An ABC dry chemical fire extinguisher would be least effective against a fire in（）.

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• To extinguish an electrical fire, you should use （）.

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

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• Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）

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

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• On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.

  A . acrylic acid B . benzene C . oleum D . vinyl toluene

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• Dry chemical fire extinguishers are effective on which type(s) of fire?（）

  A . Burning oil B . Electrical C . Paint D . All of the above

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• An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）.

  A . greater range B . effectiveness on all types of fires C . cleanliness D . All of the above

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• In cleaning up an oil spill, the use of chemical agents would （）.

  A . absorb the oil for easy removal B . remove the oil from the water C . disperse or dissolve the oil in the water D . not affect the oil

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• How does foam extinguish an oil fire?（）

  A . By cooling the oil below the ignition temperature B . By removing the fuel source from the fire C . By excluding the oxygen from the fire D . By increasing the weight of the oil

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• When must a dry chemical fire extinguisher be recharged?（）

  A . After each use B . When the air temperature exceeds 90°F C . Every 6 months D . Every 12 month

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• Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）

  A . Test the pressure gauge for correct reading B . Weigh the cartridge C . Replace the dry chemical D . Pressure test the discharge hose

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• An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.

  A . lack of toxicity B . the multipurpose extinguishing ability C . burn-back protection D . cooling ability

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• If a leak occurred while loading diethylenetriamine，the chemical data guide indicates you would smell an odor similar to（）.

  A . ammonia B . rotten eggs C . gasoline D . None of the above

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• Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.

  A . cooling B . smothering C . oxygen dilution D . breaking the chain reactio

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• （），as the chemical extinguisher agent，should be used for an electric fire.

  A . dry chemical or foam B . foam or soda acid C . carbon dioxide or foam D . carbon dioxide or dry chemical

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• Which firefighting method is an example of an indirect attack on a fire?（）.

  A . Bouncing a straight stream of water off the overhead to create spray effect B . Spraying foam on a bulkhead and letting it flow down and over a pool of burning oil C . Flooding a paint locker with CO and sealing the compartment D . Cooling adjacent bulkheads with water to prevent the spread of the fire by conductio

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• The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）

  A . soap hardness B . nitrog encontent C . chloride content D . dissolved CO

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• An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.

  A . greater range B . effective on all types of fires C . cleanliness D . All of the above

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• Flame failure in an automatically fired auxiliary boiler can from a/an （）

  A . incorrect electrode setting B . incorrect nozzle position C . clogged fuel nozzle D . broken high tension lead

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• As compared to carbon dioxide,dry chemical has which advantage?（）.

  A . Cleaner B . Effective C . Greater range D . More cooling effect

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• An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.

  A . a mattress B . spilled liquids such as oil or paint C . high voltage electrical gear D . a trash ca

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• Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）

  A . Alcohol foam B . Dry chemical C . Chemical foam D . Water fog

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

  A.CO2 B.ABC dry chemical C.CO2 propelled foam D.All of the above

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• In cleaning up an oil spill, the use of chemical agents would______.

  A.absorb the oil for easy removal B.remove the oil from the water C.disperse or dissolve the oil in the water D.not affect the oil

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• The equation shows that the slope of a plot of chemical potential against pressure is equal to the molar volume of the substance. An increase in pressure raises the chemical potential of any pure subs

  A．To raise the melting temperature slightly． B．To lower the melting temperature slightly． C．Negligibl E．No effect at all． D．None the above

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