Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire？

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• Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?（）

  A . Commence draining that tank as quickly as possible B . Seal off all vents to that tank C . Activate the CO system to that tank D . Shut off the steam heating coil

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• Which of the listed effects represents the purpose of heat treating steel?（）

  A . Develop ductility B . Improve machining qualities C . Relieves stresses D . All of the above

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• 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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• Which of the listed statements is correct concerning refrigeration systems?（）

  A . Dehydrators must be used continuously in a refrigeration system B . A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours C . A thermostatic expansion valve is used to control refrigerated space temperature D . The liquid receiver functions to collect and remove non- condensable gase

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• Which of the listed classes of fire would most likely occur in the engine room of a vessel?（）

  A . Classes A and B B . Classes B and C C . Classes C and D D . Classes A and D

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• Which of the following represents the emergency signal for fire aboard ship?（）

  A . More than six short blasts and one long blast on the whistle B . Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm C . Three short blasts of the whistle supplemented by the same signal on the general alarm D . More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm

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• Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?（）

  A . Dry chemical B . Foam C . Water D . Carbon dioxide

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• Which of the listed classes of fire is considered as one involving electrical equipment?（）

  A . Class "A" B . Class "B" C . Class "C" D . Class "D&quot

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• Which of the listed materials would be considered as a bunting class "C" fire?（）

  A . Fuel oil B . Wood C . Celluloid D . Electrical insulatio

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• Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

  A . Overcoming sliding friction B . Overcoming rolling friction C . Overcoming fluid friction D . Overcoming oil wedge frictio

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• Which of the petroleum products listed has the lowest flash point?（）

  A . Hydraulic oil B . Lubricating oil C . Diesel oil D . Refrigeration oil

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• Which of the following are characteristics of named access lists?（）

  A . Individual statements in a named access list may be deleted. B . They require a numbered range from 1000 to 1099. C . When created, they must be specified as standard or extended. D . They are created with the ip access-list command. E . The entire access list must be deleted before editing. F . They are applied with the ip name-group command.

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• Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）

  A . Improper fuel rack positioning B . Lengthy opening of the exhaust valve C . Excessively early injection timing D . Extended light load operatio

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• Which of the fire extinguishers listed is to be weighed annually and sent ashore for recharging if the weight loss exceeds 10% of the weight of a full charge?（）

  A . Foam B . Soda acid C . Dry chemical D . Carbon dioxide

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• Which of the listed statements is correct concerning the starting of centrifugal pumps?（）

  A . They should always be started with the discharge valve closed B . They should always be started with the discharge valve opened C . A priming pump is always required to flood the impeller suction D . They should always be started with the sealing line valves closed

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• Which of the listed burning materials would be described as a class "B" fire?（）

  A . Acetylene B . Lube oil C . Grease D . All of the above

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• In which of the listed refrigeration system components does superheating of the refrigerant take place?（）

  A . Expansion valve B . Evaporator C . Drier D . Receiver

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• Which of the following components provides a direct source of seawater for the fire main system?（）

  A . Rose box B . Sea chest or spool piece C . Sluice valve D . Fire pump stuffing box

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• Which of the listed fire extinguishers cannot be easily recharged aboard ship?（）

  A . Soda acid B . Carbon dioxide C . Dry chemical D . Cartridge-operated Foam

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• For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.

  A . Class "A" and class "B" B . Class "B" and class "C" C . Class "A" and class " C" D . Class "C", class "D", and class "E&quot

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• A fire may be spread by which of the following means?（）

  A . Conduction of heat to adjacent surfaces B . Direct radiation C . Convection D . All of the above

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• If ignited, which of the listed materials would be a class "B" fire?（）

  A . Magnesium B . Paper C . Wood D . Diesel Oil

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• Which of the devices listed is common to all types of pumps?（）

  A . A power end and fluid end B . A propeller and educator C . A volute and impeller D . A turbine and pisto

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• The class of fire on which a blanketing effect is essential to extinguish the fire is （）.

  A . class A B . class B C . class C D . class D

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