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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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更多 “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 operatorB pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzleC push the nozzle handle forward as far as it will goD insert a fog applicator between the fire hose and nozzle” 相关考题
考题
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
考题
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
考题
The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.A.a difference in water pressureB.the method of breaking up the water streamC.the length of the applicatorD.All of the above
考题
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
考题
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
考题
单选题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
考题
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 （）A
the pump supply pressureB
the slope of the fuel camC
how the plunger is rotatedD
the number of sleeve segments engaged with the rack
考题
单选题You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.A
Your speed must be reduced to bare steeragewayB
A look-out is not required if the radar is onC
Fog signals are only required when a vessel is detected by radarD
The radar should always be kept on a short-range scale
考题
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（）.A
Radiation fogB
Frontal fogC
Convection fogD
Advection fog
考题
单选题On the all-purpose nozzle，the position of the valve when the handle is all the way forward is（）.A
shutB
fogC
solid streamD
spray
考题
单选题Water fog from an all-purpose nozzle may be used to（）.A
fight an electrical fireB
fight a magnesium fireC
eliminate smoke from a compartmentD
All of the above
考题
单选题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
考题
单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.A
shield fire fighters from radiant heatB
break up burning materialC
get the most water possible on the fireD
drive heat and smoke ahead of the fire fighters
考题
单选题High-velocity fog（）.A
is a finer，more diffuse water spray than low-velocity fogB
requires that the water pressure be no greater than 60 psiC
produces an effective fog pattern no more than 6 feet beyond the nozzleD
extinguishes a fire by absorbing heat and reducing the supply of oxygen
考题
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（）.A
a difference in water pressureB
the method of breaking up the water streamC
the length of the applicatorD
All of the above
考题
单选题The spray of water in low-velocity fog will have（）.A
greater range than high-velocity fogB
lesser range than high-velocity fogC
about the same range as high-velocity fogD
greater range than a solid stream
考题
单选题A combination or all-purpose nozzle produces（）.A
low-velocity fog onlyB
a solid stream onlyC
a solid stream and foamD
a solid stream and fog
考题
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?（）A
The amount of fuel injected will be increasedB
The start of injection will be retardedC
The nozzle will permit fuel to dribbleD
The spray pattern will be distorted
考题
单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）A
Your speed must be reduced to bare steerage waysB
A look-out is not required if the radar is onC
The radar should always be kept on a short-range scaleD
Fog signals are only required when a vessel is detected by radar
考题
单选题Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）A
high firing pressureB
overload of that particular cylinderC
smoky exhaustD
cooling water temperature rise
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
improper atomization of the fuel
考题
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（）.A
pressure builds up in the nozzle which causes a surge of waterB
the only opening in a passageway is the one from which the nozzle is being advancedC
pressure in the fire hose drops below 100 psiD
a bulkhead collapses due to heat and pressure
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.A
water in the fuel oil supplyB
excessive fuel nozzle holder coolingC
a distorted fuel spray patternD
leakage past the plunger into the oil drain
考题
单选题When approaching a fire from win ward, you should shield firefighters from the fire by using（）A
low-velocity fogB
high-velocity fogC
a straight stream of waterD
foam spray
考题
单选题If not attached to the nozzle,each low-velocity spray applicator on a vessel must be stowed（）.A
in a protected area on the main deckB
inside a machinery space near the entranceC
next to the fire hydrant to which the fire hose is attachedD
on a rack inside the quarters near the entrance
考题
单选题When navigating in thick fog with the radar on，you should（）.A
station the look-out in the wheelhouse to keep a continuous watch on the radarB
secure the sounding of fog signals until a vessel closes within five milesC
station a look-out as low down and far forward as possibleD
keep the radar on the shortest available range for early detection of approaching vessels
考题
单选题The 12-foot low-velocity fog applicator（）.A
has a spray pattern 12 feet in diameterB
can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzlesC
has a 90°bend at its discharge endD
has a screw thread end which connects to the all-purpose nozzle
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