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）
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 stopper
B
flame screen
C
flame filter
D
flame restrictor
参考答案
参考解析
解析：
暂无解析
更多 “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” 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
What type of valve is used to direct the flow of hydraulic fluid?A.relief valveB.direction control valveC.stop valveD.pressure control 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
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
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
Before discharge of cargo tank ballast is undertaken，______．A.the deck isolating valve is openB.flue gas isolating valveC.blower suction valveD.blower discharge valve
考题
单选题The opening or closing of the cylinder starting valve is controlled by （）.A
the starting air distributorB
the cut-off valve on the air mainC
the main starting valveD
the air bottle control valve
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What is a characteristic of all centrifugal cargo pumps? （）A
They are self-primingB
Decreasing the speed of rotation will decrease the discharge pressureC
Opening the discharge valve wider will increase the discharge pressureD
All of the above
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
单选题In （） pumps a closed discharge valve will cause bursting discharge pressure.A
centrifugalB
plungerC
injectorD
water
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According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.A
pressure vacuum relief valvesB
excess flow valvesC
safety relief valvesD
flame screens
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
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The valve on the discharge side of a cargo pump on a tanker will usually be a（）.A
butterfly valveB
spectacle valveC
check valveD
globe valve
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The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.A
closely observe the pump discharge temperatureB
close off the discharge valve, and watch for a rise in pressureC
momentarily close off the suction valve, and watch for a rise in pressureD
use a clamp on ammeter and compare the readings to past records
考题
单选题Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.A
a sea water chestB
a change-over chestC
a buffer tankD
a three-way valve
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The diesel engine valve subjected to most severe conditions of service is the （）.A
cylinder exhaust valveB
air starting valveC
air inlet valveD
cylinder relief valve
考题
单选题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
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
热门标签
最新试卷
