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Engineer > Chapter 14 > Flashcards

Chapter 14 Flashcards

1
Q

Which of the following factors is MOST likely to affect the degree of expansion in a foam solution:?

a. Decomposition rate
b. Method of aeration
c. Biodegradability
d. Rate of application

A

b. Method of aeration

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2
Q

In which of the following situations is it acceptable to mix together different manufacturers’ foam concentrates?

a. If they are Class B polar solvent foams
b. If they are Class A CAFS foams
c. If they are mil-spec concentrates
d. If they are not mil-spec concentrates

A

c. If they are mil-spec concentrates

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3
Q

Installed in-line eductors are most commonly used to proportion which class of foam?

a. Class B
b. Class C
c. Class A
d. Class K

A

a. Class B

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4
Q

Class B synthetic foam concentrate is made from:

a. a mixture of fluorosurfactants.
b. animal proteins.
c. a mixture of gelling agents.
d. film forming fluoroprotein.

A

a. a mixture of fluorosurfactants.

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5
Q

Batch mixing is generally only used with which types of foam concentrates?

a. Class A and alcohol resistant AFFF concentrates
b. Class A and regular AFFF concentrates
c. Class B and alcohol resistant AFFF concentrates
d. Class B and regular AFFF concentrates

A

b. Class A and regular AFFF concentrates

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6
Q

Class A foam solutions do not retain their foaming properties when mixed in water for more than:

a. one month.
b. 24 hours.
c. one week.
d. 2 hours.

A

b. 24 hours.

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7
Q

A smooth bore nozzle is limited to application of which classification of foam?

a. Class B foam from a CAFS
b. Class A foam from a CAFS
c. Any Class B foam
d. Any Class A foam

A

b. Class A foam from a CAFS

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8
Q

Which of the following statements about variable-flow demand-type balanced pressure proportioners is
MOST accurate?

a. It consists of a variable speed mechanism driven electrically or hydraulically that operates a foam concentrate pump.
b. It is a method compatible only with high energy foam systems.
c. It is the simplest method of proportioning foam.
d. It features the ability to monitor the demand for foam concentrate and adjust the amount of concentrate supplied.

A

a. It consists of a variable speed mechanism driven electrically or hydraulically that operates a foam concentrate pump.

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9
Q

Because it forms a rigid coating that adheres well and is slow to drain, the best consistency of Class A foam for vertical surfaces is:

a. medium foam.
b. hard foam.
c. wet foam.
d. dry foam.

A

d. dry foam.

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10
Q

Driver/operators calculate the
application rate available from a specific nozzle by:

a. dividing the area of the fire by the flow rate.
b. multiplying the flow rate by the area of the fire.
c. multiplying nozzle pressure by the area of the fire.
d. dividing the flow rate by the area of the fire.

A

d. dividing the flow rate by the area of the fire.

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11
Q

Which of the following is released as a fire fighting foam breaks down, providing a cooling effect on the fuel and suppressing the process of heat-producing oxidation?

a. Proteins
b. Gel
c. Polar solvents
d. Water

A

d. Water

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12
Q

In which of the following ways are durable agents similar to Class A foam?

a. Both products are inexpensive and easily stored.
b. Both products are used in a similar fashion.
c. Both products form small bubbles filled with water.
d. Both products are water absorbent polymers.

A

b. Both products are used in a similar fashion.

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13
Q

Which of the following is a disadvantage of durable agents?
a. These products can only be batch mixed and may result in discarding expensive product.
b. Once applied, surfaces coated with these products become very slippery for walking or driving.
c. These products do not retain their fire retarding properties as long as Class A foam.
d. The products are not biodegradable and can be toxic to the environment.

A

b. Once applied, surfaces coated with these products become very slippery for walking or driving.

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14
Q

High-energy foam generating systems/CAFS differ from other methods because:

a. the flow of concentrate matches the pressure demand better.
b. they introduce compressed air into the foam solution prior to discharge into the hoseline.
c. they introduce compressed air into the foam solution after discharge into the hoseline.
d. the concentrate is supplied from atmospheric pressure foam tanks on the apparatus.

A

b. they introduce compressed air into the foam solution prior to discharge into the hoseline.

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15
Q

Which of the following examples of polar solvent fuels requiring the use of special polymeric fire fighting foam?

a. Alcohol and ketones
b. Esters and cooking oils
c. Kerosene and crude oils
d. Water and acetone

A

a. Alcohol and ketones

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16
Q

Direct application is a method of attack that is BEST used with:

a. aqueous film forming foam
b. Class B foam
c. Class A foam
d. Film forming fluoroprotein foam

A

c. Class A foam

17
Q

The process of foam decomposition results in the consumption of:

a. Fresh water
b. Oxygen
c. Aquatic life.
d. Carbon dioxide

A

b. Oxygen

18
Q

Which kind of nozzle allows firefighters the option of operating fixed flow, selective flow, or automatic flow when applying a low expansion, short duration foam blanket?

a. Fog nozzles
b. Smooth bore nozzles
c. Air-aspirating foam nozzles
d. Master stream foam nozzles

A

a. Fog nozzles

19
Q

In some installed in-line eductor systems, a(an) _ proportioner is installed to reduce the friction loss across the eductor.

a. injection
b. expansion
c. around-the-pump
d. bypass

A

d. bypass

20
Q

Which of the following statements about regular protein foams is MOST accurate?

a. They are derived from animal protein and contain no additives or chemicals.
b. They degrade more quickly and are becoming increasingly rare.
c. They are a combination of protein-based foam and synthetic foam.
d. They are more fluid than most other low expansion foams.

A

b. They degrade more quickly and are becoming increasingly rare.

21
Q

Which of the following has a pickup tube that is located in the center bore of the nozzle and uses a modified Venturi design to draw concentrate into its water stream?

a. In-line foam eductors
b. Self-educting master stream foam nozzle
c. Foam nozzle eductors
d. Jet ratio controller

A

b. Self-educting master stream foam nozzle

22
Q

Which of the following is the most common apparatus-mounted foam proportioner and consists of a small return (bypass) water line connected from the discharge side of the pump back to the intake side of the pump?

a. Around-the-pump proportioner
b. Bypass-type balanced pressure proportioner
c. Variable-flow variable-rate direct injection proportioner
d. Variable-flow demand-type balanced pressure proportioner

A

a. Around-the-pump proportioner

23
Q

Which of the following is a proportioner used on large mobile apparatus installations, such as ARFF vehicles, and is one of the most accurate methods of foam proportioning?

a. Around-the-pump proportioner
b. Bypass-type balanced pressure proportioner
c. Variable-flow variable-rate direct injection proportioner
d. Variable-flow demand-type balanced pressure proportioner

A

b. Bypass-type balanced pressure proportioner

24
Q

Which of the following is a variable that affects a foam’s rate of application?

a. Environmental considerations
b. Whether the fuel is contained or uncontained
c. The type of foam proportioner used
d. The ambient temperature at the incident site

A

b. Whether the fuel is contained or uncontained

25
Q

Which of the following is determined by the rate at which natural bacteria can degrade foam?

a. Hydrolization
b. Biodegradability
c. Burnback resistance
d. Decomposition

A

b. Biodegradability

26
Q

When using the batch mixing proportioning method, frothing can be avoided by:

a. removing lubricants from pump seals.
b. draining and refilling the water tank.
c. slowly circulating water in the tank.
d. using a lower proportion of foam.

A

c. slowly circulating water in the tank.

27
Q

The act of mixing water with foam concentrate to form a foam solution is called:

a. education
b. hydrolization
c. Aeration
d. Proportioning

A

d. Proportioning

28
Q

Due to the low eduction rates on a CAFS apparatus, what is required to supply the fire stream at the rate of 0.1 to 1.0 percent?

a. Film forming fluoroprotein foam (FFFP)
b. A variable flow rate sensing proportioner
c. Gelling agents in the foam solution
d. A handline nozzle

A

b. A variable flow rate sensing proportioner

29
Q

Which of the following is a limitation of CAFS?

a. In the event of a hose burst, compressed air will intensify the reaction of the hoseline.
b. CAFS requires closer proximity to the
fire.
c. Foam produced by a CAFS does not adhere to a fuel surface as well as low energy foam.
d. Hoselines containing high energy foam solution weigh more than those containing plain water.

A

a. In the event of a hose burst, compressed air will intensify the reaction of the hoseline.

Engineer (17 decks)

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