Which of the following is a Class D fire?
a. Cloth and paper.
b. Lubricating oils.
c. Magnesium.
d. Live electrical wire.
e. Ordinary combustibles.
Answer: C
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3rd Class A2 Chapter 15
- Emergency preparedness means having plans in place in the event of an emergency.
- Foam-Water Sprinkler Systems is used in areas where flammable and combustible liquids are processed, stored, or handled; a water discharge may be ineffective for controlling or extinguishing fires.
- In most cases, it is desired a water spray be used to extinguish burning gases, such as LPG (Liquefied Petroleum Gas).
- Fixed water spray systems are most commonly used to protect equipment from exposure fires in flammable liquid and gas tankage, piping, and equipment.
- Hydrant spacing is usually determined by the fire flow demand established on the basis of the type, size, occupancy, and exposure of structures.
- Standpipes for risers of less than 30 m are usually NPS 102 mm pipe, over 30 m, the pipe is usually NPS 152 mm. Where a building has a high level fire zone; that is, floors more than 85 m above street level, then the riser to these higher floors is usually NPS 203 mm. Standpipes for risers of less than 30 m are usually NPS 102 mm pipe, over 30 m, the pipe is usually NPS 152 mm. Where a building has a high level fire zone; that is, floors more than 85 m above street level, then the riser to these higher floors is usually NPS 203 mm.
- Fire detection provisions are not needed so that automatic or manual fire suppression can be initiated.
- The first dry chemical fire-extinguishing agent to be formulated was based on sodium bicarbonate.
- Central Foam Distributing Systems consist of an enclosure housing a foam concentrate supply tank and a _____ device.
- The best method of thawing a hydrant is by means of a:
- _____ is often the first indicator of fire, so a system of automatic detectors should be used.
- There is always a risk of an emergency, no matter how complete the:
- In large industrial settings, workers on shift will be trained in specific _____ to follow in the event of an emergency, including fire.
- Foam systems are used where flammable liquid fire protection is required for permanently installed hazards, such as fuel storage tanks or dip tanks containing flammable or combustible liquids, _____ and distributing devices are installed internally in the tank.
- Fire protection of large outdoor fuel tanks requires that several foam chambers with foam-makers be installed at equally spaced positions slightly below the _____ of the tanks.
- Fixed _____ sprays are designed specifically to provide optimum control, extinguishment, or exposure protection for special fire protection problems.
- The fixed water spray piping system is connected to a water supply through a _____ valve that can be actuated both automatically and manually to initiate the flow of water.
- Ways to detect freezing in a hydrant include:
- Sprinkler systems consist of a pressure or gravity tank to maintain the correct water pressure, control valves for each section, and lengths of piping fitted with:
- A safe rule to follow is to bury the top of the pipe not less than _____ below the lowest frost line for the locality.
- For average conditions, hydrants normally are placed about _____ from buildings.
- There are two types of fire hydrants in general use today.
- The main elements of a fire protection system for an industrial site include.
- Standpipe systems are used in buildings over _____ in height, since that is the practical limit for firefighters to couple hose together from the pump truck at street level up the stairways to the fire floor.
- As it is heated, a _____ deforms in the direction of the contact point.