单选题When you adjust a thermostatic expansion valve, （）.A refrigerant must be bled off the sensing line before adjustments are madeB all refrigerant must be pumped into the receiver before adjustments are madeC time must be allowed for conditions to stabili

题目
单选题
When you adjust a thermostatic expansion valve, （）.
A

refrigerant must be bled off the sensing line before adjustments are made

B

all refrigerant must be pumped into the receiver before adjustments are made

C

time must be allowed for conditions to stabilize in the evaporator before further adjustments are made

D

all refrigerant must be routed through the dehydrator while changing the superheat setting

相似考题

1.When replacing a thermostatic expansion valve sensing bulb, it is necessary toA.apply a light film of oil to increase heat transferB.apply a light film of oil to prevent oxidationC.apply a heavy coating of grease to function as a heat sinkD.carefully coat the device with silicone sealant to reduce the effects of convective cooling

2.When you keep a gangway watch, you should （）the mooring lines according to the rise and fall of the tide.A、adjustedB、adjustingC、adjustsD、adjust

3.单选题During working, thermostatic expansion valve should be （）.A either all the way open or all the way closedB normally fully openC throttled depending on loadD controlled by liquefied pressure

4.A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA.evaporator pressure decreaseB.evaporator coil over-feedC.evaporator capacity increaseD.expansion valve diaphragm rupture

更多“When you adjust a thermostatic expansion valve, （）.”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
    If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）
    A

    a low level in the engine expansion tank

    B

    excessively high coolant pressure

    C

    improper temperatures

    D

    malfunctioning of the jacket water heater


    正确答案： B
    解析： 暂无解析

  • 第3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4题：

    单选题
    Thermostatic expansion valve are （）.
    A

    either all the way open or all the way closed

    B

    normally open

    C

    throttled depending on load

    D

    controlled by suction pressure


    正确答案： D
    解析： 暂无解析

  • 第5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6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7题：

    单选题
    A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.
    A

    return to a neutral position

    B

    flood the evaporator

    C

    open

    D

    close


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    The thermostatic valve has a throttling action, that is to say the valve can（）
    A

    stop the refrigerant from flowing

    B

    force the refrigerant to flow

    C

    cause the refrigerant pressure to rise

    D

    cause the refrigerant pressure to fall


    正确答案： A
    解析： 暂无解析

  • 第9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10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11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12题：

    单选题
    The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
    A

    regulating the level of corrosion inhibitor in the primary cooling system

    B

    the level of the freshwater expansion tank

    C

    varying the engine load to meet temperature requirements

    D

    the operation of the thermostatic valve


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.
    A

    around the engine

    B

    around the cooler

    C

    to the expansion tank

    D

    overboard


    正确答案： B
    解析： 暂无解析

  • 第14题：

    单选题
    A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.
    A

    open

    B

    close

    C

    remain in its position

    D

    flood the evaporator with refrigerant


    正确答案： B
    解析： 暂无解析

  • 第15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16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17题：

    单选题
    A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
    A

    evaporator pressure decrease

    B

    evaporator coil over-feed

    C

    evaporator capacity increase

    D

    expansion valve diaphragm rupture


    正确答案： C
    解析： 暂无解析

  • 第18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19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20题：

    单选题
    Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）
    A

    At the designed operating temperature, the liquid refrigerant charge has changed to a vapor

    B

    The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity

    C

    The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature

    D

    The sensing bulb is never emptied of liquid refrigerant under normal operating conditions


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Thermostatic expansion valves can be adjusted for （）.
    A

    suction pressure only

    B

    head pressure only

    C

    superheat only

    D

    suction pressure and box temperature


    正确答案： C
    解析： 暂无解析

  • 第22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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