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ff 1 > ch 7 test quiz > Flashcards

ch 7 test quiz Flashcards

1
Q

What is an advantage of portable fire extinguishers over hose lines?

A

faster deployment

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2
Q

What is the most commonly used extinguishing agent for Class A fires?

A

Water

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3
Q

The traditional symbol for a Class D fire extinguisher is a(n):

A

yellow star

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4
Q

What does it mean when a fire extinguisher has a pictograph with a red slash through it?

A

Use on that class of fire could be unsafe

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5
Q

Which is a primary factor when determining hazard classification for extinguisher selection and placement?

A

Amount of combustibles present

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6
Q

For the purpose of extinguisher selection and placement, a woodworking shop is a(n) __________ hazard environment.

A

extra

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7
Q

Which is one of the three basic components required for fire?

A

Oxygen

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8
Q

For an extinguishing agent to be approved for use on energized electrical equipment, it must:

A

not conduct electricity.

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9
Q

Which is a common dry chemical extinguishing agent?

A

potassium chloride

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10
Q

What is the term for a water-soluble flammable liquid?

A

Polar solvent

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11
Q

All portable fire extinguishers use which means for expelling their contents?

A

Pressure

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12
Q

What residue does a CO2 fire extinguisher leave when discharged?

A

None

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13
Q

What is the difference between dry powder and dry chemical extinguishing agents?

A

Each is rated for a different class of fire.

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14
Q

Which extinguishing agent is approved for use in a Class K system?

A

Wet chemical

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15
Q

A portable fire extinguisher is bested suited for which situation?

A

Fire in a wastebasket

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16
Q

class of fire image

burning trash can, and burning wood

A

class A

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17
Q

class of fire image

burning outlet

A

class C

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18
Q

class of fire image

burning gas can

A

class B

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19
Q

class of fire image

burning gear

A

class D

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20
Q

class of fire image

burning pan

A

class K

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21
Q

If a private residence has a single fire extinguisher, where should it be located?

A

Kitchen

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22
Q

Which is the most appropriate use for a portable fire extinguisher?

A

Situations in which the use of water is not recommended

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23
Q

What is an advantage of portable fire extinguishers over hose lines?

A

Faster deployment

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24
Q

Which class of fire includes cloth?

A

A

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25
Q

What is the most commonly used extinguishing agent for Class A fires?

A

Water

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26
Q

Which class of fire involves energized electrical equipment?

A

C

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27
Q

Which extinguishing agent is suitable for use on a Class C fire?

A

Carbon dioxide

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28
Q

Which class of fire extinguisher includes a number in its classification?

A

a

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29
Q

A Class C extinguisher is rated for use on:

A

energized electrical equipment.

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30
Q

What does it mean when a fire extinguisher has a pictograph with a red slash through it?

A

Use on that class of fire could be unsafe

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31
Q

Which is a primary factor when determining hazard classification for extinguisher selection and placement?

A

Amount of combustibles present

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32
Q

To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must:

A

be low combustibility.

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33
Q

For the purpose of extinguisher selection and placement, light hazard environments may contain a limited amount of combustibles of which class?

A

B

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34
Q

For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?

A

Classroom

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35
Q

For the purpose of extinguisher selection and placement, a woodworking shop is a(n) __________ hazard environment.

A

extra

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36
Q

Which is one of the three basic components required for fire?

A

Oxygen

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37
Q

Combustion begins when a fuel is heated to its:

A

ignition temperature.

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38
Q

For an extinguishing agent to be approved for use on energized electrical equipment, it must:

A

not conduct electricity.

39
Q

Dry chemical extinguishers may be used on Class C fires because they:

A

do not conduct electricity.

40
Q

Which is a common dry chemical extinguishing agent?

A

Potassium chloride

41
Q

What is the term for a water-soluble flammable liquid?

A

Polar solvent

42
Q

Which statement about the numerical rating of a Class K extinguisher is correct?

A

There is no numerical rating for a Class K extinguisher.

43
Q

All portable fire extinguishers use which means for expelling their contents?

A

Pressure

44
Q

What residue does a CO2 fire extinguisher leave when discharged?

A

None

45
Q

In general, the maximum discharge range of a CO2 extinguisher is:

A

8 ft (2.5 m).

46
Q

Which test is required to measure the ability of an extinguisher cylinder to withstand steady internal pressure?

A

Hydrostatic

47
Q

The production and use of Halon extinguishing agents is limited because they are:

A

harmful to the earth’s ozone layer.

48
Q

Bromochlorodifluoromethane is a _________ agent.

A

halon

49
Q

What is the difference between dry powder and dry chemical extinguishing agents?

A

Each is rated for a different class of fire.

50
Q

A loaded stream extinguisher is designed to:

A

resist freezing.

51
Q

Which extinguishing agent is approved for use in a Class K system?

A

Wet chemical

52
Q

A portable fire extinguisher is bested suited for which situation?

A

Fire in a wastebasket

53
Q

Which is used to pressurize a stored-pressure water extinguisher?

A

Air

54
Q

All fire extinguishers are classified according to:

A

the classes of fire on which they are safe and effective.

55
Q

A Class C agent must:

A

not conduct electricity.

56
Q

Class D agents work primarily by:

A

forming a crust over the fuel.

57
Q

What is the best way to extinguish a Class C fire?

A

Shut off the power and treat it as a Class A or B fire

57
Q

A Class A fire extinguisher with a numerical rating of 2 contains _____ of water.

A

2.5 gal (9.5 L)

58
Q

For an extinguishing agent to be rated for a particular class of fire, it must:

A

prevent rekindling.

59
Q

Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?

A

A

60
Q

According to NFPA standards, the maximum floor area that can be protected by each extinguisher is specified according to:

A

occupancy type.

61
Q

For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?

A

They are not necessarily related

62
Q

For an area to qualify for the classification of “light hazard,” most of the combustibles present must be:

A

arranged so that a fire is unlikely to spread.

63
Q

What is the term for the substance that puts out the fire?

A

Extinguishing agent

63
Q

Which hazard category includes automotive service or repair facilities?

A

Extra

64
Q

Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?

A

Cutting off the oxygen supply

65
Q

What is the primary extinguishing mechanism of halogenated agents?

A

Disrupting the molecular chain reaction

66
Q

Which statement about dry chemical agents is correct?

A

Dry chemical agents are not subject to freezing.

67
Q

How do multipurpose dry chemical agents prevent rekindling of Class A fuel?

A

By forming a crust over the fuel

68
Q

Which is a disadvantage of CO2 extinguishers?

A

Short discharge range

69
Q

A Class B foam extinguisher is effective on all of the following fuels except one. Choose the exception.

A

Cooking oil

70
Q

Class B foam fire extinguishers are also effective on:

A

Class A fires.

71
Q

Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?

A

Twisting motion

72
Q

Which part of a fire extinguisher contains the extinguishing agent?

A

Cylinder

73
Q

What expels the extinguishing agent from a pump tank water extinguisher?

A

Manual effort

74
Q

Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?

A

After any discharge

75
Q

A potential problem with application of a multipurpose dry chemical agent to a Class K fire is:

A

counteraction of other agents applied to the fire. / make fire worse

76
Q

Which statement is correct regarding Class D extinguishing agents?

A

The specific agent must be matched to the specific fuel.

77
Q

When approaching a fire with an extinguisher in hand, you should always have a(n):

A

exit route.

78
Q

Which class of fire includes flammable and combustible liquids?

A

B

78
Q

A Class K agent’s effect on the fuel is known as:

A

saponification.

79
Q

Which class of fire includes combustible metals?

A

D

80
Q

Which class of fire includes combustible cooking oils and fats?

A

K

81
Q

What does a rating of 40 on a Class B extinguisher mean?

A

Sufficient extinguishing power for 40 ft² (4.7 m²) of burning fuel

82
Q

Which class of fire is depicted in the pictograph system by a flame and gasoline can?

A

B

83
Q

Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?

A

C

84
Q

Which class of fire is depicted in the pictograph system by a fire in a frying pan?

A

K

85
Q

Requirements for placing and mounting portable fire extinguishers are found in NFPA:

A

10

86
Q

Which fire extinguishing agent is best for use on sensitive electronic equipment?

A

Carbon dioxide

87
Q

Which compound is added to a water extinguisher to improve penetration of fuel?

A

A wetting agent

88
Q

The weight of carbon dioxide is about ___________ times the weight of air.

A

1.5

89
Q

The “P” in the acronym PASS, used in reference to fire extinguisher operation, stands for:

A

pull.

90
Q

The hydrostatic test interval for a dry chemical extinguisher with a stainless-steel shell is every _____ years.

A

5

91
Q

Which agent is rated for use on Class A fires?

A

Ammonium phosphate

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