NAFA CAFS Test 2025
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 ____ _______ or
_____ of a molecule than there is at ____________. - ANSWER Greater concentration.
One point or 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
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 ____ _______ or
_____ of a molecule than there is at ____________. - ANSWER Greater concentration.
One point or 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
