To ensure proper seating when closing a valve on a tank，the valve should be ______．A.Set up as tight as possible by handB.Set up tight using a valve wrenchC.Closed，opened a half turn，and then closedD.Closed against the stop and the locking pin inserted
To ensure proper seating when closing a valve on a tank，the valve should be ______．
A.Set up as tight as possible by hand
B.Set up tight using a valve wrench
C.Closed，opened a half turn，and then closed
D.Closed against the stop and the locking pin inserted
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
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
You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take?A.Cut in another IG fan to increase gas flowB.Open the pressure control valve until the pressure increasesC.Open the tank isolation valve to the fully open positionD.Reduce the pumping rate
The crude oil overflowed from measuring-hole due to ______ the valve of No.1 tank．A.not closeB.not closingC.not have closedD.no closing
单选题Your vessel is taking on bunkers from a shore side facility, if oil begins flowing from one tank vent, which of the following actions should be taken FIRST?（）AOpen the intake valve to an adjacent tankBSet out drip pans and sawdust and begin to mop up the spillCSignal the shore control point to shutdownDClose the valve on the tank vent line
单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.Aa subsequent temperature rise will cause the cargo to overflowBair pockets may cause the cargo to bubble out of the ullage holeCthe increased viscosity of the product requires higher loading pressure which increases the chances of a spillDthe tank valve may be stiff and a spill will occur before the valve can be closed
单选题The opening or closing of the cylinder starting valve is controlled by （）.Athe starting air distributorBthe cut-off valve on the air mainCthe main starting valveDthe air bottle control valve
单选题A substantial increase in crankcase pressure could be an indication of （）Aexcessive lube oil pressureBthe proper seating of new ringsCa worn cylinder linerDa malfunctioning cylinder relief valve
单选题When operating the air supply system in a covered lifeboat the（）.Afuel supply valve should be closedBhatches，doors，and oar ports should be closedCair cylinder shut-off valve should be closedDengine should be shut off
单选题Your vessel is at a dock taking bunkers through a pipe laid down on the dock. If oil begins to flow out of a tank vent，what should you do FIRST?（）AOpen the intake valve to an adjacent tankBSet out drip pans and sawdust and begin to mop up the spillCSignal the shore control point to shut downDClose the valve on the tank vent line
单选题If a refrigeration system compressor crankcase is sweating, you should （）.Aadd refrigerant to the systemBadjust the thermal expansion valve to the proper settingCadjust the float valve to the proper holding pressureDopen the hand expansion valve
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The crude oil overflowed from measuring-hole due to（）the valve of No.1 tank.Anot closeBnot closingCnot have closedDno closing
单选题The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.AdecreasedBincreasedCfixedDclosed
单选题Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.Abe fitted with a positive fuel shut-off valve located at the tankBhave a shut-off valve at the top of the tankChave a gate valve easily accessible in the space where the tank is locatedDhave a drain cock at the lowest point in the fuel line
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In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.Aopen and individual tank valves openBopen and the individual tank valves closedCclosed and the individual tank valves closedDclosed and the individual tank valves open
单选题Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）Alater and closing earlierBlater and closing laterCearlier and closing earlierDearlier and closing later
单选题When ship in the dock repairing, engine department should emphasize on the inspection of（）Asea valve chest, sect valve, thrusterBbilge motherboard, steering and the shaft systemCsea water systemDfresh water system
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 action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）AThe tank must be gas freedBThe tank must be ballastedCThe tank must be vented to the atmosphereDThe bypass valve must also be closed
单选题You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take? （）ACut in another IG fan to increase gas flowBOpen the pressure control valve until the pressure increasesCOpen the tank isolation valve to the fully open positionDReduce the pumping rate
单选题When the heat load begins to increase, the needle valve of an expansion valve will（）Amove in an opening directionBmove in a closing directionCeither open or closeDnot move at all
单选题When starting a centrifugal pump, the discharge valve should be （）.AclosedBopened fullyCcracked openDpartly open
单选题When the refrigeration demand is small,（）Athe expansion valve will move toward the wide open positionBthe expansion valve will move toward the closing positionCthe feeler bulb will conveys the high temperatureDthe superheat degree will raise
单选题In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.Aopen and individual tank valves openBopen and the individual tank valves closedCclosed and the individual tank valves closedDclosed and the individual tank valves open
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