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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

题目

If the suction pressure for an operating refrigeration compressor is below normal, the cause may be ______.

A.an excess of liquid refrigerant

B.the expansion valve overfeeding

C.a fouled compressor suction strainer

D.the compressor short cycling

相似考题

1.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

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.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

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

更多“If the suction pressure for an operating refrigeration compressor is below normal, the cau ”相关问题

  • 第1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

  • 第2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：B

  • 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
    Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）
    A

    Closing of the solenoid valve

    B

    Closing of the expansion valve

    C

    An increase in the suction pressure

    D

    Decreasing the suction pressure


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.
    A

    passing it through the expansion valve

    B

    condensing refrigerant in the system condenser

    C

    passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor

    D

    maintaining a high pressure on the systems receiver


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
    A

    the relief valve should open before the high pressure cutout

    B

    the relief valve should open and allow the excess refrigerant to flow to the receiver

    C

    the high pressure cutout switch should operate before the relief valve opens

    D

    you should close in on the suction valve


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
    A

    refrigerant overcharge

    B

    overfeeding by the expansion valve

    C

    a restricted suction strainer

    D

    due to short cycling of the compressor


    正确答案： A
    解析： 暂无解析

  • 第8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9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10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11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12题：

    单选题
    Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
    A

    carbon deposits on the compressor suction valves

    B

    the evaporator temperature to increase

    C

    rapid corrosion of the thermal expansion valve

    D

    no operating problems


    正确答案： A
    解析： 暂无解析

  • 第13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14题：

    Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.

    A.carbon deposits on the compressor suction valves

    B.the evaporator temperature to increase

    C.rapid corrosion of the thermal expansion valve

    D.no operating problems


    正确答案：B

  • 第15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： A
    解析： 暂无解析

  • 第16题：

    单选题
    Insufficient refrigerant in a refrigeration plant may result in （）.
    A

    high discharge pressure

    B

    frosting of the crankcase

    C

    high temperature of the overboard water

    D

    low suction pressure of compressor


    正确答案： D
    解析： 暂无解析

  • 第17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： 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
    An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
    A

    oil foaming in the compressor

    B

    higher than normal suction and discharge pressures with a higher box temperature

    C

    higher than normal discharge pressure with a normal box temperature

    D

    the compressor to run continuously


    正确答案： C
    解析： 暂无解析

  • 第20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21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22题：

    单选题
    The purpose of the low pressure cut-out switch is to （）.
    A

    maintain liquid refrigerant at the suction of the compressor

    B

    maintain a preset suction pressure to the compressor

    C

    start and stop the compressor at preset operating pressures

    D

    operate at minimum efficiency


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a （）.
    A

    loose expansion valve control bulb

    B

    low differential setting on the H-Pcutout

    C

    blown fuse in the motor circuit

    D

    faulty suction pressure regulator


    正确答案： A
    解析： 暂无解析

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