网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
参考答案
更多 “ A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame ______.A.stopperB.screenC.filterD.restrictor ” 相关考题
考题
If the head pressure of a reciprocating refrigeration compressor is excessiveA.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 the discharging valve
考题
An over-speed safety device is usually fitted to a generator engine for ___ in the event of over-speed.A.stabilizing the ship speedB.increasing the fuel pump settingC.braking the crankshaftD.cutting power off the engine
考题
The amount of LFG that may be loaded into a given tank is determined by ______．A.Checking the loading sheetB.Loading to within 1 percent of outageC.Loading to within 10 percent of the safety relief valve settingD.Filling to the maximum level indicated on the liquid level gaging device
考题
What is a cofferdam ________．A.Tube fitted to an ullage holeB.Area the product is loaded intoC.Void or empty space separating two tanksD.Opening in the deck used for cleaning a tank
考题
In order to discharge a CO2 portable fire extinguisher, the operator must FIRST ______.A.invert the CO2 extinguisherB.squeeze the two trigger handles togetherC.remove the locking pinD.open the discharge valve
考题
What are two advantages that the Cisco SA 520 all-in-one UTM security device has over implementing a typical router in a small business network？（）A、 Cisco Intrusion Prevention SystemB、 higher bandwidthC、 virtual private networksD、 access control listsE、 URL filtering
考题
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（）.A
flame stopperB
flame screenC
flame filterD
flame restrictor
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The（） is fitted in pair one is the main valve, the other the auxiliary or standby.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题In a full flow type lube oil system, the bypass relief valve will lift due to （）A
a clogged filter elementB
excessive lube oil pump discharge pressureC
excessive lube oil flowD
excessively hot lube oil
考题
多选题What are two advantages that the Cisco SA 520 all-in-one UTM security device has over implementing a typical router in a small business network？（）ACisco Intrusion Prevention SystemBhigher bandwidthCvirtual private networksDaccess control listsEURL filtering
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The usual symptoms of cavitation in a centrifugal pump is （）.A
noise and vibrationB
an increase in discharge pressureC
an increase in suction pressureD
lifting of the relief valve
考题
单选题The amount of LFG that may be loaded into a given tank is determined by（）.A
checking the loading sheetB
loading to within 1 percent of outageC
loading to within 10 percent of the safety relief valve settingD
filling to the maximum level indicated on the liquid level gaging device
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
多选题In which two locations in an enterprise network can an IPS sensor be placed?（）Abridging VLANs on two switchesBbridging two VLANs on one switchCbetween two Layer 2 devices withtrunkingDbetween two Layer 2 devices withouttrunkingEbetween a Layer 2 device and a Layer 3 device withtrunking
考题
多选题In which two locations in an enterprise network can an IPS sensor be placed？（）Abridging VLANs on two switchesBbridging two VLANs on one switchCbetween two Layer 2 devices with trunkingDbetween two Layer 2 devices without trunkingEbetween a Layer 2 device and a Layer 3 device with trunking
考题
单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
between the pump and suction valve
考题
单选题One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the （）.A
motor overload will openB
relief valve will openC
pump will overheatD
motor will overheat
考题
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 valveB
a gate valveC
a pressure reducing valveD
a quick closing valve
考题
单选题In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）A
The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloadedB
The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedC
When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unloadD
The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
考题
单选题What is the purpose of a relief valve?（）A
to fill 2 tanks at the same timeB
to use pump at a higher pressureC
to return liquid to suction side if discharge valve is closedD
All of the above are true
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In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）A
fuel valves；exhaust valveB
exhaust valves；inlet valveC
fuel valves；inlet valveD
exhaust valves；fuel valve
考题
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
stopperB
screenC
filterD
restrictor
考题
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.A
a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
考题
单选题In order to discharge a C02 portable fire extinguisher , the operator must first（）.A
invert the CO extinguisherB
squeeze the two trigger handles togetherC
remove the locking pinD
open the discharge valve
热门标签
最新试卷
