Firefighting foam is only effective when the foam_____.

相似题目

• Your vessel is listening 4°to port and has a short rolling period. There is loose firefighting water in the hull. The ship is trimmed down by th end with one foot of freeboard at the bow. Which action should you take first?（）

  A . Press up the slack No.1 starboard double bottom tank B . Pump out the forepeak tank C . Eliminate the water in the tween decks aft D . Jettision stores out of the paint locker in the focsle

  查看最佳答案

• Foaming of the oil in a refrigeration compressor crankcase is caused by （）.

  A . refrigerant boiling out of solution from the lube oil B . liquid refrigerant flooding the compressor and system C . lube oil viscosity being reduced by refrigerant dilution D . compressor suction pressure suddenly increasing

  查看最佳答案

• A ship helicopter landing deck on which fueling operations are conducted must have a fire protection system that is capable of discharging at 100 psi pressure a foam spray of at least（）.

  A . 30 gallons per minute B . 40 gallons per minute C . 50 gallons per minute D . 60 gallons per minute

  查看最佳答案

• What is an advantage of using foam in fire fighting?（）

  A . It is effective in controlling fire in flowing oil such as coming from a broken fuel line B . It absorbs heat from materials that could cause reignition C . Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment D . Once the surface is blanketed with foam and the fire is extinguished，no further foam is required

  查看最佳答案

• Firefighting foam is only effective when the foam（）.

  A . penetrates to the bottom of the fire B . is kept saturated with low-velocity water fog C . mixes with the burning fuel oil D . completely covers the top of the burning liquid

  查看最佳答案

• Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.

  A . 97 times greater B . 94 times greater C . 10 times greater D . 2 times greater

  查看最佳答案

• 0ne of the limitations of foam as an extinguishing agent is that foam（）.

  A . cannot be made with salt water B . is heavierthan oil and sinks below its surface C . is corrosive and to fire fighters D . conducts electricity

  查看最佳答案

• Which of the following statements regarding low expansion foam and its application is INCORRECT?（）.

  A . Foam should not be used on electrical fires B . One kilo of low expansion foam solution produces much more foam C . Foam is only efficient when it covers the top of burning combustibles D . A stream of foam should be deflected off the deck in order to best agitate the fire

  查看最佳答案

• One of the limitations of foam as an extinguishing agent is that foam（）.

  A . cannot be made with salt water B . is heavier than oil and sinks below its surface C . is corrosive and a hazard to fire fighters D . conducts electricity

  查看最佳答案

• There are two disadvantages to CO2 pump as a firefighting agent. One of these is the limited quantity available，and the other is（）.

  A . the lack of cooling effect on heated materials B . that it cannot be used in a dead ship situation with no electrical power to the CO pump C . that it breaks down under extreme heat to form poisonous gases D . there is no effect on a class A fire even in an enclosed space

  查看最佳答案

• 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

  查看最佳答案

• A portable foam fire extinguisher is placed in operation by（）

  A . turning it upside down B . pressing the foam lever C . squeezing the grip handle D . opening the hose valve

  查看最佳答案

• Each crewmember has an assigned firefighting station. This assignment is shown on the（）.

  A . fire fighting plan B . shipping articles C . Certificate of Inspection D . muster list

  查看最佳答案

• Foam is a very effective smothering agent and（）.

  A . it provides cooling as a secondary effect B . works well on extinguishing electrical fires C . can be used to combat combustible metal fires D . All of the above

  查看最佳答案

• A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

  A . generators B . oil drums C . the bridge controls D . combustible metal

  查看最佳答案

• If heavy smoke is coming from the paint locker,the first firefighting response should be to（）.

  A . release the CO fiooding system B . open the door to evaluate of the fire C . enter and use a portable extinguisher D . secure the ventilatio

  查看最佳答案

• Which statement about firefighting foam is TRUE?（）

  A . Foam conducts electricity B . To be most effective，foam should be directed at the base of the fire C . Foam is most effective on burning liquids which are flowing D . Foam can ONLY be used to extinguish class A fire

  查看最佳答案

• A condition that can increase the foaming tendency of lube oil is （）

  A . excessively high oil temperatures B . water or moisture contamination C . fuel dilution D . life its cylinder relief vale

  查看最佳答案

• Containerization is only suitable for ocean carriage.

  查看最佳答案

• Identify Which sentences use the rhetorical device of antithesis.2. There is only one good, that is knowledge; there is only one evil, that is ignorance.

  查看最佳答案

• 129．One of the limitations of foam as an extinguishing agent is that foam ______.

  查看最佳答案

• The fence is only partially successful.

  A．YES B．NO C．NOT GIVEN

  查看最佳答案

• If heavy smoke is coming from the paint locker, the FIRST firefighting response should be to ______.

  A.release the CO2 flooding system B.open the door to evaluate the extent of the fire C.enter and use a portable extinguisher D.secure the ventilation

  查看最佳答案