Fires and Extinguishing Media

Question 1

Combustion
a) is endothermic and can occur in an inert atmosphere
b) is always a visible process in that light is given off
c) is exothermic, self sustaining, and can occur in an inert
atmosphere
d) always requires a source of ignition
e) requires the presence of air

Answer 1

c) is exothermic, self sustaining, and can occur in an inert

atmosphere

Question 2

A reducing agent or fuel could be

a) carbon monoxide
b) a heavy metal oxide
c) hydrogen peroxide
d) concentrated sulphuric acid
e) chlorine

Answer 2

a) carbon monoxide

Question 3

A process which causes fires to endure and renew themselves
is
a) temperature
b) a reducing agent
c) an oxidizing agent
d) a flame
e) molecular activity due to high temperature

Answer 3

e) molecular activity due to high temperature

Question 4

Fuels or reducing agents which burn in the flaming mode only
are
a) flammable liquids
b) coals
c) flammable gases
d) flammable liquids and gases
e) cokes

Answer 4

d) flammable liquids and gases

Question 5

Wood can continue to burn in the flameless or glowing mode
when oxygen level is as low as
a) 17%
b) 12%
c) 8%
d) 5%
e) 3%

Answer 5

d) 5%

Question 6

Your first reaction to a fire should be to

a) fight it
b) contain it
c) turn on the alarm
d) get the nearest fire extinguisher
e) phone the maintenance department

Answer 6

c) turn on the alarm

Question 7

A class B fire is best extinguished by
a) lowering the temperature of the burning wood or paper
b) wetting the burning paper or wood
c) smothering the burning liquid
d) lowering the temperature of the burning liquid
e) creating a chain reaction between the molecules of the
burning material

Answer 7

c) smothering the burning liquid

Question 8

Water is the best extinguisher for

a) an oil fire
b) a gas fire
c) an electrical fire
d) a wood fire
e) a metal burning fire

Answer 8

d) a wood fire

Question 9

A Class “A” fire would involve

a) gasoline or oil
b) any dry materials
c) paint or grease
d) electrical equipment
e) wood or coal

Answer 9

e) wood or coal

Question 10

Foam extinguishers are recommended for

a) Class “A” and Class “B” fires
b) Class “A” and Class “C” fires
c) Class “C” and Class “B” fires
d) Class “D” fires
e) Class “C” and Class “D” fires

Answer 10

a) Class “A” and Class “B” fires

Question 11

Which of the following constitutes a Class “C” fire?

a) fire in a coal bunker
b) fire in a fuel tank
c) fire in a lumber pile
d) fire in an electrical panel
e) fire in a pile of paper

Answer 11

d) fire in an electrical panel

Question 12

The major advantage of carbon dioxide as a fire extinguishing
agent for fires in electronic equipment is it
a) has superior cooling ability over other agents
b) is non-toxic
c) does not reduce the oxygen content of the area
d) does not leave a residue
e) provides a barrier between the oxygen and burning
components

Answer 12

d) does not leave a residue

Question 13

The best portable fire extinguisher to use on a Class "D"
fire is the
a) carbon dioxide unit
b) dry powder unit
c) aqueous film-forming foam unit
d) Halon unit
e) dry chemical unit

Answer 13

b) dry powder unit

Question 14

Dry chemical fire extinguishers should not be used where
delicate electrical equipment is involved because it is
a) conductive
b) an insulator and can be corrosive
c) always corrosive
d) impossible to clean the equipment, it must be replaced
e) capable of producing toxic fumes

Answer 14

b) an insulator and can be corrosive

Question 15

The best type of fire extinguisher to use on an electrical
fire would be a
a) dry chemical extinguisher
b) carbon dioxide extinguisher
c) FF extinguisher
d) dry powder extinguisher
e) foam extinguisher

Answer 15

b) carbon dioxide extinguisher

Question 16

Dry chemical fire extinguishers may be used to extinguish
electrical fires, however, they are not the best choice
because they
a) fail to cool the fire sufficiently
b) conduct electricity
c) leave a residue on the equipment
d) produce toxic chemicals that may be flammable
e) are not made in sizes large enough to fight electrical
fires

Answer 16

c) leave a residue on the equipment

Question 17

Halon extinguishing agents extinguish a fire by

a) cooling below ignition temperature
b) radiation shielding
c) isolating the fuel by coating
d) removing the oxygen supply
e) breaking the uninhibited chain reaction

Answer 17

e) breaking the uninhibited chain reaction

Question 18

To extinguish a fire, aqueous film-forming form extinguishing
agents act in order to:
1. seal vapours
2. cool
3. remove the oxygen
4. break the chain reaction
a) 4
b) 2, 3
c) 1, 2
d) 1, 2, 3
e) 1, 2, 3, 4

Answer 18

d) 1, 2, 3

Question 19

The fire extinguisher to be used on electrical equipment will
be marked with a “C” on a background consisting of a
a) blue circle
b) green triangle
c) yellow star
d) green circle
e) red square

Answer 19

a) blue circle

Question 20

A red square on a fire extinguisher indicates that this
extinguisher is suitable for a Class
a) A fire
b) B fire
c) C fire
d) D fire
e) E fire

Answer 20

b) B fire

Question 21

Burning metals may be extinguished using

a) dry chemical extinguishers
b) carbon dioxide extinguishers
c) AFFF extinguishers
d) dry powder extinguishers
e) foam extinguishers

Answer 21

d) dry powder extinguishers

Question 22

What type of fire should be put out with water?

a) Class “A”
b) Class “B”
c) Class “C”
d) Class “A”, “B”, and “C”
e) Class “D”

Answer 22

a) Class “A”

Question 23

Which of the following extinguishers would ordinarily be used
to combat a Class "C" fire?
1. carbon dioxide
2. foam
3. dry chemical
4. water
a) 1, 2
b) 1, 3
c) 2, 3
d) 2, 4
e) 1, 4

Answer 23

b) 1, 3