Residential Energy Audit - Chapter 6
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These questions are based on the following book: Residential Energy: Cost savings and comfort for existing buildings: Chapter 6 - Heating
- 1.A correctly sized heating system should:
- A.
Heat your home to your desired temperature within an hour.
- B.
Heat your home to your desired temperature within half an hour.
- C.
Heat your home at roughly the same rate it is being lost.
- 2.Room heaters deliver all their heat into ______ area. Central heaters convert fossil fuel or electricity to heat in a central location and use ducts or pipes to distribute the heat.
- 3.Efficiency =
- A.
Input/output
- B.
Output/input
- C.
Input*output
- 4.Generating electricity from coal or oil wastes about ___% of the fuel's potential energy.
- A.
12
- B.
25
- C.
50
- D.
70
- 5.Which of the quantities most accurately represent North America heating fuel usage the best?
- A.
Oil 50%, other 5% electricity 15%, Natural gas 30%
- B.
Oil 5%, other 50% electricity 15%, Natural gas 30%
- C.
Oil 9%, other 9% electricity 29%, Natural gas 53%
- D.
Oil 9%, other 9% electricity 53%, Natural gas 29%
- 6.In oil & gas heaters burners mix and burn feul in combustion chambers.
- A.
True
- B.
False
- 7.The ____________ surrounding the the combustion chamber, transfers heat from the flames and combustion gases to the heating fluid - air, water or steam.
- A.
Air
- B.
Heat exchanger
- C.
Insulation
- 8.The efficiency of a combustion heater depends on losses to:
- A.
Incomplete combustion, chimney losses
- B.
Losses at the beginning and end of the burner cycle
- C.
Distribution
- 9.Room heaters have no distribution losses.
- A.
True
- B.
False
- 10.Combustion is slow oxidation; oxygen combines with the carbon and hydrogen , splitting the hydrocarbon molecules
- A.
True
- B.
False
- 11.What are the main products of combustion?
- A.
Water vapor
- B.
Smoke
- C.
Hydrogen
- D.
Carbon dioxide
- 12.Some oxygen goes through combustion without reacting. The percentage of oxygen in _______ gases informs us about the fuel- air mixture.
- 13.Unreacted oxygen and unreacted nitrogen absorb heat from the combustion and carry it up the chimney.
- A.
True
- B.
False
- 14.6Open-combustion & closed-combustion describe whether the or not the combustion chamber, heat exchanger, flues and chimney are open to the ______________ air.
- 15.Older open combustion heaters also draw indoor air into their chimneys though dilution devices such as
- A.
Valves (oil & gas)
- B.
Draft diverter (gas)
- C.
Barometric draft control (oil)
- 16.Draft diverters are designed to prevent excessive updrafts and increase downdrafts.
- A.
True
- B.
False
- 17.In a open combustion heater, strong downdrafts may interfere with the burner or extinguish the pilot
- A.
True
- B.
False
- 18.Name the mechanism in open combustion oil heaters that adjust dilution air to maintain a consistent chimney draft.
- A.
Barometric draft control
- B.
Temperature draft control
- C.
Infrared draft control
- 19.Select the three common burner types:
- A.
Atmospheric
- B.
Radiant draft burners
- C.
Induced-draft burners
- D.
Power burners
- 20.Power burners use a blower to to move combustion gases through the combustion chamber,
- A.
True
- B.
False
- 21.Name the burner described by the following: An electric motor on the gun burner runs the blower and an oil pump, delivering the oil at a high pressure. The burner's nozzle spays the high-pressure oil into the combustion chamber where it is ignited by sparking electrodes.
- 22.What factors may influence the intensity of chimney draft?
- A.
Taller chimney
- B.
Hotter contents of the chimney
- C.
Lighter contents of the chimney
- 23.Factory build chimneys have multiple wall to
- A.
Allow for a rigid and durable construction.
- B.
Allow for better support
- C.
Allow for closer tolerance
- D.
Keep combustion gases warmer and avoid condensation in the chimney.
- 24.Type-B vent is widely used as gas =appliance chimney.
- A.
True
- B.
False
- 25.__ ______ is preferred for gas appliance chimney, vent connector for 80+ gas furnaces as well as the chimney liner whenever there is space inside a masonry chimney.
- 26.When should you reline a masonary chimney with a rigid or flexible chimney liner?
- A.
Never
- B.
When there is no chimney liner
- C.
When liner is deteriorated
- 27.Insulated double and triple wall chimneys can not be used as vertical chimneys for oil and solid fuel appliances.
- A.
True
- B.
False
- 28.Plastic pressurized condensing vents can only run vertically and not horizontally from the condensing appliance.
- A.
True
- B.
False
- 29.Which of the following are correct statements?
- A.
Fuel burning efficiency counts losses from incomplete combustion.
- B.
Steady state efficiency counts chimney losses
- C.
Annual fuel utilization efficiency counts cycling and jacket losses.
- D.
Seasonal efficiency counts distribution losses in addition to the above mentioned.
- E.
None of these are correct statements.
- 30.Fuel burning efficiency counts
- A.
Chimney losses.
- B.
Losses from incomplete combustion.
- C.
Distribution losses.
- 31.Steady state efficiency counts
- A.
Distribution losses.
- B.
Losses from incomplete combustion.
- C.
Chimney losses.
- 32.SSE is the percentage of heat captured by the heating fluids - air, water & steam.
- A.
True
- B.
False
- 33.SSE can not be measured with CO2- sensing devices.
- A.
True
- B.
False
- 34.AFUE accounts for
- A.
Fuel burning losses
- B.
Chimney losses
- C.
Cycling losses
- D.
Heat loss through a central heater's cabinet
- E.
Distribution losses
- 35.Which are the preferred dilution device today?
- A.
Draft diverter
- B.
Barometric draft control
- 36.Excess combustion air ensures complete combustion and avoids carbon monoxide production. Which of the following is also true about excess combustion air?
- A.
Excess combustion air cause a furnace to use energy very efficiently.
- B.
Excess combustion air cause a furnace to waste energy.
- C.
Excess air absorbs heat and carries it up the chimney.
- D.
Neither A, B or C is correct.
- 37.Cycling losses refers to:
- A.
Cycle time wasted because no set back thermostat was installed.
- B.
Every time the furnace or boiler cools down it partially looses the heat produced without warming up the house.
- C.
If air continue to circulates through the heat exchanger after the burners shut down, heat continues to flow into the building.
- 38.The amount of cycling losses depend on:
- A.
The size of the furnace
- B.
The number of cycles
- C.
The efficiency of the chemical reaction inside the combustion chamber
- D.
The amount of heat required to heat up the exchanger
- E.
The efficiency of the distribution system operating after the burners shut off.
- 39.Off cycle losses is more important with boilers than furnaces because ___________
- A.
Furnaces are AFUE certified
- B.
Boilers have a heavier heat exchanger and heating fluid.
- C.
Boilers lack behind in burner technology.
- 40.Distribution losses can be reclaimed in cases where the distribution system run trhough the heated space.
- A.
True
- B.
False
- 41.Correct sizing of a furnace or boiler is a very important measure to reduce cycle losses.
- A.
True
- B.
False
- 42.Heat escapes the distribution system mainly in the following ways:
- A.
Convection
- B.
Radiation
- C.
Conduction
- D.
Heating fluid escaping the from the ducts and pipes
- 43.What are the two most common problem found with combustion heater insdie a residence?
- A.
Maintenance is very expensive
- B.
Air pollution
- C.
Parts are hard to come by
- D.
Fire
- E.
Excessive humidity
- 44.Which of the foll wing gasses resulting from combustion heating affect our health?
- A.
Carbon monoxide
- B.
Nitrous oxide
- C.
Water vapor
- D.
Sulfur dioxide
- 45.How can carbon monoxide, nitrous oxide, water vapor and sulfur dioxide produced by combustion heating escape into our living spaces?
- A.
Cracked heat exchanger
- B.
Back drafting
- C.
Spillage
- 46.Intermittent ignition device (IIDs) can safe 3% to 5% of a furnace or boiler's fuel.
- A.
True
- B.
False
- 47.Thermocouple and the photocell are common safeguards. They prevent Oil, natiral gas or propane from accumulating in the combustion chamber. Name one more safegueard used in combustion heating.
- 48.Dryers, fireplaces, and exhaust fans can cause depressureization that could lead to _____________ - _____________.
- 49.Name three common causes for cracked heat exchangers.
- 50.Backdrafting can be caused by:
- A.
Blocked or poorly designed chimney.
- B.
High winds
- C.
Suction near the furnace or boiler
- 51.Back drafting may be eliminated by:
- A.
Repairing the chimney
- B.
Eliminating depressurization near the chimney
- C.
Providing outdoor combustion air
- D.
Replacing the atmospheric heater with a sealed-combustion or power-draft heater
- E.
Sealing leaky ducts
- 52.Colder temperatures produce___________ draft.
- A.
Higher
- B.
Lower
- C.
No
- 53.Chimney draft in atmospheric-draft appliances should be negative ________ pascals depending on the outdoor temperature.
- A.
1 to 5
- B.
5 to 7
- C.
5 to 10
- 54.During a worst case depressurization test while the exhaust fan and the furnace fan is running, the difference between the combustion zone and the outdoors should not exceed _________ pascals.
- A.
1 to 3
- B.
2 to 4
- C.
1 to 5
- D.
4 to 5
- 55.The combustion heater should not spill combustion gases from its dilution ddevice for longer than ________ seconds under worst case test conditions.
- A.
90
- B.
60
- C.
30
- 56.What is considered a confined space?
- A.
A room containing less than 100 cubic ft of volume for every 1000 BTU per hour of appliance input.
- B.
A room containing less than 1000 cubic ft of volume for every 1000 BTU per hour of appliance input.
- C.
A room containing less than 50 cubic ft of volume for every 1000 BTU per hour of appliance input.
- 57.What are considered practical combustion air alternatives for confined spaces?
- A.
Removing the combustion heating appliance from the confined space.
- B.
Passive combustion air can be supplied from adjacent indoor spaces to the confined space.
- C.
Installing combustion air vents lower down
- D.
Installing combustion air vents higher up
- E.
Installing sealed combustion , high efficiency furnaces and boilers.
- 58.Combustion-air vents located high on the walls can cause a stack effect that will depressurize the mechanical room by way of stack effect.
- A.
True
- B.
False
- 59.SSE is a good measurement of a heaters potential for improvement, or cost effectiveness of replacement.
- A.
True
- B.
False
- 60.During a SSE test combustion gases are sampled _______________________
- A.
Before they leave the heat exchanger.
- B.
Before they are diluted by the dilution device
- C.
After they are diluted by the dilution device.
- 61.During a SSE test, it is not desireable to see higher CO2 percantages because co2 is a sign of incomplete combustion.
- A.
True
- B.
False
- 62.When conducting a SSE test, which of the following results would desireable?
- A.
CO2 readings between 3% - 13%
- B.
Higher O2 Readings
- 63.Cost-effectiveness in replacing oil burners with an SSE over 75% rarely offer a good return on investment.
- A.
True
- B.
False
- 64.With a flame retention head oil berner (FRHOB) flue temperatures should never fall below 350 deg F because __________________
- A.
Efficiency will decrease
- B.
Flue gases could condense and cause corrosion.
- 65.Dirt & scale on the burner can cause incomplete combustion.
- A.
True
- B.
False
- 66.What is the main purpose of vent dampers?
- A.
Vent dampers prevent overheating and will shut down the burners if temperature over 575 deg F is detected
- B.
Vent dampers reduces heat loss by closing off the chimney during times when the furnes or boiler is not in operation.
- 67.Electric vent dampers for gas systems with a pilot light close completely and only opens 10% when the heating system is turned on.
- A.
True
- B.
False
- 68.Vent dampers benefit boilers more than they furnaces.
- A.
True
- B.
False
- 69.Forced air distribution sytems can waste energy in the following ways:
- A.
Air leaks into and out of ducts
- B.
The blower time too long
- C.
Obstructed airways
- D.
Uninsulated ducts in unconditioned spaces
- 70.Closing off registers in unused rooms often reduces airflow through the air handler and ducts, thereby reducung the system efficiency.
- A.
True
- B.
False
- 71.Overheating in furnaces can happen because of
- A.
Duct obstruction
- B.
Blower failure
- C.
Excessive fuel input
- D.
Back dratfing
- 72.Foil - or vinyl-faced fiberglass duct insulation fastens to sheet metal duct by various fastening systems including:
- A.
Welded or glued-on pins called stuck-ups or stick pins, with self locking washers.
- B.
Twine or wire wrapped around the insulation and duct then anchored to nearby wood joists.
- C.
Plastic cable ties.
- 73.When preventing air loss through the ducts systems, one should
- A.
Insulate with fiber glass insulation
- B.
Seal all seams with duct tape.
- C.
Be sure insulation wrap all the way around the duct
- D.
Use aluminum or vinyl tape to seal seams.
- E.
Ensure the end of each piece of tape should point downward; if it points upwards gravity will eventually pull it off.
- 74.Which of the following are considered solutions for duct airflow problems?
- A.
Cutting off interior doors to allow air to return from rooms, which have no return register.
- B.
Removing vents in doors or walls in room with no return register
- C.
Installing new return duct leading from a hard-to-heat area directly to the furnace cabinet
- D.
Installing new return duct leading from a hard-to-heat area directly to the existing return air ducts
- E.
Clean register, blowers and air conditioning coils.
- 75.Rooms may be hard to heat because of inadequate supply ducts or registers. Adding another supply duct and register is one option. Increasing the size of the existing duct and register is another.
- A.
True
- B.
False
- 76.In a steam heated system, which are the proper insulation type?
- A.
Foam
- B.
Fiberglass
- 77.In a steam heated system, why is fiberglass proper insulation type and not foam?
- A.
Fiberglass is more cost effective.
- B.
Foam has poor insulation characteristics.
- C.
Fiberglass is resistant to the high temperatures of steam pipes.
- 78.Cast iron sectional boilers, copper water tube boiler and steel fire tube boilers are the three most common boiler types in single-family and multi-family buildings.
- A.
True
- B.
False
- 79.Cast iron sectional boilers, copper water tube boiler and steel fire tube boilers are used for hot-water and steam heating systems.
- A.
True
- B.
False
- 80.Hot water boilers have an air space at their water vessel's top so that they can boil their water.
- A.
True
- B.
False
- 81.Steam boilers have an air space at their water vessel's top, called teh steam dome, where steam forms.
- A.
True
- B.
False
- 82.How are boilers protected from over damage caused by overheating?
- A.
High-limit pressure controls
- B.
Temperature controls
- C.
Boilers have no overheating protection
- 83.A common energy inefficiency factors for hot-water heaters are to heat water too hot and keep it hot for too long.
- A.
True
- B.
False
- 84.Why are boilers often over sized?
- A.
To facilitate the maximum amount of people than might be in the building at any given point.
- B.
To provide adequate heat during the coldest weather.
- 85.High efficiency furnaces and boilers have AFUEs of 80% to 97% , compared to conventional furnaces and boilers with AFUE's of 68% to 78%. The high efficiency furnaces and boilers contain a number of improvements over older models. These improvements include:
- A.
High efficient Pilot lights
- B.
Electronic ignition
- C.
Heat exchangers that restrict combustion gases, squeezing more heat out of them.
- D.
Fans that control combustion air through smaller flues.
- E.
Water condensed from flue gases in a corrosion resistant heat exchanger for higher efficiency
- 86.Match the following statement with one of the options below: A gas furnace rated AFUE 60+ and SSE 70+ will have these characteristics:
- A.
Category 1 chimney, draft diverter, no draft fan, standing pilot, non-condensing, indoor combustion and dilution air.
- B.
Category 1 chimney, no draft diverter, draft fan, electronic ignition, indoor combustion air, no dilution air
- C.
Category IV chimney, no draft diverter, draft fan, low-temperature plastic venting, positive draft, electronic ignition, condensing heat exchanger, outdoor combustion air is strongly recommended.
- 87.Match the following statement with one of the options below: A gas furnace rated AFUE 78+ and SSE 80+ will have these characteristics:
- A.
Category 1 chimney, no draft diverter, draft fan, electronic ignition, indoor combustion air, no dilution air
- B.
Category 1 chimney, draft diverter, no draft fan, standing pilot, non-condensing, indoor combustion and dilution air.
- C.
Category IV chimney, no draft diverter, draft fan, low-temperature plastic venting, positive draft, electronic ignition, condensing heat exchanger, outdoor combustion air is strongly recommended.
- 88.Match the following statement with one of the options below: A gas furnace rated AFUE 90+ and SSE 90+ will have these characteristics:
- A.
Category 1 chimney, draft diverter, no draft fan, standing pilot, non-condensing, indoor combustion and dilution air.
- B.
Category IV chimney, no draft diverter, draft fan, low-temperature plastic venting, positive draft, electronic ignition, condensing heat exchanger, outdoor combustion air is strongly recommended.
- C.
Category 1 chimney, no draft diverter, draft fan, electronic ignition, indoor combustion air, no dilution air
- 89.Unvented gas room heaters can deplete oxygen and produce unsafe quantities of CO, water vapor and oxides on nitrogen.
- A.
True
- B.
False
- 90.Safe use of unventilated gas room heaters do not require one or more wide-open windows.
- A.
True
- B.
False
- 91.Some wood stoves use catalytic converters that burn most of the unburned hydrocarbons from the fire.
- A.
True
- B.
False
- 92.Which of the following are true statements with regard to wood stoves?
- A.
Hot fires pollute less.
- B.
Feeding the stove more often helps efficiency.
- C.
Feeding the stove less often helps efficiency.
- D.
Smoldering minimizes emissions and minimizes fuel-burning.
- 93.Pellet stoves burn pelletized wood waste at lower efficiency than wood stoves.
- A.
True
- B.
False
- 94.Coal and oil generated electricity converts only about 30% of the fuel's potential energy to electricity. Which of the following is also true?
- A.
Electric heaters are 100% efficient
- B.
Electricity is a cleaner form of energy than gas or other fuels.
- C.
Electricity is more expensive than gas and other fuels
- 95.Which of the following describes liquid filled baseboard heaters.
- A.
Release heat in short bursts.
- B.
Release heat more evenly
- C.
Heating element rises to about 350 deg F
- D.
Element rises to only about 180 deg F
- 96.Characteristics of radiant heating includes
- A.
Radian panels can be turned on and off on a room by room bases - lowering energy costs.
- B.
Offer draft free heating
- C.
Possible excessive room temperature fluctuations
- D.
Insulation flaws does not effect radiant heating
- 97.Electric thermal storage does not save energy but does save money.
- A.
True
- B.
False
- 98.Electric zone heating is not a realistic option reducing the costs of heating in homes.
- A.
True
- B.
False
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