To extinguish an electrical fire, you ...

单项选择题To extinguish an electrical fire, you should use （）.

A.mechanical foam
B.chemical foam
C.carbon dioxide
D.soda acid

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1.单项选择题If a CO₂ fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）

A.Dry chemical
B.Halon
C.Low velocity fog
D.Steam

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2.单项选择题You hear the general alarm bells and ships whistle sound for over 10 secondsTraditionally, this is the signal for （）.

A.abandon ship
B.dismissal from drills
C.fire and emergency
D.lower lifeboats

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3.单项选择题The abandon ship signal sounded by the vessels whistle is （）.

A.6 short blasts and 1 long blast
B.long blast mare than 6 short blasts
C.more than 6 short blasts and 1 long blast
D.1 long blast of at least 10 seconds

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4.单项选择题If you have to abandon ship and enter a life-raft, your main course of action should be （）.

A.remain in the vicinity of the vessel
B.head for the closest land
C.head for the closest sea-lanes
D.get a majority opinion

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5.单项选择题In the first 24 hours after abandoning a vessel, water should be given only to personnel who are（）.

A.thirsty
B.sick or injured
C.wet
D.awake

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6.单项选择题Diesel fuel is relatively safe to handle due to its low volatility, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the （）.

A.flash point
B.auto-ignition point
C.volatility point
D.upper explosive limit

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7.单项选择题If the buoyant force on a ships hull is equal to or greater than the displacement tonnage, the ship will （）.

A.require ballast added to only the port side tanks
B.be down by the head
C.sink
D.float

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8.单项选择题When fighting an electrical fire, you should first （）.

A.stop ventilation to the area
B.stop the vessel
C.secure electricity to the circuit
D.apply CO₂to the fire

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9.单项选择题You are transferring fuel from the storage tanks to the day tanks by means of an electric fuel oil transfer pumpIf the pump motor catches fire, you would FIRST （）.

A.secure the fuel manifold
B.shut off power to the pump
C.shut off the power ventilation
D.spray water on the fire

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10.单项选择题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

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