NAFA CAFS Sample Questions With 100% Correct Answers.

NAFA CAFS Sample Questions With 100% Correct Answers. 1 millionth of a meter is called a _____? - answerMicrometer or Micron The air we breath is composed mainly of ______? - answerNitrogen The size of particles in outdoor air are mainly _____ and smaller - answer1 micrometer ___________ (size) particles behave like a gas, have negligible settling rates, and are affected by Brownian Motion. - answerParticles less than 0.1 micrometers Rated flow of air through a filter at specified pressure drop is called _____? - answerCapacity The four principles of air filtration are? - answer1. Impingement 2. Interception 3. Diffusion 4. Straining If Static Pressure goes up, Velocity Pressure goes _______? - answerDown (SP + VP = TP) In the filter industry, a manometer is used to measure? - answerPressure drop across a filter An Electronic Air Cleaner collects particles by? - answerElectrostatically charging them and collecting them on oppositely charged plates. What is the formula for expressing air flow through a duct? - answerQ=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. - answerStatic Pressure Velocity Pressure must always be ______? - answerPositive The sum of the static pressure and velocity pressure is? - answerTotal pressure What is the primary difference between mechanical and electrostatic filter medias? - answerMechanical media does not rely on electrostatic charge for efficiencies.