Every vent system outlet to atmosphere from a valve shall be located as high and at the furthest distance from a source of ignition as is practicable ______．A.low and at the shortest distanceB.low and at the furthest distanceC.high and at the shortest distanceD.high and at the furthest distance
Every vent system outlet to atmosphere from a valve shall be located as high and at the furthest distance from a source of ignition as is practicable ______．
A.low and at the shortest distance
B.low and at the furthest distance
C.high and at the shortest distance
D.high and at the furthest distance
相关考题：
第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.The passage is mainly aboutA.crankcase explosionB.scavenge box fireC.starting air pipeD.the danger of explosion in the starting air system
One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier isA.seal water supply be cut offB.make-up water supply be cut offC.oil outlet valve closed or not open sufficientlyD.the flow rate of oil is too much
The wooden plug inserted in the vent of a damaged tank should be removed if you are going to ______.A.pump from the damaged tankB.fight a fireC.abandon shipD.use the crossover system
What is a requirement for remote manual shutdown stations for internal combustion engine driven cargo pumps on tank barges ________．A.They must be conspicuously markedB.They must be located at least 10 feet from the engineC.There must be at least two such shutdown devicesD.The valve rods shall be fitted with stuffing boxes
单选题Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.Acargo pump failureBblower failureCdeck seal low water levelDlow inert gas temperature
单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.AOverflow valveBReducing valveCBalancing valveDReducing valve or balancing valve
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A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.Adamage from crane operationsBbeing used for wash down purposesCaccidental diversion of flow to wrong locationDfreezing
单选题As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.Athe inlet valveBthe outlet valveCboth the inlet valve and the outlet valveDthe pump inlet valve
单选题Air or noncondensable gas is removed from a refrigeration system by a （）Aseparating chamberBsystem of bafflesCpurge valveDvacuum reducing valve
单选题Vessels shall be deemed to be in sight of one another only when one（）from the other.Acan be observed visuallyBcan be observed by radarCcan be located on the radarDcan be heard
单选题In order to maintain a constant outlet water temperature of 80-85℃ from the engine, a three-way valve is installed（）Aat the jacket cooler outlet to control the flux through the engineBat the jacket cooler outlet to control the flux through the coolerCat the engine outlet to control the flux through the engineDat the engine inlet to control the flux through the engine
单选题（）can cause oil flow from water outlet of a separator.AOil inlet valve opening too quicklyBOil temperature too highCDiameter of gravity disc too smallDViscosity of oil too low
单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.Acylinder head water outlet headerBcylinder jacket inlet mainCheat exchanger inlet connectionDjacket water pump suction line
单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）ACondenser and thermal expansion valveBKing and solenoid valvesCCompressor and thermal expansion valveDCondenser and solenoid valve
单选题Which statement is TRUE concerning the ventilation of engine and fuel tank compartments on uninspected towing vessels using fuel with a flash point of 100°F?（）AThere shall be at least 3 ventilator ducts open to the atmosphereBAt least one exhaust duct shall extend from the open atmosphere to the lower portion of the bilgeCAt least one intake duct shall extend from the open atmosphere to the lower portion of the bilgeDOnly vessels using fuel with a flash point above 110°F need ventilate engine and fuel compartments
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 a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）Araw water pump dischargeBexpansion tank outletCcooling water heat exchangerDoutlet engine jacket water outlet
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor
单选题If one of the bilge system manifold valves does not properly seat, the （）Abilge well connected to that valve, plus the second bilge well being pumped will be completely emptiedBbilge system will lose vacuum and prevent the other bilges from being pumped outCbilge well aft connected to that valve will siphon its contents to the forward bilge wellsDdischarge pressure will be too high
单选题One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）Aseal water supply be cut offBmake up water supply be cut offCoil outlet valve closed or not open sufficientlyDthe flow rate of oily water is too much
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.Achange the expansion valve adjustmentBreadjust the water regulating valve to increase the flow of waterCpurge air from the condenserDclean the waterside of the condenser
单选题An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.Acause loss of hydraulic oil from the systemBresult in extreme damage to the pumpCcause damage to the pump ff not continually drained from the pump casingDresult in the system high side pressure to substantially drop off
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?（）AThe 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 unloadedBThe solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedCWhen 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 unloadDThe 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
单选题The wooden plug inserted in the vent of a damaged tank should be removed if you are going to （）.Apump from the damaged tankBfight a fireCabandon shipDuse the crossover system
单选题The low pressure side of a refrigeration system is considered to exist from the （）.Aexpansion valve to the compressorBreceiver to the expansion coilCexpansion valve to the evaporatorDcondenser to the expansion valve
单选题The wooden plug inserted in the vent of a damaged tank of a ship should be removed in case it is decided to（）.Apump from the damaged tankBfight a fireCabandon the rigDuse the crossover system