名词解释题Regulating Valve
名词解释题
Regulating Valve
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相关考题：
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
Nonverbal communication can be used as a means of contradicting or regulating verbal communication.() 此题为判断题(对，错)。
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 vaporB.suction service valve as a liquidC.discharge service valve as a vaporD.charging valve as a liquid
单选题The period of valve overlap is when （）.Athe inlet valve is openBthe exhaust valve is openCboth valves are closeDboth valves are open
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?（）Athe direct acting relief valve is used for controlling lower flows and pressureBthe pilot operated relief valve is used for controlling higher flows and pressureCthe pilot operated relief valve is used for controlling lower flows and pressureDthe controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
单选题The C02 flooding system is actuated by a sequence of steps which are（）.Abreak glass，pull valve，break glass，pull cylinder controlBsound evacuation alarm，pull handleCopen bypass valve，break glass，pull handleDopen stop valve，open control valve，trip alarm
单选题In a refrigeration system, foaming of the crankcase oil may cause the （）.Aexpansion valve to overfeedBcompressor to knockCwater regulating valve to failDcrankcase drains to plug
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?（）AThe globe valve may be suitable for partially open operationBThe globe valve will give full bore flow with change of directionCThe gate valve gives full bore flow with change of directionDThe gate valve is suitable for full bore operation only
单选题If a refrigeration compressor will not start, the reason may be （）.Athe pressure regulating valve is not closingBan excessive lack of refrigerant in the systemCbadly leaking discharge valvesDworn piston rings
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve
单选题The valve which is most suited for regulating the flow through a pipeline is a （）Agate valveBglobe valveCswing-check valveDplug-cock valve
单选题If the head pressure is too high,（）Athe relief valve should open before the high-pressure cutoutBthe relief valve should open and let excess refrigerant go to receiverCthe high-pressure cutout switch should operate before the relief valve opensDclose in on the suction valve
单选题A governor automatically controls engine speed by regulating （）.Afuel supplyBfiring orderCengine loadDoil level
单选题Valve lash, or clearance refers to the （）Aclearance between the top of the valve stem and the rocker armBcompression of the valve springsCclearance between the valve seat inserts and the headDout of roundness of the fuel injection cams
单选题A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.Aevaporator pressure decreaseBevaporator coil over-feedCevaporator capacity increaseDexpansion valve diaphragm rupture
单选题To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）Asuction service valve as a vaporBsuction service valve as a liquidCdischarge service valve as a vaporDcharging valve as a liquid
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）Aworn valve seatsBworn main bearingCexcessive valve clearanceDweak rocker arm springs
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 （）.Achange the expansion valve adjustmentBreadjust the water regulating valve to increase the flow of waterCpurge air from the condenserDclean the waterside of the condenser
单选题In a refrigeration system, if the cooling water to the condenser fails, the（）.Abox temperature solenoid valve will closeBexpansion valve will closeCcompressor will shutdownDking valve will open
单选题The low pressure side of a refrigeration system is considered to exist from the （）.Aexpansion valve to the compressorBreceiver to the expansion coilCexpansion valve to the evaporatorDcondenser to the expansion valve
单选题Valve cages are used on some large diesel engines to （）Areduce wear on the valve stemBpermit the use of alloy valve seat materialsCreduce heat transfer from the valve seatDfacilitate valve removal for servicing
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）Aone valve seats upwards, while the other seats downwardsBthe reed valves used on the discharge are made substantially thicker and heavier than the suction valvesCthe suction valve springs exert a greater tension than the discharge valve springsDthe discharge valve springs exert a greater tension than the suction valve springs