Energy Auditor Final Exam

What two building components dominate all solar gains and usually constitute over 90% of total solar gain

Roof and windows.
Roofs and walls.
Windows and walls.
Windows and foundations.

What is thermal bridging?

Rapid heat transfer through a heat conductor.
Materials installed between pieces of insulation.
Material used to repair heat exchangers.
Material used to repair heat exchangers.

In the formula, Q=U x A x Delta-T, what are the measurement units of Q?

BTUs per hour
Kilowatt hours
CFM
Heating degree days

What is the area -weighted average U-factor of an attic with 80% of the area insulated to R 40 and the other 20% to R 4

0.07
14.3
32.7
0.029

Which of these processes transfers heat from molecule to molecule in a solid substance?

Conduction.
Radiation.
Convection.
Condensation.

What term describes how the solar radiation and infrared radiation interacts with glass in a building?

The greenhouse effect.
Solar flaring.
Radiant diversion.
Convective radiation.

What is the heat released or absorbed during a phase change?

Latent heat
Sensible heat
Enthalpy
Condensation

In what direction will air always move without a fan?

From higher pressure to lower pressure.
From lower pressure to higher pressure.
From indoors to outdoors.
From outdoors to indoors.

What determines the airflow rate through an opening between two zones?

The hole size and the pressure difference between the zones.
The holes location and the velocity pressure.
The whole size and the friction rate.
The air turbulence and air velocity.

What is measured in pascals?

Air pressure
Air velocity
Airflow
Air resistance

What is the “stack effect”?

Air pressure caused by indoor-outdoor temperature differences.
Duct-induced pressure affects that move air through openings.
Air leakage caused by the wind.
Air leakage caused by air stagnation.

Which of these units measures electrical energy?

Kilowatt hours
Kilowatts
BTU/hours
Watts per hour

What two electrical quantities, multiplied together, produce watts?

Volts and amperes
Amperes and ohms
Volts and BTUs
Amps and Joules

If a power saw draws 3 amps at 120 volts, how many watts is the saw using?

360.0
123.0
40.0
60.0

What are the three main factors affecting winter heating energy consumption?

Heat transmission, air leakage, and heating efficiency.
Air leakage, ventilation, and combustion.
Heat exchange, heating efficiency, and window efficiency.
Roof insulation, air leakage, and ventilation.

What is the most important factor in determining summer cooling costs?

Solar gain
Heat transmission
Internal gains
Heat leakage

Which of these is NOT a important way for people to lose metabolic heat?

Conduction.
Convection.
Radiation.
Radiation.

Which of the following defines dew point most accurately?

Temperature where air is 100% relative humidity.
Absolute humidity of an air mass.
The point where humidity affects comfort.
The relative humidity where condensation forms on a cool object.

What is the area of a circle that has a diameter of 10 inches?

78.5 square inches.
31.4 square inches.
314 square inches.
3.14 square inches.

What is the volume of a room that is 12 feet wide, 24 feet long, and 8 feet high?

2304 cubic feet.
288 square feet.
2304 square feet.
576 cubic feet.

What is the outside surface area of a duct that is 6 inches in diameter and 10 feet long?

15.7 square feet.
188.4 square inches.
7.85 square feet.
720 square inches.

What result does this expression yield?: Q = U x A x HDD x 24

Annual heat transmission.
Heat loss rate.
Air leakage heat loss.
Sensible heat.

What are the measurement units of “q” when you solve this equation?: q = U x A x delta T

BTU per hour
BTUs
Therms
Degree days

What is the hypotenuse of a right triangle which has a base of 8 feet and a height of 6 feet?

10 feet.
100 feet.
48 feet.
14 feet.

How many therms of gas would you expect a family of four to use annually to heat water, using a gas storage water heater?

300 therms.
100 therms.
50 therms.
800 therms.

What accounts for the greatest share of washing-machine and dishwasher energy consumption in most residences?

Water heating.
Water pumps.
Motor operation.
Low-quality detergent.

What term describes heating and cooling energy?

Seasonal energy consumption.
Baseload energy consumption.
Annual space-conditioning cost.
Marginal energy cost.

What duct test gives the most useful prediction of savings opportunity from duct sealing?

Duct leakage to outdoors.
Pressure pan test.
Total duct leakage test.
Adjusted duct leakage test.

Which of these appliances typically uses the most energy annually?

Water heater.
Washing machine.
Toaster.
Kitchen range.

To what digital-manometer port is the fan of the duct blower connected?

Channel B input.
Channel A input.
Channel B reference.
Channel A reference.

What benefit does the pressure pan testing give you that the duct tester doesn’t?

Helps locate duct leaks.
Accurate reading or total duct leakage.
The pressure pan seals ducts as it measures air leakage.
There is no benefit to pressure pan compared to duct tester.

What would you conclude if the total leakage was 350 cfm25, and the leakage to outdoors was 60 cfm25?

The ducts are mostly within the pressure boundary or air barrier.
The ducts are mostly outside of the pressure boundary or air barrier.
The supply and return leaks are approximately equal.
The duct leaks are presenting a health and safety risk.

With the air handler operating, where would you find the highest positive pressure in the duct system?

In the supply plenum.
In the return plenum.
In the largest return grille.
In the closest supply register.

Which of the following is true about duct insulation?

It is usually cost-effective for any ducts in unconditioned spaces.
It is required for all ducts in conditioned spaces.
It is only necessary in severe climates.
It isn’t necessary on crawl-space supply ducts.

Why do supply duct leaks usually waste more energy than return duct leaks?

They leak conditioned air.
They’re bigger than return leaks.
They operate at a higher pressure.
They’re easier to seal.

How could duct leakage still waste energy if the duct system is completely inside the building envelope?

It causes zone pressure imbalances.
It slows the movement of air through the ducts.
It causes the filter to get clogged faster.
It makes the air handler run faster.

What location is Channel A’s reference port connected to for a depressurization test?

The outdoors
The attic
Fan housing
The indoors

Which of the following modes requires the user to enter the volume of the building?

ACH50
Fan pressure
Pressure/flow
Equivalent leakage area

Which of the following terms describes changing the size of the blower door’s orifice?

Configuration
Fan pressure
Device
Mode

Which manometer function allows us to control the units of measurement displayed on Channel B?

Mode
Device
Configuration
Range

A building has a blower-door measured ACH50 of 18. How would you describe this building?

Very leaky
Very tight
About average
Insufficient information to comment

If you blower-door test a 2400 square-foot house and measure 300 CFM50, what would you conclude?

The house is extremely tight.
The house is very leaky.
The house is about normal.
Not enough information provided to answer.

Which of these is the most relevant factor when sealing around chimneys?

Install both an air-seal and an insulation shield.
Leave a safety gap around the chimney.
Don’t interfere with the chimney’s operation.
Use flexible materials.

How are 90+% gas furnaces and boilers different from appliances with 80% efficiency?

They purposely condense water out of the combustion gases.
They have insulated double-wall chimneys.
They purify and ionize the gas before burning it.
They heat the heating fluid to a a very high temperature.

Which of these tests is the most direct verification that backdrafting is or isn’t happening?

Spillage test.
Draft test.
CO test.
Steady-state efficiency test.

What is the most serious safety problem caused by an wide-open return plenum on an atmospherically vented furnace?

Flame roll-out.
Air is stretched too thin for complete combustion.
Carbon dioxide leaks into the combustion zone.
Flue-gas spillage for more than 2 minutes.

What is the most important thing to verify during worst-case combustion appliance zone (CAZ) testing?

That combustion gases exit the home up the chimney.
That combustion-air openings are not plugged.
That the CAZ contains no negative pressure.
That dilution air is adequate to prevent CO.

What is the cooling coil in an air conditioner called?

The evaporator.
The compressor.
The condenser.
The choke coil.

What part of an air-conditioning system expels heat to outdoors?

Condenser.
Compressor.
Evaporator.
Rejecter.

What two building components should lie adjacent to each other at the thermal boundary of a building?

Insulation and air barrier.
Sheathing and insulation.
Insulation and weather-resistant barrier.
Insulation and vapor barrier.

What is the total U-factor of R19 fiberglass batts installed over a layer of R11 fiberglass batts?

0.033
0.14
0.33
0.059

If an insulation installer tells you that he is “dense-packing” wall cavities, what would you expect the density of the cellulose in those walls to be?

3.5 pcf
5.5 pcf
2.5 pcf
3.0 pcf

What is the least expensive type of foam board?

EPS
XPS
PIC
ROA

Which type of foam board has the lowest water absorption?

XPS
EPS
PIC
UPS

What type of foam do air sealers use to fill gaps around windows?

One-part polyurethane foam.
Two-part polystyrene foam.
Air-Krete foam.
High-density SPUF.

What is the most important window characteristic for hot climates?

Solar heat gain coefficient.
Visible transmittance.
Infrared transmittance.
U-factor.

What is the most dangerous of all the gases found in combustion byproducts?

Carbon monoxide.
Carbon dioxide.
Sulfur trioxide.
Nitrogen dioxide.

Which of these air pollutants is most likely to be related to an asthma attack?

Bioaerosols.
Lead dust.
Carbon dioxide.
Carbon monoxide

How do you determine if a ventilation fan is delivering the correct amount of air flow?

Measure the airflow.
Reference the ventilation table.
Use the formula.
Use the online calculator.

Which of the following is true about crawl-space ventilation in an air-conditioned home?

It encourages crawl space condensation during humid weather.
It is required by code with every crawl space.
It reduces crawl space condensation during humid weather.
It helps to reduce bulk water in the crawl space.

Why does a tankless water heater use less energy than a standard tank style?

It eliminates water-heating standby losses.
It heats water up to 50% faster.
It heats water up to 50% faster.
It is smaller.

What is the most important consideration when adding an external blanket to a gas water heater?

Insulate only the sides.
Insulate only the piping.
Insulate only the top.
Insulate only the top.

What is the recommended domestic hot water temperature at the fixture?

120º F
100º F
140º F
130º F

A 350 watt fan lamp for 13 hours. How many kilowatt-hours has the fan consumed?

4.55
45.5
4550.0
0.455

What range of refrigeration temperatures is appropriate for both food preservation and energy efficiency?

36°F to 40°F.
28°F to 32°F.
33°F to 36°F.
41°F to 44°F.

What range of freezer temperatures is appropriate for both food preservation and energy efficiency?

0°F to 5°F.
-25°F to -10°F.
-40°F to -25°F.
15°F to 25°F.

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