NAFA CAFS Test 2024 (This Quizlet is based on
questions that were in the NAFA CAFS test, April
2024. The NAFA CAFS test has 70 multiple choice
questions, and 30 true/false.) Graded A+
Aerosols cover a wide range of sizes. True or false? - (answers)True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - (answers)1/25,400".
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
Particle counters used to use tungsten light, and were limited to measuring particle
sizes down to 0.3 microns. Newer units, using ___________ as a source of light, have
the capability of counting particles smaller than 0.1 micron. - (answers)Lasers.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5
If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream of 2000cfm,
what would your velocity(fpm) be? - (answers)41.66fpm.
V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.1
Electronic Air Cleaners are externally powered devices. True or false? - (answers)True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.3
The thicker the filter media and the closer the orientation of fibers, the ________ the
possibility of collision by a fiber. - (answers)Greater.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4
Impingement filters are frequently treated with adhesives that coat the fibers and create
a bond between the particle and the fiber. True or false? - (answers)True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.5
A dipole moment is when there is a ________ _____________ of electrons at ____
_______ of a molecule than there is at ____________. - (answers)Greater
concentration.
, One end.
Another.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
The strongest force occurs between particles and fibers that are ___________ ____
_____ ________. - (answers)Approximately the same diameter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
What is capacity? - (answers)The amount of air that a filter can handle. (cfm)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.7
What is dust holding capacity? - (answers)The amount of dust retained by a filter to its
final recommended pressure drop.
NAFA Guide to Air Filtration, 5th ed. 2014, page 17.5
A panel filter has a media velocity that is lower than it's face velocity. True or false? -
(answers)False. A panel filter has the same media velocity as face velocity.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1
Airborne particles are attracted to fibers that have a charge opposite of their own. This
attraction is diminished when the air is _______, and as particles build up on the fibers.
- (answers)Humid.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.3
Lofted microglass media(glass mat) is manufactured by spraying the fibers onto a
_______ _________, and collected on a conveyor in the form of a mat.
They require backing material to provide physical support. Backing can not be applied
at the time the mat is formed. True or false? - (answers)Colored binder.
False. Backing material can be applied at the time the mat is formed of the mat and
backer can be combined just before the incorporation into a filter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 4.2
Where in-line space is restricted, you would most likely use a _______ _____ filter. -
(answers)Rigid box.
NAFA Guide to Air Filtration, 5th ed. 2014, page 4.4
questions that were in the NAFA CAFS test, April
2024. The NAFA CAFS test has 70 multiple choice
questions, and 30 true/false.) Graded A+
Aerosols cover a wide range of sizes. True or false? - (answers)True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - (answers)1/25,400".
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
Particle counters used to use tungsten light, and were limited to measuring particle
sizes down to 0.3 microns. Newer units, using ___________ as a source of light, have
the capability of counting particles smaller than 0.1 micron. - (answers)Lasers.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.5
If you have a 20x24x12 filter, with 48sq. ft. of media, placed in an airstream of 2000cfm,
what would your velocity(fpm) be? - (answers)41.66fpm.
V(fpm)=Q(cfm)/A(Sq. ft. of media)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.1
Electronic Air Cleaners are externally powered devices. True or false? - (answers)True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.3
The thicker the filter media and the closer the orientation of fibers, the ________ the
possibility of collision by a fiber. - (answers)Greater.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.4
Impingement filters are frequently treated with adhesives that coat the fibers and create
a bond between the particle and the fiber. True or false? - (answers)True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.5
A dipole moment is when there is a ________ _____________ of electrons at ____
_______ of a molecule than there is at ____________. - (answers)Greater
concentration.
, One end.
Another.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
The strongest force occurs between particles and fibers that are ___________ ____
_____ ________. - (answers)Approximately the same diameter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
What is capacity? - (answers)The amount of air that a filter can handle. (cfm)
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.7
What is dust holding capacity? - (answers)The amount of dust retained by a filter to its
final recommended pressure drop.
NAFA Guide to Air Filtration, 5th ed. 2014, page 17.5
A panel filter has a media velocity that is lower than it's face velocity. True or false? -
(answers)False. A panel filter has the same media velocity as face velocity.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1
Airborne particles are attracted to fibers that have a charge opposite of their own. This
attraction is diminished when the air is _______, and as particles build up on the fibers.
- (answers)Humid.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.3
Lofted microglass media(glass mat) is manufactured by spraying the fibers onto a
_______ _________, and collected on a conveyor in the form of a mat.
They require backing material to provide physical support. Backing can not be applied
at the time the mat is formed. True or false? - (answers)Colored binder.
False. Backing material can be applied at the time the mat is formed of the mat and
backer can be combined just before the incorporation into a filter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 4.2
Where in-line space is restricted, you would most likely use a _______ _____ filter. -
(answers)Rigid box.
NAFA Guide to Air Filtration, 5th ed. 2014, page 4.4
