Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Safety & Environmental Protection (Deck) (Set 25)

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Question 1 of 30

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Question 1 of 30

You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________.

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30 MCQs

#1 You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________. #2 As compared to carbon dioxide, dry chemical has which advantage? #3 Which statement describes the primary process by which fires are extinguished by dry chemical? #4 An advantage of an ABC dry chemical over a carbon dioxide extinguisher is __________. #5 When electrical equipment is involved in a fire, the stream of dry chemicals should be __________. #6 You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________. #7 An advantage of a dry chemical over a carbon dioxide fire extinguisher is its __________. #8 One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that __________. #9 Dry chemical extinguishers may be used on what class of fires? #10 Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by __________. #11 A portable dry chemical fire extinguisher discharges by __________. #12 A stored-pressure water extinguisher is most effective against fires of class __________. #13 Which extinguishing agent is most effective on a mattress fire? #14 Which type of portable fire extinguishers is NOT designed for use on flammable liquid fires? #15 The extinguishing agent most effective for combating wood fires is __________. #16 Which type of portable fire extinguishers is NOT designed for use on flammable liquid fires? #17 The most effective fire extinguishing agent to use on burning linen is __________. #18 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 __________. #19 The primary method by which water spray puts out fires is by __________. #20 A definite advantage of using water as a fire extinguishing agent is its characteristic of __________. #21 Which extinguishing agent will absorb the most heat? #22 The most effective cooling agent among those normally used to fight fires is __________. #23 An extinguishing agent which effectively cools, dilutes combustible vapors, removes oxygen, and provides a heat and smoke screen is __________. #24 Which extinguishing agent will cool down a heated bulkhead in the least amount of time? #25 Which fire-fighting agent is most effective at removing heat? #26 What are the most important reasons for using water fog to fight fires? #27 When using a high-velocity fog stream in a passageway, the possibility of a blow back must be guarded against. Blow back is most likely to occur when __________. #28 What is an advantage of water fog or water spray over a straight stream of water in fighting an oil fire? #29 Water fog from an all-purpose nozzle may be used to __________. #30 What is the BEST conductor of electricity?

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