Which of the problems listed could cause erosion of the expansion valve disks and seats?A.Overcharging the system with refrigerantB.Faulty compressor suction valveC.Failure of the high pressure cutoutD.Flash gas formed in the liquid line

题目

Which of the problems listed could cause erosion of the expansion valve disks and seats?

A.Overcharging the system with refrigerant

B.Faulty compressor suction valve

C.Failure of the high pressure cutout

D.Flash gas formed in the liquid line

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 of the listed problems could produce a high absolute pressure within a flash type evaporator?A.production of high salinity distillateB.seawater feed temperature below 165℃C.a leak in the first stage demisterD.a cracked distillate pump vent line

3.单选题Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）A Proper refrigerant chargeB Faulty expansion valveC Insufficient refrigerantD Solenoid valve stuck open

4.The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?A.Faulty thermostatic bypass valveB.Eroded zinc pencils in the heat exchangerC.Steam formation in the expansion tankD.Excessive leakage from jacket water pump seals

参考答案和解析
正确答案：D
更多“Which of the problems listed could cause erosion of the expansion valve disks and seats?A. ”相关问题

  • 第1题：

    单选题
    When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）
    A

    cold fuel oil

    B

    low fuel oil pressure

    C

    low atomizing steam pressure

    D

    water in the fuel oil


    正确答案： C
    解析： 暂无解析

  • 第2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3题：

    单选题
    Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）
    A

    Spring-centered valve

    B

    Unloading valve

    C

    Three-position valve

    D

    Two-position valve


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）
    A

    Production of high salinity distillate

    B

    Seawater feed temperature below 165℃

    C

    A leak in the first stage demister

    D

    A cracked distillate pump vent line


    正确答案： B
    解析： 暂无解析

  • 第5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6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： C
    解析： 暂无解析

  • 第7题：

    单选题
    Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）
    A

    Excessive compression in the cylinder

    B

    A broken intake valve

    C

    A dirty inlet filter element

    D

    An improperly adjusted discharge valve


    正确答案： B
    解析： 暂无解析

  • 第8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9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10题：

    单选题
    Which of the listed design features is found in an exhaust valve and NOT in an intake valve?（）
    A

    Hard alloy steel construction

    B

    Beveled edges on the valve head

    C

    Low alloy steel construction

    D

    Poppet type design


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）
    A

    Carbon build up in the piston ring belt

    B

    Faulty operation of a cylinder un-loader

    C

    Compressor operation in an area of high relative humidity

    D

    Lifting of intercooler rebel valve


    正确答案： D
    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 following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）
    A

    Worn intake valve guides

    B

    Pitted pre-combustion chambers

    C

    Loose valve tappets

    D

    High exhaust back pressure


    正确答案： D
    解析： 暂无解析

  • 第14题：

    单选题
    Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）
    A

    clogged air filter

    B

    compression stroke

    C

    burned exhaust valves

    D

    all of the above


    正确答案： C
    解析： 暂无解析

  • 第15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16题：

    单选题
    If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to （）.
    A

    an overfilled expansion tank

    B

    excess chromate treatment of the jacket water

    C

    a clogged raw water sea suction

    D

    cavitation erosion of the heat exchanger tubes


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）
    A

    Lube oil passing through the system

    B

    Moisture or foreign matter collecting at the valve seat and orifice

    C

    Variable spring tension caused by the changing temperature

    D

    Frost on the liquid line


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）
    A

    Plugged injector nozzles

    B

    Excessive fuel injection

    C

    Very late injection timing

    D

    Incorrect crankshaft clearance


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the following would not cause high suction pressure?（）
    A

    insufficient refrigeration

    B

    leaky suction valves

    C

    expansion valve stuck open

    D

    suction valve not adjusted properly


    正确答案： C
    解析： 暂无解析

  • 第20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21题：

    单选题
    If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）
    A

    The wearing rings are excessively worn

    B

    The suction strainer is clogged

    C

    The discharge valve is clogged

    D

    The shaft is worn


    正确答案： A
    解析： 暂无解析

  • 第22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23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

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