单选题Water fog from an all-purpose nozzle may be used to（）.Afight an electrical fireBfight a magnesium fireCeliminate smoke from a compartmentDAll of the above
单选题
Water fog from an all-purpose nozzle may be used to（）.
A
fight an electrical fire
B
fight a magnesium fire
C
eliminate smoke from a compartment
D
All of the above
参考解析
解析：
暂无解析
相关考题：
29． The writer thinks that people in large cities should __________ ．A． stop the used water from getting into undergroundB． only use the water from the riversC． make their used water clean againD． use as much sea water as possible
The cooling liquid used for the cylinder may be referred to as _____.A.jacket waterB.make-up waterC.boiler waterD.flushing water
One advantage of the all-purpose nozzle is that it ______.A.can fit any size hoseB.converts a stream of water into a fogC.increases the amount of water reaching the fireD.can spray two streams of water at the same time
Which two statements are true about the use of the procedures listed in the vsysaux_occupants.move_procedure column?() A. The procedure may be used for some components to relocate component data to the SYSAUX tablespace from its current tablespace.B. The procedure may be used for some components to relocate component data from the SYSAUX tablespace to another tablespace.C. All the components may be moved into SYSAUX tablespace.D. All the components may be moved from the SYSAUX tablespace.
The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.A.a difference in water pressureB.the method of breaking up the water streamC.the length of the applicatorD.All of the above
If a firefighting situation calls for low-velocity fog you would ______．A.order the engine room to reduce pressure on the fire pumpB.put the lever on an all-purpose fire nozzle all the way forwardC.attach a low-velocity fog applicator with the nozzle shut downD.put the lever on an all-purpose fire nozzle all the way back
The high-velocity fog tip used with the all-purpose fire fighting nozzle should always be ______．A.Attached by a chainB.Coated with heavy grease to prevent corrosionC.Painted red for identity as emergency equipmentD.Stored in the clip at each fire station
The number and position of hydrants arranged on board shall be such that _______，one of which shall be from a single length of hose，may reach any part of the ship normally accessible to the passengers or crew while the ship is being navigated．A.at least two jets of water which shall be from the same length of hoseB.at least two jets of water emanating from the same hydrantC.at least two jets of water not emanating from the same hydrantD.at least two jets of water not emanating from the same hydrant，one of which shall be from a single length of hose
单选题If a firefighting situation calls for low-velocity fog you would（）.Aorder the engine room to reduce pressure on the fire pumpBput the lever on an all-purpose fire nozzle all the way forwardCattach a low-velocity fog applicator with the nozzle shut downDput the lever on an all-purpose fire nozzle all the way back
单选题On the all-purpose nozzle，the position of the valve when the handle is all the way forward is（）.AshutBfogCsolid streamDspray
单选题Which statement concerning the collection of fresh water is FALSE?（）AFresh water may be obtained from fishBlifeboat covers or canopies should be washed with rain before drinking water is collectedCFresh water may be collected from condensation inside the life-raftDFreshwater cannot be produced from standing seawater
单选题On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.Aacrylic acidBbenzeneColeumDvinyl toluene
单选题One advantage of the all-purpose nozzle is that it（）.Acan fit any size hoseBconverts a stream of water into a fogCincreases the amount of water reaching the fireDcan spray two streams of water at the same time
单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.Ashield fire fighters from radiant heatBbreak up burning materialCget the most water possible on the fireDdrive heat and smoke ahead of the fire fighters
单选题The all-purpose nozzle will produce a fog spray when you（）.Apull the nozzle handle all the way back toward the operatorBpull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzleCpush the nozzle handle forward as far as it will goDinsert a fog applicator between the fire hose and nozzle
单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题As the air passes through the charge air cooler, its temperature may be reduced and moisture condensed, with the condensate in danger of being carried into the engineSo a water separator should be mounted beneath the bottom part of the engine inlet manifoldA water separator is used in order to （）.Akeep the air from being carried into the engineBkeep the moisture from being condensedCkeep the danger from being carded into the engineDtake away the condensate from the air
单选题The cooling liquid used for the cylinder may be referred to as （）.Ajacket waterBmake-up waterCboiler waterDflushing water
单选题The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to（）.Aa difference in water pressureBthe method of breaking up the water streamCthe length of the applicatorDAll of the above
单选题The reciprocating pump can’t draw water from a tank may be caused by （）.Aleaky pipeBopened inlet valveCtoo much water in tankDNone of the above
单选题A combination or all-purpose nozzle produces（）.Alow-velocity fog onlyBa solid stream onlyCa solid stream and foamDa solid stream and fog
单选题You may find the time of slack water after low water in a certain port from（）.ADeadweight ScaleBTide TablesCNotices to MarinersDTable of Azimuth
单选题Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）Ahigh firing pressureBoverload of that particular cylinderCsmoky exhaustDcooling water temperature rise
单选题When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.Apressure builds up in the nozzle which causes a surge of waterBthe only opening in a passageway is the one from which the nozzle is being advancedCpressure in the fire hose drops below 100 psiDa bulkhead collapses due to heat and pressure
单选题Which statement concerning the collection of fresh water is FALSE?（）AFresh water may be obtained from fishBLifeboat covers or canopies should be washed with rain before drinking water is collectedCFresh water may be collected from condensation inside the liferaftDSeawater should never be consumed
单选题The 12-foot low-velocity fog applicator（）.Ahas a spray pattern 12 feet in diameterBcan be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzlesChas a 90°bend at its discharge endDhas a screw thread end which connects to the all-purpose nozzle