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 all-purpose nozzle will produce a fog spray when you().
A

pull the nozzle handle all the way back toward the operator

B

pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzle

C

push the nozzle handle forward as far as it will go

D

insert a fog applicator between the fire hose and nozzle


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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

A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started?A.When the towing vessel enters the fogB.When the drilling rig enters the fogC.When the towing vessel can no longer be seen from the rigD.Immediately

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

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In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward stroke of the plunger depends on ()Athe pump supply pressureBthe slope of the fuel camChow the plunger is rotatedDthe number of sleeve segments engaged with the rack

单选题You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?().AYour speed must be reduced to bare steeragewayBA look-out is not required if the radar is onCFog signals are only required when a vessel is detected by radarDThe radar should always be kept on a short-range scale

单选题The type of fog that occurs on clear nights with very light breezes and forms when the earth cools rapidly by radiation is known as().ARadiation fogBFrontal fogCConvection fogDAdvection fog

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High-velocity fog().Ais a finer,more diffuse water spray than low-velocity fogBrequires that the water pressure be no greater than 60 psiCproduces an effective fog pattern no more than 6 feet beyond the nozzleDextinguishes a fire by absorbing heat and reducing the supply of oxygen

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 spray of water in low-velocity fog will have().Agreater range than high-velocity fogBlesser range than high-velocity fogCabout the same range as high-velocity fogDgreater range than a solid stream

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Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?()AThe amount of fuel injected will be increasedBThe start of injection will be retardedCThe nozzle will permit fuel to dribbleDThe spray pattern will be distorted

单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?()AYour speed must be reduced to bare steerage waysBA look-out is not required if the radar is onCThe radar should always be kept on a short-range scaleDFog signals are only required when a vessel is detected by radar

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Faulty operation of diesel engine fuel injection nozzles can be a direct cause of().Aexcessive fuel nozzle holder coolingBsediment in the fuel supplyCdistortion of the fuel spray patternDimproper atomization of the fuel

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单选题When approaching a fire from win ward, you should shield firefighters from the fire by using()Alow-velocity fogBhigh-velocity fogCa straight stream of waterDfoam spray

单选题If not attached to the nozzle,each low-velocity spray applicator on a vessel must be stowed().Ain a protected area on the main deckBinside a machinery space near the entranceCnext to the fire hydrant to which the fire hose is attachedDon a rack inside the quarters near the entrance

单选题When navigating in thick fog with the radar on,you should().Astation the look-out in the wheelhouse to keep a continuous watch on the radarBsecure the sounding of fog signals until a vessel closes within five milesCstation a look-out as low down and far forward as possibleDkeep the radar on the shortest available range for early detection of approaching vessels

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