CAFS

Question 1

the ratio of the foam’s volume in its aerated state as
compared to the original volume of the non-aerated
solution is called the _______.

Answer 1

expansion ratio (gallons solution:gallons finished foam)

Question 2

Low-X expansion ratio is between:

Answer 2

1:1 to 20:1

Question 3

Mid-X expansion ratio is between:

Answer 3

21:1 to 200:1

Question 4

Hi-X expansion ratio is between:

Answer 4

201:1 to 1000:1

Question 5

the time it takes for foam bubbles to pop is called?

Answer 5

drain time

Question 6

the higher the expansion ratio, the ______ the

drain time.

Answer 6

longer

Question 7

the dryer the foam, the ______ the drain time.

Answer 7

longer

Question 8

the minimum rate at which a foam solution or finished
foam can be applied to a given fire in order to achieve
extinguishment is called the ______.

Answer 8

critical application rate

Question 9

3 parts to a CAFS

Answer 9

air compressor
water pump
foam injector

Question 10

3 types of air compressors

Answer 10

1) reciprocating piston
2) rotary vane
3) rotary screw

Question 11

nozzles that introduce air into a foam solution by the

Venturi Principle are called ______.

Answer 11

aspirating nozzles

Question 12

the rapid pressurization of a structure caused by an
increased heat absorbtion which causes a rapid steam
expansion and penetration and can aid in exterior
firefighting is called ______.

Answer 12

compressed air foam push

Question 13

foam solution that has been aerated is called ____.

Answer 13

finished foam

Question 14

finished foam that is produced when metered at a
1:1 ratio. this foam type is recommended for _____
because it will stick to vertical surfaces and typically
has a longer drain time. it resembles _____ and is
called ______.

Answer 14

exposure protection
shaving cream
fluid foam

Question 15

device that allows foam concentrate and water to mix

is called a _____.

Answer 15

foam proportioner

Question 16

mixture of foam concentrate and water is called ____.

Answer 16

foam solution

Question 17

4 components of the Foam Tetrahedron

Answer 17

1) water
2) foam
3) air
4) agitation

Question 18

foam generating systems that includes the energy of
an air compressor to the energy of a water pump are
called _____.

Answer 18

high energy systems

Question 19

foam generating systems that uses the velocity of a
a water stream to mix air with the solution at the nozzle
tip to deliver finished foam are called ______.

Answer 19

low energy systems

Question 20

NAFS

Answer 20

nozzle aspirated foam system

Question 21

CAFS

Answer 21

compressed air foam system

Question 22

rotary screw air compressors are capable of achieving
output pressures over _____ psi and output volumes
over _____ cfm.

Answer 22

200

1500

Question 23

a dangerous condition in CAFS when the foam solution
is not rich enough or unevenly mixes with air and causes
pockets(______) of water and air to the nozzle. this is
called _____.

Answer 23

slugs

slug flow

Question 24

_____ lower the surface tension of a liquid.

Answer 24

surfactants

Question 25

a method of foam application for exposure protection
using a 2-layered foam blanket. wet foam is applied
first and then followed by a layer of fluid foam. this
provides a stronger insulation against radiant heat or
direct flame contact. this is called

Answer 25

2-tier exposure protection

Question 26

as water flows through a constricted pipe, velocity
increases and pressure is reduced allowing foam
concentrates to be introduced to the water supply.
the principle behind this is called _____.

Answer 26

the venturi effect

Question 27

“very wet foam” has a ratio of _____?

it is recommended for _____.

Answer 27

3:1 (water:air)

master stream operations

Question 28

“wet foam” has a ratio of _____? and is recommended

for most applications on ______ fires. it resembles ___.

Answer 28

2:1 (water:air)
Class A
ice cream