Indoor Air Quality II

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Question 1

What’s the difference between a contaminant and a pollutant?

A	A contaminant may or may not be a health risk, and a pollutant is always a health risk.
B	A pollutant may or may not be a health risk and a contaminant is always a health risk.
C	There is no difference. Contaminants and pollutants are always health risks
D	There is no difference. Contaminants and pollutants are never health risks

Question 2

Respirable particles that are breathed deep into the lung are commonly

A	100 microns or less
B	50 microns or less
C	40 microns or less
D	10 microns or less

Question 3

Asbestos is made from a mineral called chysolite. If it is breathed into the lungs, it could cause

A	Scarring of the lung tissue
B	Lung cancer
C	damage to the abdomen
D	All of the above

Question 4

The first task a technician should do to improve air quality is to

A	Clean the ventilation system
B	Close off return air, then clean ductwork
C	Change the air filters
D	Open all dampers to supplies

Question 5

Most inexpensive filters are

A	Approximately 7% efficient
B	Approximately 50% efficient
C	Approximately 75% efficient
D	Approximately 90% efficient

Question 6

What is the efficiency of a common pleated filter?

A	5%
B	30%
C	80%
D	90%

Question 7

What type of air filter would remove tobacco smoke particles efficiently?

A	Disposable filters
B	Electronics filters
C	Pleated filters
D	Carbon-type filters

Question 8

Stratification refers to air that

A	Has been overheated
B	Has been overcooled
C	Settles in different temperature layers
D	Has an extreme temperature rise

Question 9

Air must be kept moving

A	To eliminate stratification
B	To prevent a pressure drop
C	To increase a positive building pressure
D	To decrease a positive building pressure

Question 10

Into which four groups are air contaminants classified?

A	Gases/vapors, inert particles, microorganism, pollen
B	Gases/vapors, pollen, radon, organisms
C	Radon, gases/vapors, molds, pollen
D	Pollen, molds, inert particles, microorganisms

Question 11

Man-made fibers, dust and cigarette smoke are in which of the following groups?

A	Vapors
B	Gases
C	Inert particles
D	Organisms

Question 12

Microorganisms include a. Gases and bacteria b. Fungi, mold and bacteria c. Vapors and mold d. Mold and fibers

A	Gases and bacteria
B	Fungi, mold and bacteria
C	Vapors and mold
D	Mold and fibers

Question 13

Which of the following contaminants greatly affect air distribution equipment?

A	Microorganisms
B	Inert particles
C	Gases and vapors
D	Pollens

Question 14

Which of the following are considered to be pollen type contaminants?

A	Molds and bacteria
B	Ragweed and molds
C	Fungi and grass
D	Grass and seasonal plants

Question 15

Symptoms such as eye, nose, and throat irritation; dizziness; headaches; drowsiness; fatigue; and burning eyes are commonly caused by

A	Influenza symptoms
B	Cold symptoms
C	Smoke inhalation symptoms
D	Sick building syndrome (SBS)

Question 16

A satisfactory CO2 measurement in an indoor environment would be

A	A maximum of 1,400 ppm
B	A maximum of 1,200 ppm
C	A maximum of 1,000 ppm
D	A maximum of 800 ppm

Question 17

Indoor air contaminants are

A	Commonly 2-5 times higher in quantity than outdoor air contaminants
B	Commonly 8-10 times higher in quantity than outdoor air contaminants
C	Commonly 12-14 times higher in quantity than outdoor air contaminants
D	Commonly the same quantity as outdoor air contaminants

Question 18

Which illness is commonly caused by untreated cooling-tower water?

A	Influenza virus
B	Parkinson’s disease
C	Legionnaires disease
D	Respiratory symptoms

Question 19

When cleaning nonporous materials, what is commonly used to prevent growth of mold?

A	A non-oil-based detergent
B	A solution of 90% water and 10% bleach
C	50% bleach and 50% soap
D	A toxic solution of 50% bleach and 50% ammonia

Question 20

Some air leakage into a building will help

A	Decrease the temperature rise
B	Increase return air temperatures
C	Reduce indoor air pollution
D	Increase indoor air pollution

Question 21

A high relative humidity within a building can

A	Cause static electricity
B	cause a heating system to overshoot
C	Decrease the supply-air temperature of a heating system
D	Produce mold

Question 22

A ventilation system will exhaust stale indoor air and

A	Eliminate air pollution
B	Maintain a low relative humidity
C	Introduce fresh outside air
D	Maintain a high relative humidity

Question 23

Common types of ventilation systems are

A	Passive and exhaust only types
B	Nonheat recovery units and passive types
C	Balanced mechanical and heat recovery types
D	All of the above

Question 24

What must a public building have for proper ventilation?

A	An outside air supply and an exhaust system
B	Closed dampers to the interior room
C	At least 50% outside air at all times
D	At least 40% outside air at all times

Question 25

A ventilation system producing a slight positive pressure will

A	Reduce heating demands
B	Minimize infiltration
C	Reduce cooling demands
D	Eliminate the need for make-up air

Question 26

What is a VOC ?

A	A highly evaporative chemical that gives off gases
B	A chemical that stays a liquid and has a high boiling point
C	A solid compound that is commonly found in the ground
D	None of the above

Question 27

What symptoms can VOC’s cause in a human being?

A	Rashes and nausea
B	Sinus congestion and drowsiness
C	Headaches and respiratory problems
D	All of the above

Question 28

The radioactive gas that comes from the earth’s crust is known as

A	Phosgene
B	Radon
C	VOC compound
D	Formaldehyde

Question 29

Radon enters the home through

A	Cracks, joints and nontrapped drains
B	Sump pumps and water supplies
C	Underground service openings and crawl spaces
D	All of the above

Question 30

Why does radon commonly stay near ground level?

A	Because it’s lighter than air
B	Because it’s nine times heavier than air
C	Because radioactive particles are commonly attracted to the earth’s crust
D	None of the above

Question 31

Radon is not considered harmful to humans until it

A	Decays
B	Mixes with mold bacteria
C	Mixes with oxygen
D	Is breathed into the lungs

Question 32

Radon levels inside a building should be considered harmful when the average annual concentration in the normal living areas exceeds

A	300 becquerels per cubic meters
B	600 becquerels per cubic meters
C	800 becquerels per cubic meters
D	400 becquerels per cubic meters

Question 33

What organic compounds are produced when materials containing carbon and hydrogen are burned?

A	Hydrogen oxide
B	Polynuclear aromatic hydrocarbons
C	Phosgene gases
D	Halogen gases

Question 34

Outdoor sources of PAH’s are commonly caused by

A	Wood burning appliances
B	Coal burning equipment
C	Internal combustion engines
D	All of the above

Question 35

Indoor sources of PAH’s are commonly caused by

A	Cigarette smoke
B	Burning of food
C	Fireplaces
D	All of the above

Question 36

What is ozone?

A	A stable oxygen molecule
B	1 oxygen atom and 1 hydrogen atom
C	A makeup of oxygen and nitrogen molecules
D	3 oxygen atoms

Question 37

How is ozone produced?

A	When air is heated by the sun and the humidity is increased
B	When clorine is released to atmosphere
C	During an electrical storm
D	Both A and B

Question 38

The level of ozone inside the home

A	Is directly correlated with the levels outside the home
B	Is commonly higher than the levels outside the home
C	Is caused by heat producing appliances
D	None of the above

Question 39

Nitric oxide (NO) is a poisonous gas that is produced

A	During low temperature combustion
B	When there is a lack of primary air
C	When the combustion process has been delayed
D	During high temperature combustion

Question 40

Nitric oxide is

A	Highly toxic
B	Nontoxic
C	Flammable
D	Explosive

Question 41

Common indoor levels of nitric oxide are

A	0.025 ppm or less
B	5 ppm or less
C	20 ppm or less
D	50 ppm or less

Question 42

Nitric oxide and nitrogen dioxide are produced when

A	Fuel burning appliances are not vented
B	Nitrogen and oxygen are mixed
C	Carbon dioxide and oxygen are combined
D	Nitric oxide and nitrogen dioxide are produced when

Question 43

Once nitric oxide is released into the air, it quickly changes to

A	Carbon dioxide
B	Carbon monoxide
C	Nitrogen
D	Nitrogen dioxide

Question 44

Carbon monoxide (CO) is a poisonous gas that is produced

A	During complete combustion of gas products
B	During incomplete combustion of fossil fuels
C	During any burning of fuels, as it’s a product of combustion
D	All of the above

Question 45

Indoor sources of carbon monoxide are

A	Cracked heat exchangers and chimneys
B	Unvented appliances
C	Cigarette smoke
D	All of the above

Question 46

Average indoor levels of carbon monoxide range from

A	.5 to 5 ppm
B	8 to 10 ppm
C	10 to 15 ppm
D	20 to 50 ppm

Question 47

If a home has excessive negative pressure, the combustion gases of an appliance could

A	Enter back into the home
B	Produce carbon monoxide
C	Produce ozone
D	Both A and B

Question 48

What type of contaminant is formaldehyde?

A	A VOC
B	An inert particle
C	A microorganism
D	None of the above

Question 49

Medium-density fiberboard (MDF) and particle board inside a home are common sources of which indoor contaminant?

A	Formaldehyde
B	Nitric acid
C	Carbon monoxide
D	Excessive CO2

Question 50

The rate at which formaldehyde gas is released in a home is directly proportional to

A	An increase of humidity and a decrease of temperature
B	A decrease of humidity and an increase of temperature
C	A decrease of humidity and a decrease of temperature
D	An increase of humidity and an increase of temperature

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Tek Assist - NATE Core and Specialties Tests

Indoor Air Quality II

Indoor Air Quality II

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