FF2 IFSTA 6th edition Chapter 16 quiz

Which technique for applying Class B foam is used primarily on fires contained in diked pools around storage tanks and fires involving spills around damaged or overturned transport vehicles? A) Bank-down method B) Roll-on method C) Venturi method D) Rain-down method

A) Bank-down method

Which of the following statements about foam hazards is MOST accurate? A) Manufacturers' safety data sheets provide environmental impact information for specific foam concentrates. B) Generally, protein-based foams present a greater hazard to the environment. C) The decomposition process results in the release of oxygen. D) Environmentally friendly foams require more oxygen to degrade in water.

A) Manufacturers' safety data sheets provide environmental impact information for specific foam concentrates.

Which of the following statements about foam concentrates is MOST accurate? A) Foam blankets are ineffective at suppressing vapors from unignited fuels. B) Class B foams are effective on hydrocarbon fuels and polar solvents. C) Class A foams are not appropriate for wildland fire fighting. D) Class A and Class B foams are also effective for use on unignited spills of hazardous liquids.

B) Class B foams are effective on hydrocarbon fuels and polar solvents.

Which of the following statements about fog-streams is MOST accurate? A) Fog-streams have longer reach than straight streams. B) Fog-streams may be used to cool the hot fire gas layer. C) Fog-streams are more likely to conduct electricity than solid streams. D) Fog-streams are less affected by wind than are solid streams.

B) Fog-streams may be used to cool the hot fire gas layer.

Friction loss may be overcome by: A) decreasing hose size. B) adding additional parallel hoselines. C) inserting in-line gauges in the layout. D) curving the hoseline.

B) adding additional parallel hoselines.

Which type of nozzle can be adjusted, resulting in different patterns? A) Bresnan B) Fog C) Smooth bore D) Stacked tip

B) fog

Which of the following statements about foam proportioning is MOST accurate? A) Injection depends on the Venturi Principle to draw foam into the fire stream. B) Premix systems can be used for several applications before they must be filled again. C) Eduction uses pressure energy in the stream of water to induct foam concentrate into the fire stream. D) Batch-mixing is rarely used for Class A foam concentrates.

C) Eduction uses pressure energy in the stream of water to induct foam concentrate into the fire stream

Which of the following statements about fire fighting foam is MOST accurate? A) Foam works by increasing the surface tension of water, making fire streams more cohesive to reach a greater distance. B) Foam expands at nearly a 10-to-1 ratio of foam solution to air. C) Foam works by forming a blanket of foam on the surface of burning fuels. D) Air is added to the foam solution through a chemical reaction between foam concentrate and oxygen in the atmosphere.

C) Foam works by forming a blanket of foam on the surface of burning fuels.

Which of the following fire stream patterns has the ability to reach areas other streams might not reach? A) Broken-stream B) Fog-stream C) Solid stream D) Straight stream

C) Solid stream

Which of the following statements about fire streams is MOST accurate? A) Water in a solid stream absorbs heat more rapidly. B) A broken-stream has a smaller surface area. C) Water broken into small droplets absorbs heat more rapidly. D) A solid stream has greater surface area to absorb heat.

C) Water broken into small droplets absorbs heat more rapidly.

The most common type of foam proportioner in use is the: A) foam nozzle eductor. B) compressed air foam system. C) in-line foam eductor. D) around-the-pump proportioner.

C) in-line foam eductor.

The type of nozzle control valve that seats a moveable cylinder against a shaped cone to turn off the flow of water is the: A) standpipe valve B) ball valve C) slide valve D) rotary control valve

C) slide valve

Foam concentrates generate bubbles through chemical reaction when concentrates are mixed with water. True False

False

Nozzles should be stored with the control valve bale in the open position. True False

False

The primary way water extinguishes fire is by excluding oxygen from the fuel (smothering). True False

False

Rotary control valves control both the water flow and the discharge pattern of a fire stream. True False

True

To prevent water hammer, valves, nozzles, and hydrants should be closed slowly. True False

True

When applying foam to a pool of liquid fuel, the operator continues to apply foam until it spreads across the entire surface of the fuel. True False

True

Poor-quality foam may result from: A) excessive pressure in the supply line. B) the nozzle being placed too far below the eductor. C) mixing different types of foam concentrates in the same tank. D) the hose lay on the discharge side of the eductor being too short.

pending

The energy required to change a liquid into a vapor is: A) British thermal unit (Joule). B) specific heat. C) latent heat of vaporization. D) steam heat.

pending

When operating a handline, a firefighter should open the control valve slowly: A) to increase water hammer. B) to better control nozzle reaction. C) to minimize turbulence in the fire stream. D) to comply with manufacturer's recommendations.

pending

Which nozzles pump foam solution through the nozzle in a fine spray that mixes with air to form foam? A) Constant-pressure fog nozzles B) Basic fog nozzles C) Air-aspirating nozzles D) Water-aspirating nozzles

pending

Which of the following fire streams is supplied by 1½- to 3-inch (38 mm to 77 mm) hose, and discharges from 40 to 350 gpm (160 L/min to 1 400 L/min)? A) Master stream B) Handline stream C) Low-volume stream D) High-volume stream

pending

Which type of nozzle can be used to effectively control fires in concealed spaces? A) Smooth bore B) Piercing C) Adjustable fog D) Stacked tip

pending

Alcohol-resistant foams are specially developed for polar solvents and ethanol-based fuels. A) true B) false

true

Foam concentrates pose minimal health risks to firefighters A) true B) false

true

For maximum effectiveness, foam concentrates must be proportioned at the specific percentage for which they were designed. True False

true