NAFA CAFS SAMPLE QUESTIONS AND CORRECT ANSWERS 100%
VERIFIED!! ALREADY GRADED A+
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
, NAFA CAFS SAMPLE QUESTIONS AND CORRECT ANSWERS 100%
VERIFIED!! ALREADY GRADED A+
Velocity Pressure must always be ______? - (ANSWER)Positive
The sum of the static pressure and velocity pressure is? - (ANSWER)Total pressure
What is the primary difference between mechanical and electrostatic filter medias? -
(ANSWER)Mechanical media does not rely on electrostatic charge for efficiencies.
Which of the four filter principles is the main source of filtration in low MERV filters? -
(ANSWER)Impingement
Which of the following products would require an ionizing section - (ANSWER)Electronic Air Cleaner
What does CFM stand for? - (ANSWER)cubic feet per minute
What does FPM stand for? - (ANSWER)feet per minute
Which of the following would be the best description of the straining filtration principle? - (ANSWER)
Static pressure is measured in which direction? - (ANSWER)All directions
Air flows because the fan creates what? - (ANSWER)It creates a positive pressure to the duct system
What happens to our pressure if we enlarge a portion of the duct work to twice the size? -
(ANSWER)Static Pressure goes up
Velocity Pressure goes down
Total Pressure remains the same
VERIFIED!! ALREADY GRADED A+
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
, NAFA CAFS SAMPLE QUESTIONS AND CORRECT ANSWERS 100%
VERIFIED!! ALREADY GRADED A+
Velocity Pressure must always be ______? - (ANSWER)Positive
The sum of the static pressure and velocity pressure is? - (ANSWER)Total pressure
What is the primary difference between mechanical and electrostatic filter medias? -
(ANSWER)Mechanical media does not rely on electrostatic charge for efficiencies.
Which of the four filter principles is the main source of filtration in low MERV filters? -
(ANSWER)Impingement
Which of the following products would require an ionizing section - (ANSWER)Electronic Air Cleaner
What does CFM stand for? - (ANSWER)cubic feet per minute
What does FPM stand for? - (ANSWER)feet per minute
Which of the following would be the best description of the straining filtration principle? - (ANSWER)
Static pressure is measured in which direction? - (ANSWER)All directions
Air flows because the fan creates what? - (ANSWER)It creates a positive pressure to the duct system
What happens to our pressure if we enlarge a portion of the duct work to twice the size? -
(ANSWER)Static Pressure goes up
Velocity Pressure goes down
Total Pressure remains the same
