerant returning to the compressor
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）Aone valve seats upwards, while the other seats downwardsBthe reed valves used on the discharge are made substantially thicker and heavier than the suction valvesCthe suction valve springs exert a greater tension than the discharge valve springsDthe discharge valve springs exert a greater tension than the suction valve springs
单选题The purpose of the low pressure cut-out switch is to （）.Amaintain liquid refrigerant at the suction of the compressorBmaintain a preset suction pressure to the compressorCstart and stop the compressor at preset operating pressuresDoperate at minimum efficiency
单选题A bilge suction line，in a fishing vessel with more than 16 individuals aboard，must have a strainer with an open area not less than how many times the open area of the suction line?（）AoneBtwoCthreeDfour
单选题A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.Acondition of the expansion valveBmoisture in the systemCcondition of the compressor suction valvesDcondenser temperature