Residential Energy Audit - Chapter 6

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  • 1/98 Questions

    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.

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About This Quiz


These questions are based on the following book:
Residential Energy: Cost savings and comfort for existing buildings: Chapter 6 - Heating

Residential Energy Audit - Chapter 6 - Quiz

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  • 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.

    Explanation
    Room heaters deliver all their heat into a single area. This means that the heat produced by room heaters is concentrated in one specific space, such as a room or a small area, rather than being distributed throughout a larger area. Central heaters, on the other hand, distribute heat through ducts or pipes to multiple areas or rooms. Therefore, the correct answer is "one," "a single," or "1."

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  • 3. 

    Some oxygen goes through combustion without reacting. The percentage of oxygen in _______ gases informs us about the fuel- air mixture.

    Explanation
    The percentage of oxygen in flue gases informs us about the fuel-air mixture because flue gases are the byproduct of combustion. When fuel is burned, it reacts with oxygen to produce heat and flue gases. The presence of oxygen in the flue gases indicates that there is excess oxygen in the combustion process, suggesting a lean fuel-air mixture. By measuring the percentage of oxygen in flue gases, we can determine the efficiency of the combustion process and make adjustments to optimize the fuel-air mixture for better performance.

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  • 4. 

    6Open-combustion & closed-combustion describe whether the  or not the combustion chamber, heat exchanger, flues and chimney are open to the ______________ air.

    Explanation
    p139

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  • 5. 

    __ ______ 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.

  • 6. 

    Correct sizing of a furnace or boiler is a very important measure to reduce cycle losses.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The correct answer is true because properly sizing a furnace or boiler is crucial in order to minimize cycle losses. If the furnace or boiler is too small, it may not be able to meet the heating demands of the space, resulting in inefficient operation and increased energy consumption. On the other hand, if the furnace or boiler is too large, it will cycle on and off more frequently, leading to unnecessary energy waste and wear and tear on the equipment. Therefore, correct sizing is essential to ensure optimal efficiency and reduce energy losses.

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  • 7. 

    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.

    Correct Answer
    flame rectifier
    rectifier
    Explanation
    One more safeguard used in combustion heating is a flame rectifier. A flame rectifier is a device that detects the presence of a flame in the combustion chamber. It works by converting the AC signal generated by the flame into a DC signal, which can then be used by the control system to ensure that the flame is continuously present. This safeguard helps to ensure that the combustion process is functioning properly and that there is no risk of a buildup of oil, natural gas, or propane in the combustion chamber.

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  • 8. 

    Name three common causes for cracked heat exchangers.

    Correct Answer
    Rust
    excessive heat
    weld failure
    poor welding
    Explanation
    Rust can cause heat exchangers to crack due to corrosion and weakening of the metal. Excessive heat can lead to thermal stress and expansion, causing cracks to form. Weld failure can occur if the welding process is not done properly, resulting in weak points that may crack over time. Poor welding techniques can also create weak spots in the heat exchanger, making it more susceptible to cracking.

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  • 9. 

    With a flame retention head oil berner (FRHOB) flue temperatures should never fall below 350 deg F because __________________

    • Efficiency will decrease

    • Flue gases could condense and cause corrosion.

    Correct Answer
    A. Flue gases could condense and cause corrosion.
    Explanation
    With a flame retention head oil burner (FRHOB), the flue temperatures should never fall below 350 deg F because when the flue gases cool down and condense, it can lead to the formation of moisture and acids. These condensates can cause corrosion in the flue system, leading to potential damage and inefficiency. Therefore, maintaining a minimum flue temperature is crucial to prevent condensation and corrosion issues.

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  • 10. 

    What is the main purpose of vent dampers?

    • Vent dampers prevent overheating and will shut down the burners if temperature over 575 deg F is detected

    • Vent dampers reduces heat loss by closing off the chimney during times when the furnes or boiler is not in operation.

    Correct Answer
    A. Vent dampers reduces heat loss by closing off the chimney during times when the furnes or boiler is not in operation.
    Explanation
    p154

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  • 11. 

    Unvented gas room heaters can deplete oxygen and produce unsafe quantities of CO, water vapor and oxides on nitrogen.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Unvented gas room heaters can indeed deplete oxygen and produce unsafe quantities of carbon monoxide (CO), water vapor, and nitrogen oxides. This is because these heaters do not have a vent to remove the combustion byproducts outside, causing them to accumulate indoors. The depletion of oxygen can lead to suffocation, while the release of CO can be toxic and even fatal. Additionally, the presence of water vapor and nitrogen oxides can contribute to poor indoor air quality and respiratory issues. Therefore, it is important to exercise caution when using unvented gas room heaters.

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  • 12. 

    Intermittent ignition device (IIDs) can safe  3% to 5% of a furnace or boiler's fuel.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    An intermittent ignition device (IID) is designed to improve the fuel efficiency of a furnace or boiler by reducing unnecessary fuel consumption. By only igniting the fuel when it is needed, IIDs can save 3% to 5% of the fuel that would otherwise be wasted. This makes the statement "True" as it accurately reflects the fuel savings potential of IIDs.

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  • 13. 

    Combustion-air vents located high on the walls can cause a stack effect that will depressurize the mechanical room by way of stack effect.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    p149

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  • 14. 

    Dirt & scale on the burner can cause incomplete combustion.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    p154

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  • 15. 

    In oil & gas heaters burners mix and burn feul in combustion chambers.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In oil & gas heaters, burners are responsible for mixing and burning fuel in combustion chambers. This process generates heat, which is then used to warm the surrounding environment. Therefore, the statement "In oil & gas heaters burners mix and burn fuel in combustion chambers" is true.

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  • 16. 

    Room heaters have no distribution losses.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    p138

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  • 17. 

    Insulated double and triple wall chimneys can not be used as vertical chimneys for oil and solid fuel appliances.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Insulated double and triple wall chimneys can be used as vertical chimneys for oil and solid fuel appliances.

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  • 18. 

    Distribution losses can be reclaimed in cases where the distribution system run trhough the heated space.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In cases where the distribution system runs through the heated space, distribution losses can be reclaimed. This means that the energy lost during the distribution of power can be recovered or reused in some way. By running the distribution system through the heated space, the heat generated as a result of energy loss can be captured and utilized, resulting in energy efficiency and cost savings. Therefore, the statement "Distribution losses can be reclaimed in cases where the distribution system runs through the heated space" is true.

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  • 19. 

    When conducting a SSE test, which of the following results would desireable?

    • CO2 readings between 3% - 13%

    • Higher O2 Readings

    Correct Answer
    A. CO2 readings between 3% - 13%
    Explanation
    A desirable result when conducting a SSE test would be CO2 readings between 3% - 13%. This range indicates a proper level of carbon dioxide in the environment, ensuring that there is sufficient ventilation and the air quality is safe. Higher O2 readings are not mentioned in the question, so it is unclear whether they are desirable or not.

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  • 20. 

    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.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    p161

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  • 21. 

    Steam boilers have an air space at their water vessel's top, called teh steam dome,  where steam forms.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Steam boilers have an air space at their water vessel's top, called the steam dome, where steam forms. This statement is true. The steam dome is a space located at the top of the boiler's water vessel, where steam accumulates before being released through the steam outlet. It helps to separate the steam from the water and ensures that only dry steam is delivered to the system. This design feature is important for the efficient and safe operation of steam boilers.

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  • 22. 

    Match the following statement with one of the options below: A gas furnace rated AFUE 60+ and SSE 70+ will have these characteristics:

    • Category 1 chimney, draft diverter, no draft fan, standing pilot, non-condensing, indoor combustion and dilution air.

    • Category 1 chimney, no draft diverter, draft fan, electronic ignition, indoor combustion air, no dilution air

    • 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.

    Correct Answer
    A. Category 1 chimney, draft diverter, no draft fan, standing pilot, non-condensing, indoor combustion and dilution air.
    Explanation
    The gas furnace rated AFUE 60+ and SSE 70+ will have a category 1 chimney, draft diverter, no draft fan, standing pilot, non-condensing, indoor combustion and dilution air. This means that the furnace will require a traditional chimney for venting, it will have a draft diverter to regulate the flow of combustion gases, there will be no draft fan to assist with venting, a standing pilot light will be used for ignition, it will not be a condensing furnace, and it will draw combustion air from inside the building with the help of dilution air.

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  • 23. 

    Some wood stoves use catalytic converters that burn most of the unburned hydrocarbons from the fire.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Some wood stoves are equipped with catalytic converters that help burn the majority of the unburned hydrocarbons produced by the fire. These catalytic converters are designed to increase the efficiency of the wood stove by promoting the combustion of these hydrocarbons, reducing emissions and improving air quality. Therefore, the statement that some wood stoves use catalytic converters to burn most of the unburned hydrocarbons from the fire is true.

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  • 24. 

    A correctly sized heating system should:

    • Heat your home to your desired temperature within an hour.

    • Heat your home to your desired temperature within half an hour.

    • Heat your home at roughly the same rate it is being lost.

    Correct Answer
    A. Heat your home at roughly the same rate it is being lost.
    Explanation
    A correctly sized heating system should heat your home at roughly the same rate it is being lost. This means that the heating system should be able to maintain a constant temperature in your home by supplying enough heat to offset the heat loss through walls, windows, and other sources. If the heating system heats your home too quickly, it may result in overheating and unnecessary energy consumption. On the other hand, if the heating system is too small and cannot keep up with the heat loss, it will struggle to maintain a comfortable temperature. Therefore, the ideal heating system should be able to balance the heat input with the heat loss to ensure efficient and effective heating.

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  • 25. 

    Which of the quantities most accurately represent North America heating fuel usage the best?

    • Oil 50%, other 5% electricity 15%, Natural gas 30%

    • Oil 5%, other 50% electricity 15%, Natural gas 30%

    • Oil 9%, other 9% electricity 29%, Natural gas 53%

    • Oil 9%, other 9% electricity 53%, Natural gas 29%

    Correct Answer
    A. Oil 9%, other 9% electricity 29%, Natural gas 53%
    Explanation
    The answer "oil 9%, other 9% electricity 29%, Natural gas 53%" most accurately represents North America heating fuel usage because it shows that the majority of the heating fuel used in North America is natural gas (53%), followed by electricity (29%), and then oil and other sources (9% each). This distribution of fuel usage suggests that natural gas is the primary source of heating fuel in North America.

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  • 26. 

    The ____________ surrounding the the combustion chamber, transfers heat from the flames and combustion gases to the heating fluid - air, water or steam.

    • Air

    • Heat exchanger

    • Insulation

    Correct Answer
    A. Heat exchanger
    Explanation
    A heat exchanger is a device that transfers heat from one fluid to another. In this case, the heat exchanger surrounding the combustion chamber transfers heat from the flames and combustion gases to the heating fluid, which can be air, water, or steam. This allows the heat generated by the combustion process to be effectively transferred and utilized for heating purposes.

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  • 27. 

    Unreacted oxygen and unreacted nitrogen absorb heat from the combustion and carry it up the chimney.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During combustion, oxygen and nitrogen are present in the air. When the fuel is burned, these gases do not completely react and some of them remain unreacted. These unreacted gases, particularly oxygen and nitrogen, absorb heat from the combustion process. As a result, they carry this heat up the chimney, aiding in the process of heat transfer. Therefore, the statement that unreacted oxygen and nitrogen absorb heat from the combustion and carry it up the chimney is true.

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  • 28. 

    In a open combustion heater, strong downdrafts may interfere with the burner or extinguish the pilot

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In an open combustion heater, strong downdrafts can disrupt the burner or even extinguish the pilot flame. This happens because downdrafts create a strong downward flow of air that can interfere with the proper functioning of the burner, affecting the combustion process. The pilot flame, which is responsible for igniting the main burner, can also be extinguished by these strong downdrafts. This can lead to inefficient heating or a complete shutdown of the heater. Therefore, the statement "True" accurately reflects the potential issues caused by strong downdrafts in an open combustion heater.

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  • 29. 

    Power burners use a blower to  to move combustion gases through the combustion chamber,

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Power burners use a blower to move combustion gases through the combustion chamber. This means that the blower creates airflow that helps in the movement of the combustion gases, ensuring efficient combustion. Without the blower, the combustion gases may not be properly circulated, leading to incomplete combustion and reduced efficiency. Therefore, the statement is true.

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  • 30. 

    SSE is the percentage of heat captured by the heating fluids - air, water & steam.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    SSE stands for System Seasonal Efficiency, which is a measure of how efficiently a heating system captures and utilizes heat. It takes into account the heat captured by the heating fluids such as air, water, and steam. Therefore, the statement that SSE is the percentage of heat captured by the heating fluids is true.

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  • 31. 

    Chimney draft in atmospheric-draft appliances should be negative ________ pascals depending on the outdoor temperature.

    • 1 to 5

    • 5 to 7

    • 5 to 10

    Correct Answer
    A. 1 to 5
    Explanation
    In atmospheric-draft appliances, the chimney draft should be negative to ensure proper ventilation and combustion. The negative pressure helps to draw the combustion gases out of the appliance and expel them safely through the chimney. The range of 1 to 5 pascals is considered suitable for this purpose, as it allows for efficient operation of the appliance while preventing the backflow of gases into the living space. This range may vary depending on the outdoor temperature, as colder temperatures can affect the draft.

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  • 32. 

    SSE is a good measurement of a heaters potential for improvement, or cost effectiveness of replacement. 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    SSE, or Seasonal Energy Efficiency, is a measurement that determines a heater's potential for improvement or cost effectiveness of replacement. A higher SSE value indicates that the heater is more efficient and will result in lower energy costs. Therefore, if a heater has a good SSE, it means that it has a high potential for improvement and is cost-effective to replace. Hence, the statement "SSE is a good measurement of a heater's potential for improvement or cost effectiveness of replacement" is true.

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  • 33. 

    During a SSE test combustion gases are sampled _______________________

    • Before they leave the heat exchanger.

    • Before they are diluted by the dilution device

    • After they are diluted by the dilution device.

    Correct Answer
    A. Before they are diluted by the dilution device
    Explanation
    During a SSE test, combustion gases are sampled before they are diluted by the dilution device. This is because sampling the gases before dilution provides a more accurate measurement of the actual combustion process and allows for better analysis of the emissions. Sampling after dilution may not provide an accurate representation of the true emissions, as the dilution process can alter the composition of the gases. Therefore, sampling before dilution is necessary to obtain reliable data for evaluating the performance of the combustion system.

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  • 34. 

    In a steam heated system, why is fiberglass proper insulation type and not foam?

    • Fiberglass is more cost effective.

    • Foam has poor insulation characteristics.

    • Fiberglass is resistant to the high temperatures of steam pipes.

    Correct Answer
    A. Fiberglass is resistant to the high temperatures of steam pipes.
    Explanation
    Fiberglass is the proper insulation type for a steam heated system because it is resistant to the high temperatures of steam pipes. This means that it can withstand the heat and prevent it from escaping, effectively insulating the system. Foam, on the other hand, has poor insulation characteristics and may not be able to withstand the high temperatures of the steam, leading to heat loss and inefficiency. Additionally, the cost-effectiveness of fiberglass may also be a factor in choosing it as the proper insulation type.

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  • 35. 

    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.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because cast iron sectional boilers, copper water tube boilers, and steel fire tube boilers are indeed the three most common boiler types in both single-family and multi-family buildings. These types of boilers are widely used due to their efficiency, durability, and ability to meet the heating needs of residential buildings.

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  • 36. 

    Combustion is slow oxidation; oxygen combines with the carbon  and hydrogen , splitting the hydrocarbon molecules

    • True

    • False

    Correct Answer
    A. False
    Explanation
    fast oxidation, p138

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  • 37. 

    Draft diverters are designed to prevent excessive updrafts and increase downdrafts.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    divert downdrafts p 139

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  • 38. 

    Name the mechanism in open combustion oil heaters that adjust dilution air to maintain a consistent chimney draft.

    • Barometric draft control

    • Temperature draft control

    • Infrared draft control

    Correct Answer
    A. Barometric draft control
    Explanation
    p139

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  • 39. 

    Type-B vent is widely used as gas =appliance chimney.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    p142

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  • 40. 

    Plastic pressurized condensing vents can only run vertically and not horizontally from the condensing appliance.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Plastic pressurized condensing vents can actually run both vertically and horizontally from the condensing appliance. This is because plastic vents are designed to handle the high temperatures and pressures generated by the appliance. Therefore, the statement that plastic pressurized condensing vents can only run vertically is incorrect.

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  • 41. 

    Fuel burning efficiency counts

    • Chimney losses.

    • Losses from incomplete combustion.

    • Distribution losses.

    Correct Answer
    A. Losses from incomplete combustion.
    Explanation
    Incomplete combustion refers to the process in which fuel does not burn completely, resulting in the production of harmful byproducts such as carbon monoxide and soot. These byproducts are released into the atmosphere, contributing to air pollution and reducing the overall efficiency of the burning process. Therefore, losses from incomplete combustion are a significant factor to consider when evaluating the fuel burning efficiency. Chimney losses and distribution losses may also impact efficiency, but in this context, the focus is on the specific losses caused by incomplete combustion.

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  • 42. 

    Which are the preferred dilution device today?

    • Draft diverter

    • Barometric draft control

    Correct Answer
    A. Barometric draft control
    Explanation
    p145

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  • 43. 

    Off cycle losses is more important with boilers than furnaces because ___________

    • Furnaces are AFUE certified

    • Boilers have a heavier heat exchanger and heating fluid.

    • Boilers lack behind in burner technology.

    Correct Answer
    A. Boilers have a heavier heat exchanger and heating fluid.
    Explanation
    p146

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  • 44. 

    How can carbon monoxide, nitrous oxide, water vapor and sulfur dioxide produced by combustion heating escape into our living spaces?

    • Cracked heat exchanger

    • Back drafting

    • Spillage

    Correct Answer(s)
    A. Cracked heat exchanger
    A. Back drafting
    A. Spillage
    Explanation
    p147

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  • 45. 

    Cast iron sectional boilers, copper water tube boiler and steel fire tube boilers are used for hot-water and steam heating systems.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because cast iron sectional boilers, copper water tube boilers, and steel fire tube boilers are commonly used for hot-water and steam heating systems. These types of boilers are designed to efficiently generate and distribute heat, making them suitable for both residential and commercial heating applications. Cast iron sectional boilers are known for their durability and long lifespan, while copper water tube boilers offer excellent heat transfer properties. Steel fire tube boilers are widely used due to their cost-effectiveness and ability to handle high-pressure steam.

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  • 46. 

    Safe use of unventilated gas room heaters do not require one or more wide-open windows.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because the safe use of unventilated gas room heaters actually requires one or more wide-open windows. Unventilated gas room heaters produce carbon monoxide, which is a toxic gas. Without proper ventilation, carbon monoxide can accumulate in the room and pose a serious health risk. Opening windows allows fresh air to enter the room and helps to remove the carbon monoxide, ensuring safe use of the heater.

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  • 47. 

    Closing off registers in unused rooms often reduces airflow through the air handler and ducts, thereby reducung the system efficiency.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Closing off registers in unused rooms reduces the airflow through the air handler and ducts. This reduction in airflow can lead to a decrease in system efficiency. When registers are closed, the air pressure in the ducts increases, causing the air handler to work harder to push air through the system. This can result in increased energy consumption and reduced overall efficiency of the HVAC system. Therefore, it is true that closing off registers in unused rooms can reduce system efficiency.

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  • 48. 

    Efficiency =

    • Input/output

    • Output/input

    • Input*output

    Correct Answer
    A. Output/input
    Explanation
    The efficiency is calculated by dividing the output by the input. This ratio represents how effectively the input is being utilized to produce the desired output. A higher value indicates a more efficient system, as it indicates that a greater output is being achieved with a given input. Therefore, the correct answer is output divided by input.

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  • 49. 

    Generating electricity from coal or oil wastes about ___% of the fuel's potential energy.

    • 12

    • 25

    • 50

    • 70

    Correct Answer
    A. 70
    Explanation
    Generating electricity from coal or oil wastes about 70% of the fuel's potential energy. This is due to the inefficiency of the conversion process, where a significant amount of energy is lost as heat. Only a fraction of the fuel's energy is actually converted into useful electricity, while the rest is released as waste heat into the environment. This highlights the need for more efficient and sustainable methods of generating electricity to minimize energy waste and reduce environmental impact.

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