NAFA CAFS Test Exam Study
Guide – Practice Questions
with Verified Answers. GRADED
A+. Latest 2026/2027 Update.
Aerosols cover a wide range of sizes. True or false? - Answer✔✔-True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - Answer✔✔-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. -
Answer✔✔-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? - Answer✔✔-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? -
Answer✔✔-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. - Answer✔✔-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? -
Answer✔✔-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 ____________. - Answer✔✔-
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 ___________
____ _____ ________. - Answer✔✔-Approximately the same diameter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
What is capacity? - Answer✔✔-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? - Answer✔✔-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? - Answer✔✔-False. A panel filter has the same media velocity as face
velocity.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1
Guide – Practice Questions
with Verified Answers. GRADED
A+. Latest 2026/2027 Update.
Aerosols cover a wide range of sizes. True or false? - Answer✔✔-True.
NAFA Guide to Air Filtration, 5th ed. 2014, page 1.2
A micron is approximately ___________ of an inch. - Answer✔✔-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. -
Answer✔✔-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? - Answer✔✔-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? -
Answer✔✔-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. - Answer✔✔-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? -
Answer✔✔-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 ____________. - Answer✔✔-
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 ___________
____ _____ ________. - Answer✔✔-Approximately the same diameter.
NAFA Guide to Air Filtration, 5th ed. 2014, page 2.6
What is capacity? - Answer✔✔-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? - Answer✔✔-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? - Answer✔✔-False. A panel filter has the same media velocity as face
velocity.
NAFA Guide to Air Filtration, 5th ed. 2014, page 3.1
