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

题目

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

相似考题

1.Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )A.Shortage of refrigerant oilB.Slight shortage of refrigerantC.Excessive condenser cooling water flowD.Faulty expansion valve

2.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

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.If a refrigeration compressor is short cycling on high head pressure, you shouldA.purge the condenser if the waterside is dirtyB.check for proper water flow through the condenserC.increase the high pressure cutout settingD.reduce the cooling water flow

参考答案和解析
正确答案：B
更多“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”相关问题

  • 第1题：

    Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?

    A.A shortage of liquid refrigerant.

    B.Excessive frost on the evaporator.

    C.Excessive condenser cooling water.

    D.Insufficient condenser cooling water flow.


    正确答案：D

  • 第2题：

    单选题
    The presence of air in the condenser of a refrigeration system will （） the condensing pressure.
    A

    increase

    B

    reduce

    C

    maintain constant

    D

    None of the above is true


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）
    A

    Shortage of refrigerant oil

    B

    Slight shortage of refrigerant

    C

    Excessive condenser cooling water flow

    D

    Faulty expansion valve


    正确答案： B
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）
    A

    Latent heat of vaporization

    B

    Heat of compression

    C

    Superheat

    D

    All of the above


    正确答案： B
    解析： 暂无解析

  • 第5题：

    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


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    If a refrigeration compressor is short cycling on high head pressure, you should （）.
    A

    purge the condenser if the waterside is dirty

    B

    check for proper water flow through the condenser

    C

    increase the high pressure cutout setting

    D

    reduce the cooling water flow


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    One cause of high head pressure occurring in a refrigeration system can be （）.
    A

    insufficient cooling water flow to the condenser

    B

    a low refrigerant charge in the system

    C

    the liquid valve is open too much

    D

    high evaporator superheat


    正确答案： A
    解析： 暂无解析

  • 第8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

  • 第9题：

    单选题
    Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
    A

    A shortage of liquid refrigerant

    B

    Excessive frost on the evaporator

    C

    Excessive condenser cooling water

    D

    Insufficient condenser cooling water flow


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
    A

    increase the amount of cooling water to the condenser

    B

    decrease the amount of cooling water to the condenser

    C

    add more refrigerant to the system

    D

    remove some refrigerant from the system


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.
    A

    maintain adequate coil back pressure

    B

    prohibit flashing in the liquid line

    C

    reduce refrigerant volume in the system

    D

    reduce compressor discharge line loading


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be （）.
    A

    excessive condenser cooling water

    B

    warm food in the refrigerator

    C

    a shortage of refrigerant

    D

    s shortage of compressor oil


    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
    If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.
    A

    a shortage of compressor oil

    B

    warm food in the refrigerator

    C

    excessive condenser cooling water

    D

    a shortage of refrigerant


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
    A

    restriction in refrigerant piping

    B

    air and non-condensable gases in the condenser

    C

    water in the refrigerant

    D

    flooding back of liquid refrigerant from the evaporator


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.
    A

    compressor；condenser

    B

    condenser；evaporator

    C

    throttle valve；evaporator

    D

    evaporator；condenser


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    When adding oil to a refrigeration system, precautions must be taken to ensure that （）.
    A

    the compressor suction pressure is not too high

    B

    all air is purged from the pump and charging fittings

    C

    the high pressure cutout switch is held open to prevent accidental starting

    D

    the condenser is completely shutdown first


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.
    A

    change the expansion valve adjustment

    B

    readjust the water regulating valve to increase the flow of water

    C

    purge air from the condenser

    D

    clean the waterside of the condenser


    正确答案： C
    解析： 暂无解析

  • 第19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20题：

    单选题
    In a refrigeration system, if the cooling water to the condenser fails, the（）.
    A

    box temperature solenoid valve will close

    B

    expansion valve will close

    C

    compressor will shutdown

    D

    king valve will open


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Which will cause the high pressure cutout to stop the compressor in a R-22 system?（）
    A

    Condenser leakage

    B

    A shortage of liquid refrigerant

    C

    Excessive frost on the evaporator

    D

    Not enough condenser cooling water


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    In the refrigeration system, a shortage of refrigerant is indicated by （）.
    A

    the compressor short cycling on high pressure cut out switch

    B

    high suction pressure

    C

    high head pressure

    D

    bubbles in the sight glass


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）
    A

    The condenser and the expansion valve

    B

    The king valve and the solenoid valve

    C

    The compressor and the expansion valve

    D

    The condenser and the solenoid valve


    正确答案： B
    解析： 暂无解析

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