单选题If a refrigeration system compressor crankcase is sweating, you should （）.A add refrigerant to the systemB adjust the thermal expansion valve to the proper settingC adjust the float valve to the proper holding pressureD open the hand expansion valve

题目
单选题
If a refrigeration system compressor crankcase is sweating, you should （）.
A

add refrigerant to the system

B

adjust the thermal expansion valve to the proper setting

C

adjust the float valve to the proper holding pressure

D

open the hand expansion valve

相似考题

1.If the refrigeration compressor crankcase is sweating, the cause may be due toA.a shortage of refrigerantB.the compressor running continuouslyC.liquid refrigerant returning to the compressorD.the compressor short cycling on the high pressure cutout

2.Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system

3.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

4.Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur when the compressorA.has run continuously for a long periodB.suction pressure is below normalC.oil level is below normalD.starts after a long idle period

参考答案和解析
正确答案： A
解析： 暂无解析
更多“If a refrigeration system compressor crankcase is sweating,”相关问题

  • 第1题：

    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 receiver

    C.on the suction side of the compressor

    D.on the discharge side of the compressor


    正确答案：C

  • 第2题：

    单选题
    The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.
    A

    sudden evaporation of wax crystals in the lubricant

    B

    sudden evaporation of entrapped air in the lubricant

    C

    release of refrigerant from the oil/refrigerant mixture

    D

    release of dissolved lubricant from the refrigerant


    正确答案： B
    解析： 暂无解析

  • 第3题：

    单选题
    When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.
    A

    flooding back

    B

    superheating

    C

    overflowing

    D

    recycling


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.
    A

    system was overcharged with refrigerant

    B

    system was low on refrigerant

    C

    suction valves were leaking slightly

    D

    relief valve was leaking slightly


    正确答案： D
    解析： 暂无解析

  • 第5题：

    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 （）.
    A

    system is low on refrigerant

    B

    high pressure cutout switch is improperly adjusted

    C

    discharge valves are leaking slightly

    D

    discharge valves are leaking excessively


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    If the refrigeration compressor crankcase is sweating, the cause may be due to （）.
    A

    a shortage of refrigerant

    B

    the compressor running continuously

    C

    liquid refrigerant returning to the compressor

    D

    the compressor short cycling on the high pressure cutout


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.
    A

    compressor damage from improper lubrication

    B

    refrigerant absorption by the lubricant

    C

    increased viscosity in the lubricant

    D

    carbon deposit on the compressor suction valves


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.
    A

    open-type

    B

    hermetic

    C

    semi-hermetic

    D

    all the above


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The purpose of the refrigeration system low pressure cutout switch is to （）
    A

    protect the compressor from liquid flood back

    B

    protect the compressor from low discharge pressure

    C

    start and stop the compressor upon system demand

    D

    start the compressor after a drop in the evaporator pressure


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    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


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    The sensing line for the low pressure cutout switch to a refrigeration system is located （）.
    A

    in the chill box

    B

    before the receiver

    C

    on the suction side of the compressor

    D

    on the discharge side of the compressor


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur（） when the compressor.
    A

    has continuously for a long period

    B

    suction pressure is below normal

    C

    oil level is below normal

    D

    starts after a long idle period


    正确答案： C
    解析： 暂无解析

  • 第13题：

    单选题
    Low compressor head pressure in a refrigeration system can be caused by（）.
    A

    insufficient condenser cooling water

    B

    excessive condenser cooling water

    C

    air in the refrigeration system

    D

    excessive refrigerant in the system


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
    A

    a shortage of refrigerant in the system

    B

    air in the system

    C

    an accumulation of liquid refrigerant in the crankcase

    D

    a shortage of oil in the crankcase


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.
    A

    overheated compressor bearings

    B

    excess lube oil viscosity

    C

    carbon deposits on the compressor piston rings

    D

    wax crystals forming in the lubricant


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    In a refrigeration system, foaming of the crankcase oil may cause the （）.
    A

    expansion valve to overfeed

    B

    compressor to knock

    C

    water regulating valve to fail

    D

    crankcase drains to plug


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.
    A

    always be wide open when the compressor restarts

    B

    continue to operate as if the system were in operation

    C

    remain open until evaporator pressure equalizes, then close until the compressor restarts

    D

    always be completely closed until the compressor restarts


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    Foaming of the oil in a refrigeration compressor crankcase is caused by （）.
    A

    refrigerant boiling out of solution from the lube oil

    B

    liquid refrigerant flooding the compressor and system

    C

    lube oil viscosity being reduced by refrigerant dilution

    D

    compressor suction pressure suddenly increasing


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
    A

    Sub-cooled liquid

    B

    Sub-cooled vapor

    C

    Superheated vapor

    D

    Liquid


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    Crankcase sweating in a refrigeration system is caused by （）.
    A

    a stuck solenoid valve

    B

    a shortage of refrigerant

    C

    too much oil in circulation

    D

    too much superheat


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    The accumulation of air and other non-condensable gases in a refrigeration system will （）.
    A

    cause a loss of the liquid seal

    B

    create a vapor lock in the liquid receiver

    C

    collect in the condenser

    D

    cause foaming of the oil in the crankcase


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.
    A

    liquid

    B

    dry saturated gas

    C

    wet saturated gas

    D

    superheated vapor


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    Sweating of the refrigeration system compressor crankcase is caused by （）.
    A

    too much superheat

    B

    insufficient superheat

    C

    suction pressure too low

    D

    excessive refrigerant returning to the compressor


    正确答案： D
    解析： 暂无解析

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