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

题目
单选题
During working, thermostatic expansion valve should be （）.
A

either all the way open or all the way closed

B

normally fully open

C

throttled depending on load

D

controlled by liquefied pressure

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.单选题During working of an air compressor, （） should be drained.A oil sumpB oil separatorC outlet pipeD inlet pipe

3.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

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“During working, thermostatic expansion valve should be （）.”相关问题

  • 第1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2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
    During operation, the （）should check the working condition of the derrick.
    A

    foreman

    B

    operator

    C

    opener

    D

    stevedore


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    During working of an air compressor, （） should be drained.
    A

    inter cooler

    B

    cylinder

    C

    outlet pipe

    D

    inlet pipe


    正确答案： A
    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
    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8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9题：

    单选题
    After passing through the expansion valve the refrigerant should be in the state of （）.
    A

    vapor

    B

    liquid

    C

    solid

    D

    None of the above is tree


    正确答案： A
    解析： 暂无解析

  • 第10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11题：

    单选题
    During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）
    A

    chief engineer

    B

    surveyor

    C

    the engineer

    D

    the technique personnel of the shipyard


    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
    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
    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16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 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19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20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21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22题：

    单选题
    Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
    A

    The expansion tank should be topped off

    B

    The thermostatic water regulating valves should be manually opened

    C

    The fuel filters should be changed

    D

    The engine should be turned over slowly with the indicator cocks open


    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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