Mod 28 Exam

Dust particles are usually ___ microns in size

1-200

carbon monoxide is

a result of incomplete combustion of fuel

the ____ Test measure the ability of an air filter to remove atmospheric dust by evaluating the flow rates on both sides of the filter and measuring the quantity of material it captures

atmospheric dust spot efficiency

ASHARE standard 62.1 ties ventilation rates to the number of occupants in a given space True or False

false

HEPA filters tend to decline in performance over time True or False

false

an HRV transfers humidity as well as heat true or false

false

ionic and electronic air cleaners perform significantly better than HEPA filters True or False

false

____ is an advanced technique used to measure air filter performance in which extremely accurate equipment is used to count the number of particles trapped by the filter and also classify the particles by size

fractional efficiency

small solid particles suspended in air and formed by the condensation and solidification of gaseous materials are called____

fumes

airborne microorganisms, such as viruses, fungi, mildew, and yeast are called___ fumes bacteria bioaerosols none of the above

none of the above

a ventilation system is usually designed to allow the air filter pressure drop to be about ____ of the total pressure drop

one-fourth

a gas that can function as a disinfectant in certain applications but can be detrimental to human health in higher does describe

ozone

____ filters use an electrostatic charge that is produced by the friction of air blowing across the fibers in the filter

passive electrostatic

ultraviolet lights ____

are harmful to eyes and skin

air filters should be changed at approximately ____ of design final resistance

80%

ultraviolet lamps should handle ____ of the bacteria in residential and commercial systems

80-90%

electronic air cleaners use a prefilter to give a negative charge to passing particles True or False

False

certain types of ____ act as breeding grounds for various microorganisms water spray systems humidifiers wet porous surfaces all of the above

all of the above

____ is/are composed of solid particles carried into the atmosphere by gaseous products of incomplete combustion

smoke

Ashrae standard 52.2 rates a filters efficiency by the size of the particle that the filter will capture true or false

true

Ionizing air cleaners may produce ozone as a by product True or False

true

air filters tend to unload excess contaminants once their capacity has been reached True or False

true

many typical air-conditioning applications provide a favorable, damp environment for the growth and development of mold True or False

true

ozone can be used to purify water, remove odors, of to maintain a sterile atmosphere True or False

true

an ERV is ____

used where humidity control is important