BPI BA Study Set Questions with Correct Answers New Update
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Course
BPI BA
Institution
BPI BA
BPI BA Study Set Questions with Correct Answers New Update
What are 4 types of DHWs? - Answer free standing, tankless, solar, indirect
What is flame roll out? - Answer severe and dangerous form or back drafting
What does AFUE stand for? - Answer Annual fuel Utilization Efficiency - the M...
BPI BA Study Set Questions with
Correct Answers New Update
What are 4 types of DHWs? - Answer ✔ free standing, tankless, solar, indirect
What is flame roll out? - Answer ✔ severe and dangerous form or back drafting
What does AFUE stand for? - Answer ✔ Annual fuel Utilization Efficiency - the MPG for
fossil fuel burning devices.
What two things must you do before entering a bldg according to BPI standards? -
Answer ✔ Turn on gas sniffers and CO devices to calibrate then in outdoor air.
Where are common areas/spots for gas leaks? - Answer ✔ unions, regulators, orifices,
connections
What are 5 reasons that flue gases will not go up a chimney? - Answer ✔ blocked
chimney, high negative pressure in CAZ, incorrect chimney diameter, incorrect chimney
height, incorrect flue pitch.
What is the definition of a class I system and how do you identify them? - Answer ✔
natural or atmospheric draft or fan induced or assisted draft, metal flue, masonry or B-
vent, noncondensing, 70-83% combustion efficiency, standard venting. Negative
pressure
What is the definition of a class IV system and how do you identify them? - Answer ✔
condensing, positive pressure, direct vent or power vented, or sealed combustion 84-
90+% efficiency, condensing
What is a by product of 90% combustion devices? - Answer ✔ water condensate
What is the purpose of barometric dampers and where are they found? - Answer ✔ to
let cool air into the chimney to cool it off to prevent over fire, moderates excessive
updrafts and diverts down drafts that might interfere with burner/pilot
The are typically found on fuel oil burning devices.
What fuel type must always use a barometric draft control? - Answer ✔ fuel oil
,What makes a class IV device safer than a class I? - Answer ✔ If its installed as a
sealed combustion device - the home cannot tug at the flue during the combustion
process with negative pressures when operating. Cat. IV also has lots more safety
features built in.
what is draft a measurment of? - Answer ✔ pressure in the flue vent - typically
measured in pascals or inches of water column IWC
when measuring for baseline in the CAZ, should the CAZ door be open or closed? -
Answer ✔ closed
what is flame impingment? - Answer ✔ when the flame in a combustion appliance
strikes anything that can pull the heat away - typically metal. Etc - a burner on a gas
stove with flames touching the metal grates or cooking pots. Because the flame is
cooled - incomplete combustion results.
what is the only home BPI does not require a CO monitor in? - Answer ✔ home with all
electric appliance and no attached garage
is propane heavier or lighter than air? - Answer ✔ heavier
is natural gas heavier or lighter than air? - Answer ✔ lighter
what does the temperature of a flue have to do with impact of draft? - Answer ✔ the
higher the temp the stronger the negative draft
What % of air is oxygen? - Answer ✔ 21%
what is a Heating Degree Day? - Answer ✔ each degree that the average daily
temperature is below the base temperature (65 degrees F) is one heating degree day.
HDD
If the high was 60 degrees F and the low was 30 degrees F, how many HDDs occured?
- Answer ✔ base temp-delta T so 60+30 divided by 2=45. 45 is the delta T. so 65(which
is the base temp always) minus 45 =20 HDDs
Heat will always move from - Answer ✔ hot to cold (more to less) 2nd law of
thermodynamics
pressure will always move from - Answer ✔ high to low (more to less) 2nd law of
thermodynamics
moisture will always move from - Answer ✔ wet to dry (more to less) 2nd law of
thermodynamics
, what 2 things are needed for air to move? - Answer ✔ a hole and change in pressure
if condensation occurs on a window, what 2 things must be true? - Answer ✔ the
window surface is below dew point and there is moisture in the air
if air is heated, does the relative humidity go up or down? - Answer ✔ down
what is the definition of the building envelope? - Answer ✔ the part of the building that
separates indoor and outdoor spaces. The envelope is made of the thermal and air
barrier. They have to touch each other continuously to be effective.
what is a vapor diffusion retarder? - Answer ✔ the new term for vapor barriers
what natural force is a vapor diffustion retarder attempting to stop? - Answer ✔ diffusion
define vapor diffusion - Answer ✔ flow of water vapor from wetter to dryer typically
through a solid material
what does a sling psychrometer measure? - Answer ✔ wet bulb temperature
how many thermometers does a sling psychrometer have to measure RH? - Answer ✔
two
what is the soffit? - Answer ✔ under side of the roof overhang where attic ventilation air
enters or a small lowered ceiling like above cabinets or a shower
what does a blower door measure>? - Answer ✔ air leakage in air changes per hour.
Can also measure the square inches of holes in a building air barrier
what is the single most important thing to do if attempting to control moisture in the
home? - Answer ✔ control air flow/leaks
if a house has 50 CFM going out through the bath exhaust,how many CFM must be
coming back in? - Answer ✔ 50 CFM, for every 1 cfm in, there is 1 cfm out
when air sealing a home you should always start where? - Answer ✔ you always start at
the top to defeat the cause of stack effect. This lowers the Neutral Pressure Plane and
avoids negative pressures in the bottom of the building which could cause backdrafting
of atmospheric appliances.
define stack effect - Answer ✔ draft established in a building from air infiltrating low and
exfiltrating high due to convection
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