What is an advantage of a gate valve over a butterfly valve ________．A.Less frequent maintenanceB.Faster operationC.CheaperD.More compact

题目

What is an advantage of a gate valve over a butterfly valve ________．

A.Less frequent maintenance

B.Faster operation

C.Cheaper

D.More compact

相似考题

1.The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?A.The profile of the valve is like a globeB.The valve seat is set into the bulbous bodyC.The plug or disc of the valve is made vertical to the axis of the pipeD.The valve seat is located at right side of the plug or disc

2.What type of valve is used to direct the flow of hydraulic fluid?A.relief valveB.direction control valveC.stop valveD.pressure control valve

3.The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.A.butterfly valveB.spectacle valveC.check valveD.globe 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

参考答案和解析
正确答案：A
更多“What is an advantage of a gate valve over a butterfly valve ________.A.Less frequent maint ”相关问题

  • 第1题：

    In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open ________．

    A.Globe valve

    B.Butterfly valve

    C.Gate valve

    D.Packless valve


    正确答案：C

  • 第2题：

    (APS2000)以下哪个LRU的线路故障不会导致“MAINT”灯亮（）

    • A、SPEED  SENSOR
    • B、THERMOCOUPLE
    • C、MAIN  FUEL  VALVE
    • D、BLEED  SERVO  VALVE

    正确答案:D

  • 第3题：

    单选题
    Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）
    A

    the direct acting relief valve is used for controlling lower flows and pressure

    B

    the pilot operated relief valve is used for controlling higher flows and pressure

    C

    the pilot operated relief valve is used for controlling lower flows and pressure

    D

    the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the following statements concerning butterfly valves is correct?（）
    A

    Special tools are required for lapping or grinding

    B

    It is impossible to throttle flow with a butterfly valve

    C

    To close the valve, it is only necessary to turn the handle a quarter of a turn

    D

    The butterfly valve should never be used in a freshwater system


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.
    A

    be fitted with a positive fuel shut-off valve located at the tank

    B

    have a shut-off valve at the top of the tank

    C

    have a gate valve easily accessible in the space where the tank is located

    D

    have a drain cock at the lowest point in the fuel line


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    A gate valve installed in a pipeline should be （）.
    A

    used in either the fully dosed or fully opened position

    B

    installed with the stem down

    C

    used for steam service only

    D

    used to throttle or regulate the flow of liquid


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    Valve lash, or clearance refers to the （）
    A

    clearance between the top of the valve stem and the rocker arm

    B

    compression of the valve springs

    C

    clearance between the valve seat inserts and the head

    D

    out of roundness of the fuel injection cams


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
    A

    suction service valve as a vapor

    B

    suction service valve as a liquid

    C

    discharge service valve as a vapor

    D

    charging valve as a liquid


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.
    A

    discharge is continuous

    B

    it has no internal valves

    C

    upon accidental closing of discharge valve, excessive pressure will not build up

    D

    all of the above are true


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.
    A

    a check valve

    B

    a gate valve

    C

    a pressure reducing valve

    D

    a quick closing valve


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    What is the purpose of a relief valve?（）
    A

    to fill 2 tanks at the same time

    B

    to use pump at a higher pressure

    C

    to return liquid to suction side if discharge valve is closed

    D

    All of the above are true


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.
    A

    stopper

    B

    screen

    C

    filter

    D

    restrictor


    正确答案： D
    解析： 暂无解析

  • 第13题：

    What is an advantage of diesel over steam turbine propulsion ________．

    A.Less fuel consumption per SHP

    B.Diesel fuel costs less than bunker C or its equivalent

    C.Less routine maintenance required

    D.Less weight per SHP


    正确答案：A

  • 第14题：

    单选题
    Which of the valves listed should be used either in the fully opened or the fully closed position?（）
    A

    A gate valve

    B

    A globe valve

    C

    Any check valve

    D

    Any needle valve


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    What type of valve is used to direct the flow of hydraulic fluid?（）
    A

    Relief valve

    B

    Direction control valve

    C

    Stop valve

    D

    Pressure control valve


    正确答案： D
    解析： 暂无解析

  • 第16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17题：

    单选题
    Unlike the globe valve, gate valves give full bore flow without change of direction, such a valve is not suitable to partially open operationAccording to the above sentence, which of the following statements is not true?（）
    A

    The globe valve may be suitable for partially open operation

    B

    The globe valve will give full bore flow with change of direction

    C

    The gate valve gives full bore flow with change of direction

    D

    The gate valve is suitable for full bore operation only


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    What is the purpose of a striker plate? （）
    A

    Provides surface for applying force on machinery

    B

    Provides landing surface for the sounding bob

    C

    Absorbs machinery vibration

    D

    Prevents valve stem over-travel


    正确答案： C
    解析： 暂无解析

  • 第19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20题：

    单选题
    To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.
    A

    discharge service valve as a vapor

    B

    suction service valve as a liquid

    C

    charging valve as a liquid

    D

    condenser purge valve as a vapor


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）
    A

    The diameter of a disc is the same as the outer diameter of the pipe

    B

    We can infer that the valve is opened or closed by rotating the spindle

    C

    A butterfly valve comprises a disc and a ring body

    D

    The profile of the butterfly valve is a ring body


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Valve cages are used on some large diesel engines to （）
    A

    reduce wear on the valve stem

    B

    permit the use of alloy valve seat materials

    C

    reduce heat transfer from the valve seat

    D

    facilitate valve removal for servicing


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）
    A

    governor flyweight action on a pilot valve which controls fuel injection

    B

    governor flyweight motion acting on fuel controls through suitable linkage

    C

    positioning a butterfly valve in the fuel delivery system positioning

    D

    a servomotor piston attached to the fuel controls


    正确答案： C
    解析： 暂无解析

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