NAFA CAFS Sample Questions with || || || || ||
verified detailed answers || ||
1 millionth of a meter is called a _____? - Correct answer ✔Micrometer or
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Micron
The air we breath is composed mainly of ______? - Correct answer ✔Nitrogen
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The size of particles in outdoor air are mainly _____ and smaller - Correct
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answer ✔1 micrometer || ||
___________ (size) particles behave like a gas, have negligible settling rates,
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and are affected by Brownian Motion. - Correct answer ✔Particles less than 0.1
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micrometers
Rated flow of air through a filter at specified pressure drop is called _____? -
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Correct answer ✔Capacity || ||
The four principles of air filtration are? - Correct answer ✔1. Impingement
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2. Interception
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3. Diffusion
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4. Straining
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, If Static Pressure goes up, Velocity Pressure goes _______? - Correct answer
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✔Down (SP + VP = TP) || || || || ||
In the filter industry, a manometer is used to measure? - Correct answer
|| || || || || || || || || || || || ||
✔Pressure drop across a filter || || || ||
An Electronic Air Cleaner collects particles by? - Correct answer
|| || || || || || || || || ||
✔Electrostatically charging them and collecting them on oppositely charged || || || || || || || || ||
plates.
What is the formula for expressing air flow through a duct? - Correct answer
|| || || || || || || || || || || || || ||
✔Q=A*V
Quantity = Area of the Duct * Velocity of Air || || || || || || || || ||
_____________ is the pressure within the duct that is capable of bursting the || || || || || || || || || || || || ||
duct and may be positive or negative. - Correct answer ✔Static Pressure
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Velocity Pressure must always be ______? - Correct answer ✔Positive
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The sum of the static pressure and velocity pressure is? - Correct answer ✔Total
|| || || || || || || || || || || || || ||
pressure
What is the primary difference between mechanical and electrostatic filter
|| || || || || || || || || ||
medias? - Correct answer ✔Mechanical media does not rely on electrostatic
|| || || || || || || || || || ||
charge for efficiencies. || ||
verified detailed answers || ||
1 millionth of a meter is called a _____? - Correct answer ✔Micrometer or
|| || || || || || || || || || || || || ||
Micron
The air we breath is composed mainly of ______? - Correct answer ✔Nitrogen
|| || || || || || || || || || || ||
The size of particles in outdoor air are mainly _____ and smaller - Correct
|| || || || || || || || || || || || || ||
answer ✔1 micrometer || ||
___________ (size) particles behave like a gas, have negligible settling rates,
|| || || || || || || || || || ||
and are affected by Brownian Motion. - Correct answer ✔Particles less than 0.1
|| || || || || || || || || || || || ||
micrometers
Rated flow of air through a filter at specified pressure drop is called _____? -
|| || || || || || || || || || || || || || ||
Correct answer ✔Capacity || ||
The four principles of air filtration are? - Correct answer ✔1. Impingement
|| || || || || || || || || || ||
2. Interception
||
3. Diffusion
||
4. Straining
||
, If Static Pressure goes up, Velocity Pressure goes _______? - Correct answer
|| || || || || || || || || || || ||
✔Down (SP + VP = TP) || || || || ||
In the filter industry, a manometer is used to measure? - Correct answer
|| || || || || || || || || || || || ||
✔Pressure drop across a filter || || || ||
An Electronic Air Cleaner collects particles by? - Correct answer
|| || || || || || || || || ||
✔Electrostatically charging them and collecting them on oppositely charged || || || || || || || || ||
plates.
What is the formula for expressing air flow through a duct? - Correct answer
|| || || || || || || || || || || || || ||
✔Q=A*V
Quantity = Area of the Duct * Velocity of Air || || || || || || || || ||
_____________ is the pressure within the duct that is capable of bursting the || || || || || || || || || || || || ||
duct and may be positive or negative. - Correct answer ✔Static Pressure
|| || || || || || || || || || ||
Velocity Pressure must always be ______? - Correct answer ✔Positive
|| || || || || || || || ||
The sum of the static pressure and velocity pressure is? - Correct answer ✔Total
|| || || || || || || || || || || || || ||
pressure
What is the primary difference between mechanical and electrostatic filter
|| || || || || || || || || ||
medias? - Correct answer ✔Mechanical media does not rely on electrostatic
|| || || || || || || || || || ||
charge for efficiencies. || ||
