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单选题
High-velocity fog（）.
A
is a finer，more diffuse water spray than low-velocity fog
B
requires that the water pressure be no greater than 60 psi
C
produces an effective fog pattern no more than 6 feet beyond the nozzle
D
extinguishes a fire by absorbing heat and reducing the supply of oxygen
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Dense fog comes with bad visibility, fog signal bell must be kept ________at regulation intervalsA.to goB.goingC.goesD.go
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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
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
单选题The ship should reduce speed in the thick fog because of（）.A
the poor visibilityB
the fog signalsC
the fast speedD
the good sight
考题
单选题What is the use of the books of Admiralty List of Lights and Fog Signals? Their use is to （）.A
Mention signal stations and ice，storm，traffic and port signalsB
Give the international numbers of lightsC
Give the correction of the lights and fog signalsD
Give the information on the lights and fog signals
考题
单选题Which vessel is the stand-on vessel when two vessels crossing in fog are NOT in sight of one another（）.A
The vessel which has the other on her own starboard sideB
The vessel which has the other on her own port sideC
The one which hears the other's fog signal firstD
Neither vessel is the stand-on vessel
考题
单选题The fog most commonly encountered at sea is called（）.A
conduction fogB
radiation fogC
frontal fogD
advection fog
考题
单选题Radiation fog is more commonly encountered in（）.A
springB
later winterC
autumnD
end of summer
考题
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
考题
单选题A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.A
using a 2-1/2 inch hoseB
there is an outlet for the smoke and heatC
the fire is totally contained by the ship's structureD
at least two fog streams can be used
考题
单选题A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.A
no fog signalB
one short blastC
one prolonged and three short blastsD
one prolonged，one short，and one prolonged blast
考题
单选题An instrument useful in predicting fog is the（）.A
sling psychrometerB
microbarographC
anemometerD
aneroid barometer
考题
单选题Which kind of fog is also named as ground fog?（）A
AdvectionB
Radiation fogC
frontal fogD
Steam fog
考题
单选题（）gives listings of all lighthouses，lightships，lit floating marks（over 8m in height），fog signals and lights of navigational significance.A
Ocean Passages for the WorldB
Admiralty List of Radio SignalsC
IALA Maritime Buoyage SystemD
Admiralty List of Lights and Fog Signals
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A low，uniform layer of cloud resembling fog，but not resting on the ground，is called（）.A
cumulusB
nimbusC
stratusD
cirrus
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
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