更多"Hydrocarbon vapors are usually dete"的相关试题:
[单项选择]Diesel fuel vapors （）.
A. can not be ignited by a spark unless the vapor is in a confined space
B. are nontoxic in all concentrations
C. can not be ignited by a spark unless they are at their auto-ignition temperature
D. are heavier than air
[单项选择]Which statement is TRUE concerning gasoline vapors on board a vessel（）.
A. They are heavier than air and will settle in the lowest part of the vessel
B. They are lighter than air and will settle in the highest part of the vessel
C. They should be vented into the engine to improve combustion
D. They should be vented into the wheelhouse
[单项选择]Which statement is TRUE concerning fuel vapors on a vessel（）.
A. Fuel vapors gather in the lowest portions of the vessel
B. Fuel vapors can only be ignited by an open flame
C. Vent outlets should be located above the level of the carburetor air intake
D. None of the above
[单项选择]Which may ignite fuel vapors?（）
A. Static electricity
B. An open and running motor
C. Loose wiring
D. All of the above
[单项选择]The weight of liquefied petroleum gas vapors as compared to air is（）.
A. variable
B. the same
C. lighter
D. heavier
[单项选择]Each hose used for transferring vapors must（）.
A. have a design burst pressure of at least 25 psig
B. be capable of withstanding at least 2.0 psi vacuum without collapsing or constricting
C. be electrically continuous with a maximum resistance of ten thousand ohms
D. All of the above
[单项选择]The vapors given off by heated fuel oil are heavier than air and are（）.
A. odorless
B. explosive
C. nontoxic
D. visible
[单项选择]The vapors given off by heated fuel oil are flammable, explosive, and （）
A. lighter than air
B. heavier than air
C. odorless
D. nontoxic
[单项选择]If the diesel fuel vapors present are within the flammable range （）.
A. the vapor air mixture is too rich to burn
B. an explosion may occur if a source of ignition is present
C. the vapor air mixture is too lean to bum the upper explosive
D. limit has been exceeded
[单项选择]Damage to cargo caused by fumes or vapors from liquids，gases，or solids is known as（）.
A. contamination
B. oxidation
C. tainting
D. vaporization
[单项选择]On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.
A. mimimum oxygen content line
B. critical displacement line
C. critical dilution line
D. upper threshold limit
[单项选择]Which signal is detected as originating from a SART?（）
A. The Morse code distress series S-O-S repeated 3 times followed by DE and the vessel's call sign
B. A line of blip code on a radar screen outward from the SART's position along its line of bearing
C. A line of blip code on a radar screen inward from the SART's position to its own ship along its line of bearing
D. None of these
[单项选择]Aburned exhaust valve may be detected by a higher than normal （）
A. firing pressure
B. exhaust temperature from a particular cylinder
C. cooling water temperature
D. compression pressure
[单项选择]The smallest size of flaw that can be detected on a radiograph examination of a weld will be indicated by the（）.
A. film speed
B. penetrometer
C. exposure reading
D. time of exposure
[单项选择]Once a fire is detected the engine should be slowed downOn no account （）.
A. the trunking should be opened up
B. should the trunking be opened up
C. the trunking should not be opened up
D. should the trunking not be opened up
[单项选择]A dirty fuel oil filter element can be detected by （）
A. Visual inspection of the element
B. the pressure drop cross the filter
C. high fuel oil tank temperature
D. increase flow rate from the filter
[单项选择]Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubrication increased （） the risk of seizure.
A. to protect
B. to guard
C. to maximize
D. to minimize
[单项选择]Once a scavenge fire is detected the engine （）.
A. will be speeded up
B. should be slowed down
C. must slow down
D. have to be slow down
