When the refrigeration demand is small,_______.A.the expansion valve will move toward the wide open positionB.the expansion valve will move toward the closing positionC.the feeler bulb will conveys the high temperatureD.the superheat degree will raise

题目

When the refrigeration demand is small,_______.

A.the expansion valve will move toward the wide open position

B.the expansion valve will move toward the closing position

C.the feeler bulb will conveys the high temperature

D.the superheat degree will raise

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.Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?A.The tank must be gas freedB.The tank must be ballastedC.The tank must be vented to the atmosphereD.The bypass valve must also be closed

3.Hurricanes may move in any direction．However，it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the ______．A.West or northwestB.NortheastC.SoutheastD.North

4.The expansion valve used in a refrigeration system regulates theA.superheat of the gas leaving the compressorB.back pressure in the evaporatorC.temperature in the refrigerated spaceD.degree of superheat of the gas leaving the evaporator

更多“When the refrigeration demand is small,_______.A.the expansion valve will move toward the ”相关问题

  • 第1题：

    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


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    In a compression refrigeration plant the refrigerant flows from the expansion valve and through the （） where it absorbs heat from the space being cooled and becomes a gas or vapor.
    A

    compressor

    B

    condenser

    C

    throttle valve

    D

    evaporator


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    What is the function of thermostatic expansion valve in a compression refrigeration system?（）
    A

    nonexistent

    B

    for controlling pressure

    C

    for controlling superheat

    D

    for controlling the solenoid valve


    正确答案： B
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）
    A

    The liquid receiver functions to collect and remove non-condensable gases

    B

    A thermostatic expansion valve is used to control refrigerated space temperature

    C

    Refrigerant temperature in an evaporator is directly related to refrigerant pressure

    D

    Dehydrators must be used continuously in a refrigeration system


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    Moisture in a refrigeration system can cause （）.
    A

    freezing the expansion valve closed

    B

    corrosion of system piping

    C

    improper temperature regulation

    D

    all of the above


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    A solenoid valve used in a refrigeration system should be installed （）.
    A

    with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve

    B

    upright, sensing temperature of the box, and upstream of the thermal expansion valve

    C

    upright, sensing temperature of the box, and downstream of the thermal expansion valve

    D

    upright, sensing heat of the tail coil, and upstream of the thermal expansion valve


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    When the refrigeration demand is small,（）
    A

    the expansion valve will move toward the wide open position

    B

    the expansion valve will move toward the closing position

    C

    the feeler bulb will conveys the high temperature

    D

    the superheat degree will raise


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）
    A

    solenoid valve

    B

    low pressure cutout switch

    C

    king valve

    D

    thermal expansion valve


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to （）.
    A

    re-adjust the discharge pressure

    B

    clean the expansion valve screen

    C

    add refrigerant

    D

    adjust the expansion valve


    正确答案： A
    解析： 暂无解析

  • 第10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

  • 第11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

  • 第12题：

    单选题
    Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
    A

    Thermal expansion valve frozen open

    B

    Suction gas heat exchanger bypassed

    C

    Condenser clogged or fouled

    D

    High pressure cutout switch inoperative


    正确答案： A
    解析： 暂无解析

  • 第13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14题：

    单选题
    The scale trap is located between the （）
    A

    king valve and the expansion valve

    B

    solenoid valve and expansion valve

    C

    evaporator and receiver

    D

    compressor and evaporator


    正确答案： B
    解析： 暂无解析

  • 第15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16题：

    单选题
    What separate the high pressure side from the low pressure side in a refrigeration system?（）
    A

    Condenser and thermal expansion valve

    B

    King and solenoid valves

    C

    Compressor and thermal expansion valve

    D

    Condenser and solenoid valve


    正确答案： C
    解析： 暂无解析

  • 第17题：

    单选题
    When the heat load begins to increase, the needle valve of an expansion valve will（）
    A

    move in an opening direction

    B

    move in a closing direction

    C

    either open or close

    D

    not move at all


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    Which of the listed statements is correct concerning refrigeration systems?（）
    A

    Dehydrators must be used continuously in a refrigeration system

    B

    A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours

    C

    A thermostatic expansion valve is used to control refrigerated space temperature

    D

    The liquid receiver functions to collect and remove non- condensable gases


    正确答案： A
    解析： 暂无解析

  • 第19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： 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
    The low pressure side of a refrigeration system is considered to exist from the （）.
    A

    expansion valve to the compressor

    B

    receiver to the expansion coil

    C

    expansion valve to the evaporator

    D

    condenser to the expansion valve


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    A pressure drop in the liquid line of a refrigeration system may cause（）
    A

    the solenoid valve to seize

    B

    the compressor to hunt

    C

    flash gas to form in the liquid line

    D

    the expansion valve to freeze open


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    Hurricanes may move in any direction．However，it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the（）.
    A

    West or northwest

    B

    Northeast

    C

    Southeast

    D

    North


    正确答案： A
    解析： 暂无解析

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