Unit 39 Test and Quiz Review
D
A digital combustion analyzer calculates which of the following? A. Carbon monoxide (CO) B. Oxygen (O2) C. Methane (CH4) D. Undiluted carbon monoxide (COAF)
C
A duct leakage test to the outdoors is much more meaningful test to the energy auditor than a total duct leakage because A. ducts that are run in enclosed spaces can't be tested B. duct leakage to the conditioned space adds to the HVACR system performance C. the leakage is directly related to wasted energy D. total duct leakage testing does not produce reliable results
A
A home that is classified as a "net zero" home A. has an index score of 0.0 B. has an Energy Star rating of 85 C. is completely off the grid D. has an index score of 100.0
C
A temporary flow of combustion by-products into the living space is called A. backdrafting B. condensing C. spillage D. reverse draft
C
A type of insulation that can be blown into walls to reduce air leakage, if blown into cracks, such as around windows and door frames is A. rigid foam insulation B. loose-fill insulation C. foam-in-place insulation D. rolls and batts insulation
B
A type of insulation that is typically more expensive than fiber insulation and has R-values that range from R-4 to R-6.5 per inch of thickness is _________________. A. rolls and batts B. rigid foam insulation C. foam-in-place insulation D. loose-fill insulation
B
A way to compare one home to another and to characterize their efficiency is to A. compare conditioned square footage B. use an energy index C. compare geographic locations D. compare heating costs
D
A(n) __________________ test can help determine how tight or leaky a home's building envelope is overall A. thermal bypass B. base load C. combustion D. blower door
B
Along with heat, perfect combustion of naturally gas will produce A. carbon dioxide and carbon monoxide B. carbon dioxide and water vapor C. carbon (soot), carbon monoxide, and oxygen D. carbon dioxide, water vapor, oxygen, and carbon (soot)
D
An induced-draft high-efficiency condensing furnace would be classified as A. Category I B. Category II C. Category III D. Category IV
A
An induced-draft mid efficiency furnace would be classified as A. Category I B. Category II C. Category III D. Category IV
D
As excess air decreases A. flame current will increase B. gas pressure increases C. dew point temperature decreases D. dew point temperature increases
B
As the percentage of O2 (excess air) in the flue gas increases, the furnace efficiency A. increases B. decreases C. stays constant D. is not affected
B
Cad cells, flame rectification, and thermocouples are all types of A. combustion test methods B. flame safeguard controls C. limit safety controls D. natural-draft vent systems
C
For complete combustion, approximately ______________ ft cubed are need for each 1 ft cubed of gas A. 5 B. 10 C. 15 D. 20
D
For more customized insulation recommendations, a ___________________ can provide insulation levels for new or existing homes A. Geographic Insulation Calculator tool B. Zone Insulation Calculator tool C. Manual J Load Calculation D. Zip Code Insulation Calculator tool
True
HERS Raters assign a score to each home. The lower the score, the more energy efficient the home is. True or False
D
High-efficiency, condensing, furnaces are typically rated at __________ AFUE A. 65% to 75% B. 78% to 80% C. 78% to 83% D. 87% to 97%
A
Home energy audits are environmentally beneficial because they ______________________. A. decrease environmental pollution B. identify structures that should be demolished C. decrease the number of gas-burning furnace in use D. require all refrigerants to be disposed of
A
In both new and existing homes, as much as _______% of the total energy losses can often be blamed on air leakage in forced-air duct systems A. 25 B. 35 C. 45 D. 55
A
In the Department of Energy climate zones 5, 6, 7, the standard air changes per hour for an Energy Star dwelling is A. 4 B. 10 C. 20 D. 50
B
Induced-draft systems have a combustion blower motor located A. at the inlet of the heat exchanger B. at the outlet of the heat exchanger C. above the dilution air device D. at the end of the flue pipe or top of the stack pipe
D
Intermediate zones are rooms or spaces that __________________ A. have walls that are conditioned on one side and unconditioned on the other B. are not designed for permanent occupancy C. are between thermal boundaries and thermal bypass zones D. are unintentionally conditioned
A
Mandatory requirements for air-sealing in new construction and additions are set by A. International Energy Conservation Energy (IECC) and the International Residential Code (IRC) B. Building Performance Institute (BPI) and Green Mechanical Council C. Environmental Protection Agency (EPA) D. National Fire Protection Association (NFPA)
A
Most U.S homes should have between ________________ insulation in the attic, including the attic trap or access door A. R-30 and R-60 B. R-20 and R-40 C. R-19 and R-13 D. R-15 and R-30
A
Net stack temperature is calculated by A. subtracting the combustion air temperature from the stack temperature B. adding the combustion air temperature to the stack temperature C. subtracting the stack temperature from the combustion air temperature D. dividing the stack temperature by the cubic feet of excess air
B
Of the two types of duct leaks, the one that has a larger impact on HVACR system performance is A. duct leakage to the conditioned space B. duct leakage to the outside C. cold air infiltration in the supply duct D. hot air infiltration in the supply duct
B
One safety concern that may arise when performing a blower door test that a technician must address is A. cold air may be drawn into the structure, causing condensation B. negative pressure may cause combustion appliances to backdraft C. heated air may be forced from the structure, causing the furnace to run longer D. negative pressure may cause the ductwork to collapse, causing airflow problems
C
Research has shown that the most serious air leaks occur A. through the HVACR system B. through the draft hood and fire places C. at the top and bottom of the conditioned envelope D. at the top of the conditioned envelope
A
Screening (visual inspections), diagnostic testing, and numerical analysis are three broad categories of A. a home energy audit B. air-sealing techniques C. duct testing and sealing D. a combustion analysis
A
Seasonal energy usages include A. only heating and cooling energy consumption B. base or LAMEL loads C. weather conditions D. heating, cooling, and base load energy usage
A
Some direct-vented high-efficiency furnaces need stronger combustion blower systems to overcome the additional pressure drop created by A. the sealed combustion chamber and combustion air pipe B. the secondary or condensing heat exchanger C. a dual-port air-proving or pressure switch D. the serpentine design of the primary and secondary heat exchangers
D
The U.S Department of Energy also says that a home's heating and cooling costs can be reduced by as much as 30% by A. replacing the structure's windows B. planting trees and vegetation to shade the property C. performing a combustion analysis on all gas-burning appliances D. using proper insulation and air-sealing techniques
B
The dew point temperature of undiluted flue gas is about A. 105 degrees F B. 140 degrees F C. 200 degrees F D. 400 degrees F
C
The dilution air device on an oil furnace or boiler is called a A. power-burner B. draft hood C. barometric damper D. combustion blower
B
The home energy audit can be divided into three broad categories: A. combustion analysis, diagnostic testing, and energy conservation measures B. screening, diagnostic testing, and numerical analysis C. energy conservation measures, screening, and numerical analysis D. indoor components, outdoor components, and mechanical systems
D
The ignition temperature of natural gas is A. 500 degrees F to 600 degrees F B. 700 degrees F to 800 degrees F C. 1500 degrees F to 1600 degrees F D. 1100 degrees F to 1200 degrees F
A
The leakage rate of the entire duct system is measured in A. cubic feet per minute (CFM) B. Pascals (Pa) C. air changes per hour (ACH) D. pounds per square inch (PSI)
D
The lower the HERS score A. the lower the home efficiency is B. the more ECMs are needed C. the more humid the climate is D. the more efficient the home is
D
The most popular energy index is the A. EPA index B. IECC index C. Energy star D. HERS index
C
The recommended pitch for the horizontal run of a flue pipe is A. 1/2 in per foot B. 1/2 in per 10 feet C. 1/4 in per foot D. 1/4 in per 10 feet
D
The standard for an Energy Star dwelling is ________ ACH at 50 Pascals for Department of Energy climate zones 5, 6, 7 A. 10 B. 8 C. 20 D. 4
B
The thermal resistance of the insulation and the surface area of the shell of the house will determine A. the type of heating and cooling equipment that should be installed B. how much heat is transmitted through the shell C. the square footage of the conditioned space being audited D. the emittance factor of the windows
B
Thermal boundaries consist of A. areas where are air can infiltrate or exfiltrate B. insulation and an air space barrier C. attics and crawl spaces D. thermal bypasses and intermediate zones
D
Thermal imaging cameras, often referred to as infrared cameras, create pictures by detecting A. reflected colors of the visible light spectrum B. motion of the object being imaged C. electromagnetic waves D. heat energy
D
To measure the total air leakage from a duct system A. a blower door test is done B. a smoke pen is used C. a thermal imaging test is done D. a duct blower test is done
C
When a blower door test is performed, the air leakage rate of the structure is determined by calculating A. the cfm of the blower door's fan at 20 Pascals (CFM 20) B. the emittance (low e) and reflectivity of the structure's window C. the number of air changes per hour at 50 Pascals (ACH50) D. the amount of air being passed through the shell by leaky ducts
C
When performing a duct leakage test, what pressure should be used A. 50 Pascals of positive pressure B. 25 psig of positive pressure C. 25 Pascals of positive pressure D. 25 Pascals of negative pressure
D
When performing diagnostic tests on a furnace as part of a residential energy audit, the airflow can be verified by testing the A. manifold gas pressure B. flue gas composition C. draft of the vent system D. temperature rise through the furnace
B
When testing for duct leakage to the outdoors A. a duct blower should be used B. both a blower door and a duct blower should be used C. a duct blower and thermal imager should be used D. a smoke pen and a thermal imager should be used
A
When the burner is off, no light is being generated and the resistance of the cad cell is about A. 100,000 ohms B. 10,000 ohms C. 1000 ohms D. 100 ohms
B
When the pressure of the combustion appliance zone (CAZ) is lower than the pressure of the vent system, ___________ will occur A. thermal bypass B. backdrafting C. condensation D. perfect combustion
B
When using a thermal imaging camera to inspect for thermal leaks, the recommended temperature difference from interior to exterior should be approximately A. 9 degrees F B. 18 degrees F C. 25 degrees F D. 30 degrees
A
Which of the following are base loads or LAMELs? A. Refrigerators, computers and water heaters B. Furnaces, boilers, and air conditioners C. Window, siding, and insulation D. Cordless drills, cell phones, and generators
A
Which of the following would be a cause of an air duct leak? A. A poor connection between a boot and the floor or wall B. An unsealed wall penetration around a plumbing fixture C. A floor slab that extends outdoors without a thermal barrier D. A penetration in the shell where TV cables enter the conditioned space
C
Which of the following would be a routine maintenance task that should be performed on heating equipment? A. Insulate the suction line B. Straighten fins on condenser and evaporator coils C. Perform a combustion analysis D. Caulk air leaks around window casings
C
Which of the following, present in the flue gas, is an indication of complete combustion? A. Carbon monoxide (CO) B. Oxygen (O2) C. Carbon dioxide (CO2) D. Undiluted carbon monoxide (COAF)
A
Yellow tips of a gas flame typically indicate the production of A. carbon monoxide B. heat C. carbon dioxide D. water vapor
D
____________ bring out many of the buildings "hidden unknowns" such as structural and ductwork air leakages A. Combustion tests B. Draft tests C. Thermal tests D. Diagnostic tests
C
______________________ is rapid heat being conducted through the residential structure's shell by materials in direct contact with one another that are very thermally conductive A. Thermal break B. Thermal bypassing C. Thermal bridging D. Rapid oxidation
