90 Questions
Which of the following functions does HVAC stand for?
Heating Ventilation Air Conditioning
What is the main difference between a heat pump and a condenser in an HVAC system?
A heat pump is involved in both cooling and heating, while a condenser only cools the air
What is a central air conditioning unit also known as?
Ducted system
Which type of heating system uses thermal radiation and electromagnetic waves to heat a room by directly heating the floor instead of the air?
In-floor radiant heating
Which type of heating system uses solar energy to heat liquid or air, and can supplement forced-air systems?
Active solar heating
Which type of heating system combines an electric heat pump with a gas-powered furnace to maximize energy savings and system performance?
Hybrid heating
Which component of an HVAC system is responsible for exchanging stale air for fresh air, helping to keep the air inside your home clean?
Air exchanger
Which type of water heater operates on demand and only heats water as needed, saving energy and money?
Tankless/demand water heaters
Which type of water heater is 50% more efficient than gas or electric water heaters and uses solar power?
Solar water heating systems
Which type of water heater can be two to three times more efficient than conventional electrical water heaters, but can only be used in locations with milder climates?
Heat pump
What does NATE certification stand for?
North American Technician Excellence
Which principle did Archimedes discover while trying to find out if a goldsmith had committed fraud?
Buoyancy principle
What is the upward force on an object called?
Buoyancy
Who described the drop in air pressure above a hole when the velocity of the air blowing across the hole goes up?
Daniel Bernoulli
What does the combined gas law state?
The ratio between the pressure-volume product and the temperature of a system remain constant
What are the sources of heat gain from the outside in a building's envelope?
Exterior walls, windows, doors, attic kneewalls, and ceilings
How is the ventilation load of a home calculated?
Multiplying the number of occupants by 7.5 cubic feet minute (cfm) and adding 1 cfm per 100 ft2 of conditioned space
Which type of air conditioner is a combination of an outdoor unit comprising of a compressor & a condenser that comes along with one or more indoor units?
Ductless Mini-Split
Which type of air conditioner is designed for convenience if you prefer a mini-split but lack the required space for a wall mounted unit?
Floor Mounted Air Conditioner
Which type of air conditioner utilizes the insulating properties of the earth to heat and cool your home more efficiently?
Geothermal Air Conditioning System
Which of the following is NOT a type of heat energy transfer?
Pressure
What is the range of air temperature within the comfort zone for a single zone during the cooling season?
6°F
What is the range of air temperature within the comfort zone for a multi-zone design during the cooling season?
2°F
Which type of draft force is created by temperature differences in the vent connector of a natural draft combustion appliance?
Negative pressure
What type of appliance has a fan just inside or outside the wall at the point of termination?
Fan-assisted gas furnace
Where should the draft pressure be measured for a gas, natural draft, Category I appliance?
At the draft diverter (hood)
Which of the following is the correct definition of COas-measured?
COas-measured is the concentration of carbon monoxide in the air
What is COair-free in relation to carbon monoxide measurement?
COair-free is the adjusted (normalized) emission rate of carbon monoxide
When measuring indoor ambient air CO, how should it be read?
CO should be read as a concentration
What is the minimum width or height required for combustion air openings?
3 inches
What is the minimum net free area required for combustion air openings in the exterior wall?
1 square inch per 3,000 BTU/h
If the opening for combustion air is covered with a grille or louver, how should the size of the opening be adjusted?
Increase the size of the opening
According to the text, how should combustion air be drawn through vertical ducts in the floor and ceiling?
One duct through the floor to the vented crawlspace and one duct through the ceiling to the vented attic.
What is the minimum net free area of each opening for combustion air in the zone?
One square inch per 4,000 Btu/h of the total input of all the appliances in the zone.
According to the text, what should be taken into account when calculating the net free area of the duct openings?
Louvers, screens, or grilles.
According to the text, what percentage of total house energy loss can duct leakage account for?
25%
In many light commercial buildings, what is often the single largest cause of performance and comfort problems?
Duct leakage
What is one of the problems resulting from leaks in the return ductwork?
Reduced system efficiency and capacity
What is the purpose of the flexible extension duct?
To connect the Duct Blaster fan to the duct system
When should the flow conditioner be used?
When conducting a duct leakage test in the depressurization mode
What should be done to the HVAC system controls during the test?
Turn off the air handler fan
Which voltage specification is compatible with the standard Duct Blaster System sold in the United States?
110V AC power
What is the purpose of the Total Leakage Pressurization Test?
To measure the duct leakage rate in the entire duct system
What is the purpose of the fan control cable in the Duct Blaster System?
To automatically control the Duct Blaster fan using the DG-700's Cruise Control feature
Which component of an HVAC system is responsible for exchanging stale air for fresh air, helping to keep the air inside your home clean?
Ventilation system
What is the minimum net free area required for combustion air openings in the exterior wall?
1 square inch per 1,000 BTU/hr
Which type of water heater operates on demand and only heats water as needed, saving energy and money?
Tankless water heater
According to the text, how should combustion air be drawn through vertical ducts in the floor and ceiling?
Vertically downward
What is the impact of duct leakage to the inside of a house?
The energy efficiency penalty is much less significant
Which of the following setup options for connecting the Duct Blaster fan provides greater fan flow by reducing restrictions caused by the flex duct?
Setup Option 2: Connecting the Fan Without the Flexible Extension Duct
What is the purpose of the green tubing included with the Duct Blaster system?
To measure duct system pressure
When using a supply trunkline or supply plenum, how should the static pressure probe be installed for measuring duct pressure with the Duct Blaster system?
Insert the static pressure probe into the plenum pointing into the air stream
How should the red tubing be connected to the Duct Blaster fan?
Connect the red tubing to the brass pressure tap on the fan housing
Which of the following is the recommended location to install the Duct Blaster System for most duct testing applications?
Large central return
What is the purpose of open vents, access panels, or doors between unconditioned spaces and the outside during the test procedure?
To equalize pressure changes
What should be done if the Duct Blaster fan will be installed in an unconditioned space?
Use a flow conditioner in the round transition piece setup
What is the correct setup for conducting a pressurization test of the duct system using the Duct Blaster fan?
Fan housing resting on the floor or table, square transition piece connected to a central return grille or air handler cabinet access panel
Which type of blower door test requires the calculation of baseline pressure?
Both single-point and multi-point tests
What is the purpose of accounting for the difference in temperature between inside and outside the home during a blower door test?
To increase the accuracy of the test results
What is the main advantage of using automated software for a blower door test?
It provides more accurate test results
Which component of the blower door fan determines the air flow through the fan?
The flow sensor attached to the end of the motor
What is the purpose of the calibrated flow rings in the blower door fan system?
To measure the airflow rate over a wide range of flow rates
Where is the blower door frame typically installed in a building?
In an interior doorway of a large open room
During a baseline measurement, which channel displays a long-term average baseline pressure reading?
Channel A
What does Channel B display during a baseline measurement?
The elapsed measurement time in seconds
What is the purpose of the flow ring in the blower door fan?
To cover the fan inlet
How can the fan speed be adjusted using the DG-1000 gauge?
By touching and sliding the dot on the fan speed slider in the Gauge app
Which of the following is a technique for finding leaks in forced air ductwork using an infrared scanner with a blower door?
Performing two infrared scans from the interior of the building
What is the purpose of zone pressure diagnostics (ZPD) in weatherization professionals' efforts to prioritize airsealing in houses?
To estimate the amount of air leakage from attached zones
What is the purpose of using a pressure pan when looking for leaks in forced air ductwork?
To find leaks in the ductwork
What is the purpose of the Can't Reach 50 Factor in a one-point test during a blower door test?
To increase the maximum air flow available from the fan
Which of the following is true about the messages '-----' and 'LOW' appearing on Channel B in the Flow @ 50 mode?
The gauge cannot calculate a reliable leakage estimate when '-----' appears.
What should be done if the Channel B reads 'LOW' continuously or alternates with a flow reading?
Change the test device configuration to match the flow rate being measured.
What is the minimum number of pressure points required for a multi-point blower door test according to the ANSI/RESNET/ICC 380-2019 standard?
5
Which of the following is a recommended method for finding air leaks in a building using a blower door test?
Using your hand to feel for leaks while the blower door fan is running at a speed that generates between 20 and 30 Pascals of building pressure
What should be done to combustion appliances before conducting a blower door test?
Adjust all combustion appliances so they do not turn on during the test
What is the purpose of closing exterior doors and interior attic or crawlspace hatches during a blower door test?
To treat the entire building as one conditioned space and subject all leaks to the same pressure difference
What is the recommended method for checking for air leaks in a room using a blower door test?
Close the door most of the way, leaving about a one inch crack, and check for a large blast of air coming through the crack
Which of the following steps should be taken to attach the nylon panel to the frame and install it into the doorway?
Drape each side of the panel over the frame snugly and tighten the Velcro straps.
What should be done to the frame before running the green tubing outside and connecting it to the gauge?
Loosen all of the adjustment knobs.
Where should the blower door fan be inserted into the fabric panel?
Bottom first into the hole, with the guard facing outside and the flow rings facing inside.
How should the gauge mounting board be attached to a horizontal surface?
Rotating the clamp 90 degrees before securing the board.
Which equation is used to calculate the Energy Factor (EF) for a gas-fired water heater?
EF=0.9066 * UEF+0.0711
Which type of water heater has an Energy Factor (EF) estimation equation that can generate EFs greater than 1.0?
Consumer Electric Water Heater (Heat-Pump)
What is the purpose of the HERS Reference Home?
To provide a basis for comparison with the rated home
Which of the following is the official language of the United States?
English
Which of the following is the most widely spoken language in the world?
Mandarin Chinese
Which of the following best describes the concept of 'Normalized modified end use loads' mentioned in the text?
A process to model the energy consumption of a specific property
What is the purpose of normalizing internal gains, water usage, and temperature set points in the context of energy rating procedures?
To ensure consistency in energy rating evaluations
What does the term 'Fuel type is Neutral' mean in the given context?
The type of fuel used in a property does not affect the energy rating evaluation
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