单选题If the high-pressure switch on the compressor opens and stops the compressor a possible cause could be:()Atoo much cooling water going through the condenserBnot enough refrigerant in the systemCa leak in the evaporator coilsDno enough cooling water going through the condenser

单选题
If the high-pressure switch on the compressor opens and stops the compressor a possible cause could be:()
A

too much cooling water going through the condenser

B

not enough refrigerant in the system

C

a leak in the evaporator coils

D

no enough cooling water going through the condenser


参考解析

解析: 暂无解析

相关考题:

In face of the current stock market, most stock-holders_____.[A] stop injecting more money into the stock market[B] react angrily to the devaluing stock[C] switch their money around in the market[D] turn a deaf ear to the warning

First you should switch the machine ____ before you stop your work. a. onb. offc. up

When adding oil to a refrigeration system, precautions must be taken to ensure thatA.the compressor suction pressure is not too highB.all air is purged from the pump and charging fittingsC.the high pressure cutout switch is held open to prevent accidental startingD.the condenser is completely shutdown first

If a refrigeration system were short of refrigerant, the condition would result inA.continuous running of the compressorB.high suction pressureC.high discharge pressureD.short cycling of the compressor on the water failure switch

if it is cold ,you will find the air conditioner compressor stop automatically ,do you know the reasons ?

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

控制时间限设定值菜单()功能是当在一定时间内压缩机的启动次数达到该设定值时,压缩机将在一个小时内无法启动。A、STOP LAG COMPRESSOR TIMERB、FORCE START LAG COMPRESSOR TIMERC、HOT STARTS/HR COUNTERD、START LAG COMPRESSOR TIMER

单选题Which will cause the high pressure cutout to stop the compressor in a R-22 system?()ACondenser leakageBA shortage of liquid refrigerantCExcessive frost on the evaporatorDNot enough condenser cooling water

单选题The device used for low-pressure control and high-pressure cutout on a compressor is called a()AcutoutBpressure controllerCcontroller switchDcutout switch

单选题The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as ().AinjectionBpenetrationCatomizationDcompression

单选题The unloading system on an air compressor will ().Aincrease compressor discharge pressure on demandBincrease compressor operating speed as necessaryCallow the motor to turn the compressor opposed only by frictionDreduce the compressor frictional load when starting

单选题When adding oil to a refrigeration system, precautions must be taken to ensure that ().Athe compressor suction pressure is not too highBall air is purged from the pump and charging fittingsCthe high pressure cutout switch is held open to prevent accidental startingDthe condenser is completely shutdown first

单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the ().Asystem was overcharged with refrigerantBhigh pressure switch was improperly adjustedCexpansion valve strainers were fouledDsuction valves were leaking slightly

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When the relief valve opens it discharges high pressure refrigerant vapor to the ().Aliquid strainerBrefrigerant inlet of the condenserCinlet side of the evaporatorDsuction side of the compressor

单选题If the compressor runs continually, the cause might be the()Ahigh-pressure cutout switch is jammed openBlow-pressure switch is jammed shutCthermal bulb is not operating properlyDscale trap is clogged

单选题Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()AA shortage of liquid refrigerantBExcessive frost on the evaporatorCExcessive condenser cooling waterDInsufficient condenser cooling water flow

单选题If the discharge valves on a refrigeration compressor are leaking badly, the compressor should ().Arun continuouslyBnot startChave high discharge pressureDshort cycle on the high pressure switch

单选题The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch, One reason for this could be the ().Asystem is low on refrigerantBhigh pressure cutout switch is improperly adjustedCdischarge valves are leaking slightlyDdischarge valves are leaking excessively

单选题If the head pressure of a reciprocating refrigeration compressor is excessive, ().Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve

单选题If the head pressure is too high,()Athe relief valve should open before the high-pressure cutoutBthe relief valve should open and let excess refrigerant go to receiverCthe high-pressure cutout switch should operate before the relief valve opensDclose in on the suction valve

单选题The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch()Asystem is overcharged with refrigerantBsystem is low on refrigerantCdischarge valves are leaking excessivelyDdischarge valves are leaking slightly

单选题The purpose of the refrigeration system low pressure cutout switch is to ()Aprotect the compressor from liquid flood backBprotect the compressor from low discharge pressureCstart and stop the compressor upon system demandDstart the compressor after a drop in the evaporator pressure

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If a compressor runs continuously, the cause might be a()Adefective thermal bulbBclogged scale trapCstuck high-pressure switchDstuck low-pressure switch

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Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()AThermal expansion valve frozen openBSuction gas heat exchanger bypassedCCondenser clogged or fouledDHigh pressure cutout switch inoperative