更多"The spray of water in low-velocity "的相关试题:
[单项选择]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
[单项选择]Which effect does speed through the water have on a vessel which is underway in shallow water （）.
A. A decrease in the speed results in a decrease in steering response and maneuverability
B. An increase in speed results in the stern sucking down lower than the Bow
C. An increase in speed results in the vessel rising on an even plane
D. A decrease in speed results in the vessel sucking down on an even plane
[单项选择]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
[单项选择]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 pressure
B. the method of breaking up the water stream
C. the length of the applicator
D. All of the above
[单项选择]The primary method by which water spray puts out fires is by（）.
A. removing the oxygen
B. cooling the fire below the ignition temperature
C. removing combustible material
D. diluting combustible vapors
[单项选择]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 ways
B. A look-out is not required if the radar is on
C. The radar should always be kept on a short-range scale
D. Fog signals are only required when a vessel is detected by radar
[单项选择]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 steerageway
B. A look-out is not required if the radar is on
C. Fog signals are only required when a vessel is detected by radar
D. The radar should always be kept on a short-range scale
[单项选择]I have（）below water line.
A. the leaked
B. leakage
C. leaking
D. leak
[单项选择]I have（）damage below water line.
A. large
B. big
C. important
D. major
[单项选择]If you have to jump in the water when abandoning a vessel，your legs should be（）.
A. spread apart as far as possible
B. held as tightly against your chest as possible
C. in a kneeling position
D. extended straight down and crossed at the ankles
[单项选择]Which kind of fog is also named as ground fog?（）
A. Advection
B. Radiation fog
C. frontal fog
D. Steam fog
[单项选择]Radiation fog（）.
A. always forms over water
B. is formed by a temperature inversion
C. is thinnest at the surface
D. dissipates during the evening
[单项选择]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
[单项选择]Fog forms when the air（）.
A. Is 50% water saturated
B. Is 90% water saturated
C. Temperature is greater than the dew point temperature
D. Temperature is equal to，or below the dew point temperature
[单项选择]Which instrument is most useful in forecasting fog（）.
A. A barometer
B. An anemometer
C. A sling psychrometer
D. A pyrometer
[单项选择]Advection fog holds longest over which portions of the lakes?（）
A. Northwest
B. Southeast
C. Northeast
D. Southwest
