RESNET HERS Rater Sample Test Questions 2

Transcription

1 RESNET HERS Rater Sample Test Questions 2 1. Which of the following is the best device for removing standing water from a crawl space? A. Dehumidifier B. Sump pump C. Air-to-air heat exchanger D. Crawl-space fan 2. Which of the following is true about common gas storage water heaters? A. They often have weak chimney draft B. Have standby losses of about 22% C. They are quite efficient at heating water D. They typically have 0.75 energy factor or higher 3. How many BTUs are required to heat a pound of water from 40 F to 70 F? A B. 100 C D Which of the following results from excessive cold-weather air leakage across the building enclosure? A. Furnace short-cycling B. Dry indoor air C. High indoor humidity D. Indoor air density increases 5. A return duct leak that is located in a garage is a health and safety concern because of which of the following? A. The return duct leak will introduce a significant quantity of moisture to the house B. The return duct leak could introduce pollutants that are commonly found in the garage to the house C. The return duct leak will cause the house to become depressurized with respect to outdoors when the air handling system is operating D. The return duct leak could cause a water heater that is located within the main body of the house to backdraft 6. When air sealing in a cold climate, where is the most effective area to seal? A. Attic plane B. Windows and doors C. Foundation walls D. Crawlspace walls 7. Which of the following could cause backdrafting of equipment in conditioned space? A. The operation of an adjacent, sealed combustion appliance B. A supply duct disconnected in an unconditioned, ventilated attic C. The operation of an adjacent, unvented combustion appliance D. A return duct disconnected in an unconditioned, ventilated attic 8. Which of the following may be considered to be a health and safety hazard? A. Excessive solar gain B. Vent free combustion appliance C. Electric hot water heaters D. Pilotless ignition devices 9. Which of the following is not a primary heat transfer mechanism? A. Radiation B. Insolation C. Convection

2 D. Conduction 10. Which of the following are certain drawbacks to oversizing a central air conditioning system? A. Lower efficiency B. Short cycling C. Poor dehumidification D. All of the above 11. What is the U-value of an R-3 window? A. 3.0 B C D SEER ratings for central air conditioning systems typically fall within which of the following ranges? A. 1 to 5 B. 5 to 12 C. 13 to 16 D. 15 to When you heat up a given volume of air, what happens to the quantity of water vapor it can hold? A. It increases B. It decreases C. It stays constant D. The amount of water vapor in the air will increase 14. Which of the following are required to perform heating and cooling load calculations? A. Window types and areas B. R-values of floor, ceiling and walls C. House orientation D. Estimate of infiltration rate E. All of the above 15. When conducting a duct blaster test, the best place to put the supply reference pressure probe is placed in A. A supply register far away from the air handler B. A supply register about halfway between the air handler and the longest duct runs C. The supply trunk D. It doesn't matter where you put it 16. A 200 square foot wall with an R-value of 12 has a 30 square foot window with a U-factor of 0.8. What is the approximate weighted R-value for this wall? A. 9 B. 5.3 C. 18 D A 100 square foot wall with an R-value of 10 has a 10 square foot window with a U-value of one. What is the approximate weighted R-value for this wall? A. 9 B. 5.4 C. 18 D What is the cooling load in Btu's per hour through a 100 sq ft wall with an R-value of 13 at an indoor temperature of 75F and outdoor temperature of 105F? A. 285 B. 390 C. 231

3 D. 1, When warm, humid air is cooled, which of the following is likely to occur? A. Evaporation B. Freezing C. Condensation D. Latent Heat 20. "Latent heat" refers to what? A. Invisible heat flow B. Air leaks that are hidden between the walls C. Energy required to condense or evaporate water vapor from the air D. None of the above 21. Calculate the CFM of air flow in a room that has 1000 cubic feet of volume, with an air change rate of 0.5 air changes/hour. A. 8.3 B C. 5.3 D The proper design temperature for heating or cooling loads is defined as? A. The most extreme temperature recorded within the last 20 years in a given town B. The temperature equaled or exceeded 97.5% of the time C. A high or low temperature used for designing a heating and cooling system D. Occurs less than 2.5% of the time E. B, C and D F. All of the above 23. When preparing for a blower door test, the base pressure reading is a measure of which pressure effects? A. Barometric and temperature effects B. Exhaust fans and wind C. Stack effect and wind D. Exhaust fans and stack effect 24. When preparing the house for the blower door leakage test, fireplace dampers should be placed in what position? A. Open B. Sealed shut C. Closed D. In whatever position the damper was found when the test began 25. During a blower door test, you can get the house pressure only to 40 Pascals. The flow rate at this house pressure is 5400 CFM. What should you do to determine the CFM at 50 Pascals? A. Multiply 5400 by the Can't Reach Fifty (CRF) factor for 50 Pascals B. Multiply 5400 by the Can't Reach Fifty (CRF) factor for 40 Pascals C. Reduce the size of the fan opening D. Successfully close off parts of the house until you can reach 50 Pascals 26. Which of the following is essential to determine whether duct leakage will pressurize or depressurize the main body of a house with reference to outside? A. Magnitude of duct leakage relative to whole house leakage B. Distribution of the leaks in the duct system C. Distribution of leaks with respect to the envelope air barrier and air handler D. Distribution of leaks with respect to the envelope air barrier 27. What would you do if you notice a bathroom exhaust fan is on while you are preparing a house for a blower door test? A. Close the bathroom door

4 B. Turn off the fan C. Tape the exhaust fan damper shut D. Do nothing because it is part of the natural air leakage of the house 28. What is CFM50? A. A measure of the building s ventilation rate B. The air exchange rate across a building envelope due to outdoor wind forces C. The air handler air flow rate that produces a duct pressure of 50 Pascals D. The air flow rate across a building enclosure when the building is pressurized or depressurized to 50 Pascals 29. What information do you get if you measure the change in pressure with reference to outdoors caused by activating the HVAC blower? A. Whether the air conditioning system has adequate air flow B. Whether the predominant leakage to outside is on the return or supply side of the air handler fan C. The leakiness of the building envelope D. Whether the duct system is adequately sized 30. When setting up a duct tester at a filter-backed return grill, the filter should be: A. Removed from the return grill B. Cleaned or replaced prior to testing C. Replaced with cardboard to prevent air from passing through D. Left as is 31. For the following floor plan, what is the area? 27-4 A square feet B square feet C square feet D square feet 32. For the previous floor plan, what is the perimeter? A. 239 linear feet B. 203 linear feet C. 218 linear feet D. 264 linear feet 33. Which construction document shows the "footprint" of a building? A. section B. elevation C. cutaway

5 D. floor plan 34a. A vaulted ceiling under a shed roof that has a 12:12 pitch. It encloses a room that measures 10 feet by 10 feet. What is the approximate area of the ceiling? A. 140 ft2 B. 100 ft2 C. 120 ft2 D. 144 ft2 34b. A vaulted ceiling under a shed roof that has a 4:12 pitch. It encloses a room that measures 10 feet by 10 feet. What is the approximate area of the ceiling? A. 234 ft2 B. 105 ft2 C. 117 ft2 D. 72 ft2 35. What does an elevation drawing show? a. Detailed view of the wall, ceiling and floor construction b. One side of a house as viewed from straight on c. Two or more walls as viewed from an angle d. The roof as viewed from above 36. Why must knee wall area always be calculated separately from exterior walls? a. Knee walls have different adjacent conditions b. Knee walls are shorter c. Knee walls have different area d. Knee walls have different insulation levels 37. According to the RESNET Standards for quality assurance, what minimum percentage of a rater's building files that must be reviewed annually by the rating provider's quality assurance designee? a. 10% b. 1% c. 5% d. 20% 38. According to RESNET standards, there are two choices of ratings. One is a confirmed rating. What is the other choice? a. Informational rating b. Verified rating c. Projected rating d. Rating based on plans 39. When conducting a HERS rating, what about the rated home and the corresponding "reference" home will always be the same? a. Site location b. Window orientation c. Amount of air leakage d. Air conditioner efficiency 40. According to RESNET Standards, what is the minimum mechanical ventilation rate than can be applied in a rating calculation for a 3 bedroom, 1300 square foot home? a. 36 CFM b. 43 CFM c. 60 CFM50 d. 130CFM

6 41. What must raters do to ensure that the customers and the public can be assured of receiving competent and reliable services from home energy raters? a. Raters must have a minimum of 5 ratings reviewed and approved by a RE5NET staff member b. Raters must receive a degree from a college or university c. Raters must commit to ongoing professional development and education d. Raters must present their clients with a summary of their professional and educational background 42. A HERS index includes an analysis of the energy use associated with which of the following appliances? a. Clothes washer b. Dishwasher c. Dryer d. Microwave 43. What is the heat flow in Btu/hour through the following assembly at a 40 degree Fahrenheit temperature difference: 100 square feet of the assembly have a U-factor of and 20 square feet have a U-factor of 0.32? a. 922 Btu/hr b. 305 Btu/hr c. 504 Btu/hr d Btu/hr 44. What is the formula for estimating the natural infiltration rate (ACHnat) of a home? a. ACHnat = CFM50 x Volume / 60 b. ACHnat = CFMnat x Volume / 60 c. ACHnat = area x delta T / U-factor d. ACHnat = CFMnat x 60/ Volume 45. What is the formula for ACH50? a. ACH50 = CFM50 x Volume / 60 b. ACH50 = CFM50 x 60/ Volume c. ACH50 = CFM50 / 60 x N d. ACH50 = CFM50 60/ N 46. A pump draws 175 watts, 9 hours a day, for a year. What is the annual cost of this electricity at $0.14 per kilo-watthour? a. $80, b. $8, c. $56.94 d. $ Wattage is the product of which two values? a. Ohms' volts b. Volts x Amperes c. Amperes x Resistance d. Current x Resistance 48. How should batt insulation be installed in a frame floor above unconditioned space? a. With a 1" gap between the insulation and the surface it is warming b. In contact with the bottom floor c. Resting on the drywall or other material at the bottom of the joists d. With a 12" gap at the perimeter to allow for rim joist inspection 49. Which of the following will happen when you add insulation to an attic? a. Decrease the U-factor of t he ceiling that is being insulated b. Increase the U-factor of the ceiling that is being insulated c. Decrease the R-factor of the ceiling that is being insulated d. Increase both the U-factor and R-value of the ceiling that is being insulated

7 50. Which home energy feature is typically found in building specifications? a. Building dimensions b. Insulation R-value c. Orientation d. Thermostat set point Answers 1. B 26. D 2. B 27. B 3. D 28. D 4. B 29. B 5. B 30. A 6. A 31. C 7. B 32. A 8. B 33. D 9. B 34. A 10. D 35. B 11. B 36. A 12. C 37. A 13. A 38. C 14. E 39. A 15. C 40. B 16. B 41. C 17. B 42. B 18. C 43. C 19. C 44. D 20. C 45. B 21. A 46. D 22. F 47. B 23. C 48. B 24. C 49. A 25. B 50. B