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Ball valve
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更多 “Ball valve” 相关考题
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
考题
The CO2 flooding system is actuated by a sequence of steps which are ______.A.break glass, pull valve, break glass, pull cylinder controlB.sound evacuation alarm, pull handleC.open bypass valve, break glass, pull handleD.open stop valve, open control valve, trip alarm
考题
interface Playable {void play();}interface Bounceable {void play();}interface Rollable extends Playable, Bounceable {Ball ball = new Ball("PingPang");}class Ball implements Rollable {private String name;public String getName() {return name;}public Ball(String name) {this.name = name;}public void play() {ball = new Ball("Football");System.out.println(ball.getName());}}这个错误不容易发现。
考题
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 vaporB.suction service valve as a liquidC.discharge service valve as a vaporD.charging valve as a liquid
考题
单选题The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.A
be jammedB
be openedC
be seatedD
be broken
考题
单选题The period of valve overlap is when （）.A
the inlet valve is openB
the exhaust valve is openC
both valves are closeD
both valves are open
考题
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 pressureB
the pilot operated relief valve is used for controlling higher flows and pressureC
the pilot operated relief valve is used for controlling lower flows and pressureD
the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
考题
单选题In order for the automatic lifeboat drain to operate properly（）.A
the cap should be removed to drain the boat when it is waterborneB
the cage must be free of rubbish or the ball may not seat properlyC
there is an automatic ball check located in a siphon tubeD
the small lever to release the rubber ball float must be turned counterclockwise
考题
单选题The C02 flooding system is actuated by a sequence of steps which are（）.A
break glass，pull valve，break glass，pull cylinder controlB
sound evacuation alarm，pull handleC
open bypass valve，break glass，pull handleD
open stop valve，open control valve，trip alarm
考题
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 operationB
The globe valve will give full bore flow with change of directionC
The gate valve gives full bore flow with change of directionD
The gate valve is suitable for full bore operation only
考题
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
考题
单选题关于克隆影片剪辑实例的语句命令duplicateMovieClip（“ball”， “ball”+2，1），该语句完成的功能是（）。A
将舞台上的实例ball克隆，将生成的实例命名为ball并放置在第1层B
将舞台上的实例ball克隆，将生成的实例命名为ball2并放置在第1层C
将舞台上的实例ball克隆，将原来的ball实例删除D
将舞台上的实例ball克隆，将原来的ball实例重新命名为ball2
考题
单选题Which display indicates a vessel conducting mineclearance operations（）.A
Three balls in a vertical lineB
Two balls in a vertical lineC
One ball near the foremast and one ball at each yardarmD
One diamond near the foremast and one ball at each yardarm
考题
单选题If the head pressure is too high,（）A
the relief valve should open before the high-pressure cutoutB
the relief valve should open and let excess refrigerant go to receiverC
the high-pressure cutout switch should operate before the relief valve opensD
close in on the suction valve
考题
单选题Valve lash, or clearance refers to the （）A
clearance between the top of the valve stem and the rocker armB
compression of the valve springsC
clearance between the valve seat inserts and the headD
out of roundness of the fuel injection cams
考题
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 decreaseB
evaporator coil over-feedC
evaporator capacity increaseD
expansion valve diaphragm rupture
考题
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 vaporB
suction service valve as a liquidC
discharge service valve as a vaporD
charging valve as a liquid
考题
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 vaporB
suction service valve as a liquidC
charging valve as a liquidD
condenser purge valve as a vapor
考题
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）A
worn valve seatsB
worn main bearingC
excessive valve clearanceD
weak rocker arm springs
考题
单选题In a refrigeration system, if the cooling water to the condenser fails, the（）.A
box temperature solenoid valve will closeB
expansion valve will closeC
compressor will shutdownD
king valve will open
考题
单选题The low pressure side of a refrigeration system is considered to exist from the （）.A
expansion valve to the compressorB
receiver to the expansion coilC
expansion valve to the evaporatorD
condenser to the expansion valve
考题
单选题Valve cages are used on some large diesel engines to （）A
reduce wear on the valve stemB
permit the use of alloy valve seat materialsC
reduce heat transfer from the valve seatD
facilitate valve removal for servicing
考题
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A
one valve seats upwards, while the other seats downwardsB
the reed valves used on the discharge are made substantially thicker and heavier than the suction valvesC
the suction valve springs exert a greater tension than the discharge valve springsD
the discharge valve springs exert a greater tension than the suction valve springs
考题
单选题A vessel conducting mine clearing operations will show（）.A
three balls in a vertical lineB
two balls in a vertical lineC
one ball near the foremast and one ball at each fore yardD
one diamond near the foremast head and one ball at each fore yard
考题
单选题The solenoid valve can be typed as a（）A
thermal valveB
magnetic stop valveC
bellows valveD
bimetallic valve
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