What is the purpose of the relief valve of a cargo pump ________．A.Provides for the removal of vaporsB.Allows two or more tanks to be filled at the same timeC.Provides for the emergency shutdown of the pumpD.Permits the return of cargo to the suction side of the pump
What is the purpose of the relief valve of a cargo pump ________．
A.Provides for the removal of vapors
B.Allows two or more tanks to be filled at the same time
C.Provides for the emergency shutdown of the pump
D.Permits the return of cargo to the suction side of the pump
相关考题：
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
What type of valve is used to direct the flow of hydraulic fluid?A.relief valveB.direction control valveC.stop valveD.pressure control valve
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
A cargo hose is marked with the ______．A.maximum working pressureB.bursting pressureC.safety relief valve settingD.maximum temperature
Cargo pump relief valves are piped to the ______．A.cargo pump pressure gaugesB.crossover lines interconnecting two pumpsC.suction side of pumpsD.atmosphere through pump vents
What is the purpose of pressure-vacuum relief valves ________．A.Regulation of discharge pressure from cargo pumpsB.Maintaining constant velocity in cargo linesC.Regulation of suction head on cargo pumpsD.To maintain a tank or void at atmospheric pressure
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.Aram relief valves bypass oil to stop rudder movementBsix-way valve shifts to the neutral flow positionCsteering pump electric motor is de - energized by the transfer switchDfollow-up gear takes the hydraulic pump off stroke
单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）AThe six-way valve opensBThe steering service pump motor is stoppedCThe follow-up gear takes the pump off strokeDThe cylinder relief valves bypass oil to the suction side the pump
单选题（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.AA relief valveBAn alarmCA pressure gaugeDA non-maim valve
单选题What is the purpose of pressure-vacuum relief valves? （）ARegulation of discharge pressure from cargo pumpsBMaintaining constant velocity in cargo linesCRegulation of suction head on cargo pumpsDTo maintain a tank or void at atmospheric pressure
单选题Cargo pump relief valves are piped to the（）.Acargo pump pressure gaugesBcrossover lines interconnecting two pumpsCsuction side of pumpsDatmosphere through pump vents
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When loading bulk liquid cargo，what is the FIRST action you should take if a cargo valve jammed open?（）ATrip the pump relief valveBOrder the dock man to shut downCCall the owner，operator，or terminal supervisorDRun out the vessel's or terminal's fire hose
单选题A cargo hose is marked with the（）.Amaximum working pressureBbursting pressureCsafety relief valve settingDmaximum temperature
单选题In a full flow type lube oil system, the bypass relief valve will lift due to （）Aa clogged filter elementBexcessive lube oil pump discharge pressureCexcessive lube oil flowDexcessively hot lube oil
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 usual symptoms of cavitation in a centrifugal pump is （）.Anoise and vibrationBan increase in discharge pressureCan increase in suction pressureDlifting of the relief 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What is the purpose of a striker plate? （）AProvides surface for applying force on machineryBProvides landing surface for the sounding bobCAbsorbs machinery vibrationDPrevents valve stem over-travel
单选题Your tanker is designed to carry anhydrous ammonia in bulk.The keel was laid in 1980.Which statement concerning the carriage of this cargo is TRUE（）.AA flammable gas detection system must be installed in each cargo pump roomBTanks may not be located on deckCCarriage of this cargo is authorized by issuance of an IMO CertificateDAluminum and copper alloys are prohibited from being in valve parts in contact with the cargo
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）AWhen the helm is at any angle other than amidshipsBWhen the six-way valve is openedCWhen the ram relief valves liftDWhen the redder angle is different from the position of the helm
单选题A relief valve for a cargo pump is generally installed（）.Aafter the discharge valveBbetween the pump and discharge valveCafter the suction valveDbetween the pump and suction valve
单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.Aassist in a quick cutoff of fuel injectionBallow oil backflow from the injector to the helixCreduce fuel oil pressure between injection strokesDmeter the quantity of fuel delivered
单选题The valve on the discharge side of a cargo pump on a tanker will usually be a（）.Abutterfly valveBspectacle valveCcheck valveDglobe valve
单选题What is the purpose of a relief valve?（）Ato fill 2 tanks at the same timeBto use pump at a higher pressureCto return liquid to suction side if discharge valve is closedDAll of the above are true
单选题The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.Abutterfly valveBspectacle valveCcheck valveDglobe valve
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.Aa low load on the unitBa clogged pump suction strainerCa blockage in the line between the pump and hydraulic motorDthe hydraulic motor turning too fast