Chapter 16 prequiz

Smooth bore nozzles will require additional personnel for safe handling at nozzle pressures greater than: Select one: a. 65 psi (450 kPa). b. 50 psi (350 kPa). c. 100 psi (700 kPa). d. 75 psi (525 kPa).

a. 65 psi (450 kPa)

Which of the following statements about compressed air foam systems (CAFS) is MOST accurate? Select one: a. An onboard air compressor adds air to the foam solution. b. There is little to no nozzle reaction when using CAFS. c. Hoselines filled with CAFS are heavier than those filled with water only. d. Stream reach is shorter than with other foam systems.

a. An onboard air compressor adds air to the foam solution.

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

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

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)? Select one: a. Handline stream b. Low-volume stream c. High-volume stream d. Master stream

a. Handline stream

Which foams are effective extinguishing agents and vapor suppressants because they float on the surface of hydrocarbon fuels? Select one: a. Protein and fluoroprotein foams b. Aqueous film forming foams c. High-expansion foams d. Alcohol-resistant foams;

a. Protein and fluoroprotein foams

Which of the following is the BEST way to prevent water hammer? Select one: a. Bleed air from hoselines. b. Use ball valve controls. c. Flush debris from nozzles before use. a. Protein and fluoroprotein foams

a. Protein and fluoroprotein foams

Which of the following statements about inspecting nozzles is MOST accurate? Select one: a. Technical maintenance should be performed by qualified technicians. b. Worn gaskets should be noted and replaced during weekly maintenance. c. The pistol grip should be removed for storage. d. Inspections should be performed every two years.

a. Technical maintenance should be performed by qualified technicians.

Which of the following statements about fire streams is MOST accurate? Select one: a. Water broken into small droplets absorbs heat more rapidly. b. A broken-stream has a smaller surface area. c. A solid stream has greater surface area to absorb heat. d. Water in a solid stream absorbs heat more rapidly.

a. Water broken into small droplets absorbs heat more rapidly.

Friction loss may be overcome by: Select one: a. adding additional parallel hoselines. b. curving the hoseline. Incorrect c. decreasing hose size. d. inserting in-line gauges in the layout.

a. adding additional parallel hoselines.

The most common type of foam proportioner in use is the: Select one: a. in-line foam educator. b. compressed air foam system. c. around-the-pump proportioner. d. foam nozzle eductor.

a. in-line foam educator.

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

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

Which type of nozzle can be adjusted, resulting in different patterns? Select one: a. Bresnan b. Fog c. Stacked tip d. Smooth bore

b. Fog

Which type of nozzle can be used to effectively control fires in concealed spaces? Select one: a. Adjustable fog b. Piercing c. Smooth bore d. Stacked tip

b. Piercing

Which of the following fire stream patterns has the ability to reach areas other streams might not reach? Select one: a. Straight stream b. Solid stream c. Broken-stream d. Fog-stream

b. Solid stream

The type of nozzle control valve that seats a moveable cylinder against a shaped cone to turn off the flow of water is the: Select one: a. standpipe valve. b. slide valve. c. rotary control valve. d. ball valve.

b. slide valve.

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? Select one: a. Rain-down method b. Roll-on method c. Bank-down method d. Venturi method

c. Bank-down method

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

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

d. to minimize turbulence in the fire stream. Which nozzles pump foam solution through the nozzle in a fine spray that mixes with air to form foam? Select one: a. Constant-pressure fog nozzles b. Air-aspirating nozzles Incorrect c. Water-aspirating nozzles d. Basic fog nozzles

c. Water-aspirating nozzles

The energy required to change a liquid into a vapor is: Select one: a. steam heat. b. specific heat. c. latent heat of vaporization. d. British thermal unit (Joule).

c. latent heat of vaporization.

Poor-quality foam may result from: Select one: 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. Feedback

c. mixing different types of foam concentrates in the same tank.

When operating a handline, a firefighter should open the control valve slowly: Select one: a. to comply with manufacturer's recommendations. b. to increase water hammer. c. to better control nozzle reaction.

c. to better control nozzle reaction.

Which of the following types of nozzle control valves provides effective control with minimum effort? Select one: a. Rotary control valve b. Slide valve c. Standpipe valve d. Ball valve

d. Ball valve

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

d. Eduction uses pressure energy in the stream of water to induct foam concentrate into the fire stream

Which of the following statements about fog-streams is MOST accurate? Select one: a. Fog-streams have longer reach than straight streams. b. Fog-streams are more likely to conduct electricity than solid streams. c. Fog-streams are less affected by wind than are solid streams. d. Fog-streams may be used to cool the hot fire gas layer.

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

A decrease in water pressure at the nozzle might be caused by: Select one: a. decreasing the number of adapters. b. placing the nozzle below the fire pump. c. decreasing the length of the hose lay. d. adding bends to the hose lay.

d. adding bends to the hose lay.