NAFA CAFS SAMPLE QUESTIONS
1 millionth of a meter is called a _____? - ANSWER -
Micrometer or Micron
The air we breath is composed mainly of ______? - ANSWER -
Nitrogen
The size of particles in outdoor air are mainly _____ and smaller
- ANSWER -1 micrometer
___________ (size) particles behave like a gas, have negligible
settling rates, and are affected by Brownian Motion. - ANSWER
-Particles less than 0.1 micrometers
Rated flow of air through a filter at specified pressure drop is
called _____? - ANSWER -Capacity
The four principles of air filtration are? - ANSWER -1.
Impingement
, 2. Interception
3. Diffusion
4. Straining
If Static Pressure goes up, Velocity Pressure goes _______? -
ANSWER -Down (SP + VP = TP)
In the filter industry, a manometer is used to measure? -
ANSWER -Pressure drop across a filter
An Electronic Air Cleaner collects particles by? - ANSWER -
Electrostatically charging them and collecting them on
oppositely charged plates.
What is the formula for expressing air flow through a duct? -
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. - ANSWER
-Static Pressure
1 millionth of a meter is called a _____? - ANSWER -
Micrometer or Micron
The air we breath is composed mainly of ______? - ANSWER -
Nitrogen
The size of particles in outdoor air are mainly _____ and smaller
- ANSWER -1 micrometer
___________ (size) particles behave like a gas, have negligible
settling rates, and are affected by Brownian Motion. - ANSWER
-Particles less than 0.1 micrometers
Rated flow of air through a filter at specified pressure drop is
called _____? - ANSWER -Capacity
The four principles of air filtration are? - ANSWER -1.
Impingement
, 2. Interception
3. Diffusion
4. Straining
If Static Pressure goes up, Velocity Pressure goes _______? -
ANSWER -Down (SP + VP = TP)
In the filter industry, a manometer is used to measure? -
ANSWER -Pressure drop across a filter
An Electronic Air Cleaner collects particles by? - ANSWER -
Electrostatically charging them and collecting them on
oppositely charged plates.
What is the formula for expressing air flow through a duct? -
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. - ANSWER
-Static Pressure
