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RATER PRACTICE TEST
What two components must be present for air to across the building enevelope? - ANSWERS-A hole and Pressure difference When blower door Testing a home with a basement which is NOT true? - ANSWERS-either way is fine as the volume of the basement is added in the calculations When comparing the theoretical reference home to the rated home which of following statements is NOT true: - ANSWERS-the reference home does not have the same gross area as the rated home When doing a blower door test on a house, what should be done with the closest doors? - ANSWERS-Open closet door if there is a window or attic access in it. When installing correctly-sized equipment instead of over sized equipment in a house the needed to install tighter ducts increases in a importance because: - ANSWERS-The blower operates a higher percentage of time where is the leak in a return system of an HVAC system located if the house is pressurized while the system is running? - ANSWERS- outside condtioned space
which of the following accounts for 20 - 60% of the total water heating energy? - ANSWERS-Water standby Which of the following forces can drive mass water into a structure? - ANSWERS-* gravity *Pressures made by wind *capillary action (all of the above) Which of the following is the best resource for finding efficiencies of an electric heater? - ANSWERS-AHRI Which of the following is true about sizing a furnace is a cooling dominated climate? - ANSWERS-Since the furnace air handler is also acting as the air handler for the AC, the blower must be able to handle the amount of air needed to meet the cooling load Which of the following minimum rated features is NOT included in the HERS index? - ANSWERS-A power attic ventilation fan Which of the following organizations is the best resource for finding the efficiency of an electric water heater? - ANSWERS-AHRI (air conditioning heating and refrigeration institute) Which statement best describes the primary function of a standard disclosure notice? - ANSWERS-Notifies the customer of the potential for bias or conflict of interest
In the climate zone would a house be found that has 10,600 heating degree days and receives approximately 25 to 30 inches if rain year? - ANSWERS-Cold One kWh equals - ANSWERS- 3412 Btu what is a common unit used when comparing fuels such as oil,gas and Lp? - ANSWERS-mmbtu what is the heat transfer for a ceiling having measurements of 30'X 60' with R-38 if the inside temperature is 72 and the outside temperature is 25? - ANSWERS-22,000 btu/hr what range of room relative humidity is considered for home occupants? - ANSWERS-30%-50% When does condensation occur? - ANSWERS-when the temperature of a surface is less than the dew point Which of the following has greater BTU capacity? - ANSWERS- 1 gallon heating oil Which of the following situations would most likely degrade the indorr air quality? - ANSWERS-Leaks in the return plenum of an 80% AFUE furnace located in a closet within the building
Which of the following mechanisms of heat transfer would account for frost on a roof even when the ambient temperature is above freezing? - ANSWERS-Radiation Without changing the grains of water in the air, if the air is heated the RH will: - ANSWERS-decrease 1185 square feet of an attic is insulated to R-30. there is 15 square feet of attic hatch insulated at R-3. What is the average R-Value for the entire attic? - ANSWERS-27. If the thermal mass increases .... - ANSWERS-the steady state R- value is not affected by the thermal mass The " design temperature" is the temperature equaled or exceeded 99% of the time during what three winter months - ANSWERS- December, January, and Feburary The term "Thermal mass" refers to material having: - ANSWERS-The ability to store heat What is the air exiting a structure through cracks and/or holes called?
- ANSWERS-Exfiltration Annual heating loads are expressed in - ANSWERS-mmbtu
If a multi point blower door test is preformed instead of a single point blower door test, what additional information can gained? - ANSWERS-The infiltration rate at any pressure difference A 1000 sq/ft attic has 750sq/ft insulated to R-30 and 250 sq/ft insulated to R-19. What is the overall average R-Value of the attic? - ANSWERS-26. According to RESNET guidelines when preforming combustion appliance testing, what is the first action item? - ANSWERS- Determine if there are gas leaks in the fittings and connections of natural gas supply lines within the home A duct leakage test is preformed at what standard of pressure? - ANSWERS-25 pascals A house is measured to be 35' x 47'. What is the area of the floor and what is perimeter - ANSWERS-1645 and 164 A room's dimensions are 28' x 28' with a wall height of 10' and a cathedral ceiling (center peak) of 18' above the floor. What is the area of the cathedral ceiling? - ANSWERS-909 sq feet A round room having a diameter 12' and a ceiling height of 12 - foot would have a volume of approximately: - ANSWERS-1356 Cu ft
According to RESNET, what does the term "effective R-value" imply? - ANSWERS-The R-value is better than the steady state rating assuming the stack effect is the only driving force, the house will leak: - ANSWERS-above and below the natural pressure plane Besides an IR camera, what is a non-invasive way to determine if there is insulation in an exterior wall? - ANSWERS-Remove a face plate from an outlet or switch and inspect around the box For a traditional vented crawlspace, where should the thermal boundary be placed? - ANSWERS-on the underside of the floor above For an existing house with crawl space, where do you inspect to evaluate the crawlspace insulation? - ANSWERS-The floor above the crawlspace and the assembly of the foundation wall How many inches of insulation are usually found at the bottom chord of commonly used roof truss? - ANSWERS-3 1/2 inches In a vented crawlspace, if the nail ends penetrating the subfloor above the insulation are rusty, it's a good indication of what? - ANSWERS- Warm moist air has been circulating above the floor insulation because the insulation was not properly installed
When preparing for a blower door test with the use of digital manometer, the initial baseline pressure reading is a measure of what 2 effects on a house? - ANSWERS-Stack effect and Wind When using spray polyurethane foam insulation in a habitual area, which of the following is requited - ANSWERS-cover with an approved thermal barrier where is the leak in a return of an HVAC system located if the house is pressurized while the system is running - ANSWERS-outside the conditioned space Which of the following proceudre's is deemed the most accurate way of measuring duct leakage-to-outside? - ANSWERS-Blower door and duct pressurization tests together which of the following insulation types will work outside foundation in contact with the soil? - ANSWERS-Extruded polystyrene which of the following is used to describe a building material's resistance to heat flow? - ANSWERS-R-value A heat pump can have an efficiency greater than 100% because: - ANSWERS-it moves heat from one place to another instead of converting fuel to heat
by holding a match close to a window assembly you can sometimes verify the presence of: - ANSWERS-The presence of low-E coating Heat pumps do not get heat from which of the following - ANSWERS-The building's materials` In new homes what component of the house generally allows the most heat transfer? - ANSWERS-the windows One not so obvious benefit of installing energy efficient appliances is that they - ANSWERS-can reduce air conditioning costs The Cop used for expressing the efficiency of the geothermal heat pump is defined as..... - ANSWERS-The output of a heat pump in watt-hours of heat moved divided by watt-hours of electrical input The correct means of identifying the compass direction of wall is to be outside and: - ANSWERS-have your back to the wall and read the compass What is the best term of express the efficiency of a gas furnace and an air condition - ANSWERS-AFUE/SEER What is the delivered efficiency of heating system that has an efficiency of 0.80 and distribution efficiency of 0.88? - ANSWERS- 70%
A good elevation drawing will show which of the following about windows: - ANSWERS-*Window locations *overhangs *window areas (all of the above) A person exposed to levels of carbon monoxide around 400 ppm for 1 to 2 hours would probably exhibit which of the following health effects - ANSWERS-Serious headache Which of the following item should be emphasized in the work scope? - ANSWERS-bringing air distribution system components inside the building enclosure when feasible A provider can conduct an independent quality assurance (QA) inspection - ANSWERS-At any time without the permission of the rater A rater can best demonstrate he/she is doing quality work by - ANSWERS-having complete, accurate and well documented rating files A rater must always reveal financial interests in a project to - ANSWERS-both client and the provider A VA EEM loan allows a maximum of - ANSWERS-$
A vapor retarder when used in a hot humid climate is installed on what portion of the home's exterior wall? - ANSWERS-The outside of the wall According to ASHRAE 62.2, what would be the approximate ventilation rate for a 2500 square foot home with 4 bedrooms? - ANSWERS- 63 An AC system having capacity of 30,000 Btu/hr would be said to have how many tons? - ANSWERS-2.5 tons An architect chooses a scale of 1/4 = 1 foot to be used on a set of house plans. The actual house will be how many times larger than the drawings? - ANSWERS-48 times bigger An architect draws the floor plan of a house of 3/16" = 1 foot. A wall measuring 6-3/4 on the scaled drawing would be what length? - ANSWERS-36 feet An EEM uses a home energy rating for what purpose? - ANSWERS- the calculated yearly energy savings are added to the borrower's income to allow the home buyer to qualify for a larger total mortgage An elevation shows: - ANSWERS-one side of the house as viewed from straight on
How does one find the CFMnat? - ANSWERS-CFMnat = CFM50/ n How is a home energy rating used in conjunction with energy mortgages? - ANSWERS-the rating calculates the energy savings credited in the energy mortgage How much would the total duct leakage be obtained from house where two duct leakage tests were preformed on two separate HVAC systems? - ANSWERS-The results from each test are added together If a house is under a small neg. pressure (<3pa) wrt outside, which of the following health and safety issues are most to be a concern - ANSWERS-Entry of gas into the home If a residence shares a common wall ceiling or floor with another dwelling it is termed a: - ANSWERS-multi-family dwelling If backing is not added to the hot walls of a two-story house what grade of insulation would be given if the insulation inspection revealed a perfect installation job? - ANSWERS-grade 1 if the CFM50 after air sealing the building shell is too low, mechanical ventilation is either recommended or required depending on the leakage rate achieved. in this case what is the intended result of mechanical ventelation? - ANSWERS-To provide acceptable IAQ
if the rated home has a conditioned basement, which of the following is true about the reference home: - ANSWERS-It excludes a portion of the basement area from the floor area calculations used to determine amount of windows in HERS reference home, in the equation Q=C x delta P^ n, "C" is - ANSWERS-A Flow coeffecient In what decade did the use of most asbestos-based building products decline? - ANSWERS- 1970 - 1980 Knee walls are entered into the software separately because they are always: - ANSWERS-Have different temperature differences if a homeowner refuses to have an un-vented fireplace removed (or replaced with vented fireplace) how would work scope preparation be affected? - ANSWERS-the work scope can not include any measures that increase the air tightness of the building envelope, the work scope cannot include the installation of additional floor insulation one of the consequences of a tighter house is - ANSWERS-Moisture levels in the house may increase Quality assurance standards set by RESNET require what percentage a minimum of rater's building file is to be monitored? - ANSWERS- 10%
What is possible problem associated with an oversized air conditioner? - ANSWERS-*poor dehumidification *Short cycling *higher electric bills (all of the above) What is the effect of internal heat gain on system load sizing for heating? - ANSWERS-Load size increases What is the first priority when addressing an IAQ problem? - ANSWERS-Source Control What i sthe maximum loan amount for Fannie Mae EIM? - ANSWERS-The greater of 5% of the appraised value (limited to $8000) or $4000 and positive cash flow What is most likely negative health effect in a house having more supply side leaks than return leaks? - ANSWERS-Depressurization what is most likley R-value of a 2x4 wall cavity of a home constructed in 1978: - ANSWERS-R- 11 What must be true for a rating to be termed a "Confirmed" rating? - ANSWERS-the actual CFM50 number and the duct leakage of the house should be entered into software
What percentage of energy consumed by an incandescent light bulb actually goes to generating light? - ANSWERS-10% what person must accredit HERS provider have in order to preform quality assurance? - ANSWERS-A quality assurance designee
