Residential Energy Audit - Chapter 6

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Residential Energy Audit - Chapter 6 - Quiz


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


Questions and Answers
  • 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.

    Correct Answer
    C. 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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  • 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.

    Correct Answer
    one
    a single
    1
    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. 

    Efficiency =

    • A.

      Input/output

    • B.

      Output/input

    • C.

      Input*output

    Correct Answer
    B. 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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  • 4. 

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

    • A.

      12

    • B.

      25

    • C.

      50

    • D.

      70

    Correct Answer
    D. 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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  • 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%

    Correct Answer
    C. 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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  • 6. 

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

    • A.

      True

    • B.

      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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  • 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

    Correct Answer
    B. 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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  • 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

    Correct Answer(s)
    A. Incomplete combustion, chimney losses
    B. Losses at the beginning and end of the burner cycle
    C. Distribution
    Explanation
    The efficiency of a combustion heater is determined by the losses it experiences during operation. These losses include incomplete combustion, which refers to the combustion process not being fully completed and resulting in wasted fuel. Chimney losses occur when heat escapes through the chimney instead of being utilized. Additionally, losses at the beginning and end of the burner cycle refer to inefficiencies during the startup and shutdown phases. Lastly, distribution losses refer to heat being lost during the transfer of heat from the heater to the desired space.

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  • 9. 

    Room heaters have no distribution losses.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    p138

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  • 10. 

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

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    fast oxidation, p138

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  • 11. 

    What are the main products  of combustion?

    • A.

      Water vapor

    • B.

      Smoke

    • C.

      Hydrogen

    • D.

      Carbon dioxide

    Correct Answer(s)
    A. Water vapor
    D. Carbon dioxide
    Explanation
    The main products of combustion are water vapor and carbon dioxide. During the process of combustion, a fuel combines with oxygen to produce heat and light. Incomplete combustion can result in the production of smoke and other byproducts, but in complete combustion, water vapor and carbon dioxide are the primary outputs. Water vapor is formed when hydrogen from the fuel combines with oxygen, while carbon dioxide is produced when carbon from the fuel combines with oxygen.

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  • 12. 

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

    Correct Answer(s)
    flue
    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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  • 13. 

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

    • A.

      True

    • B.

      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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  • 14. 

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

    Correct Answer
    surrounding
    Explanation
    p139

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  • 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)

    Correct Answer(s)
    B. Draft diverter (gas)
    C. Barometric draft control (oil)
    Explanation
    p139

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  • 16. 

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

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    divert downdrafts p 139

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  • 17. 

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

    • A.

      True

    • B.

      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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  • 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

    Correct Answer
    A. Barometric draft control
    Explanation
    p139

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  • 19. 

    Select the three common burner types:

    • A.

      Atmospheric

    • B.

      Radiant draft burners

    • C.

      Induced-draft burners

    • D.

      Power burners

    Correct Answer(s)
    A. Atmospheric
    C. Induced-draft burners
    D. Power burners
    Explanation
    The three common burner types are atmospheric, induced-draft burners, and power burners. Atmospheric burners rely on natural air flow for combustion, while induced-draft burners use a fan to create a draft for combustion. Power burners have a forced air system to provide combustion air. These three types of burners are commonly used in various heating systems and have different mechanisms for achieving combustion.

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  • 20. 

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

    • A.

      True

    • B.

      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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  • 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.

    Correct Answer
    Explanation
    The burner described in the question is an oil gun burner. It is powered by an electric motor that operates the blower and oil pump. The oil is delivered at a high pressure and sprayed into the combustion chamber through a nozzle. The sparking electrodes then ignite the oil, resulting in combustion.

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  • 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

    Correct Answer(s)
    A. Taller chimney
    B. Hotter contents of the chimney
    C. Lighter contents of the chimney
    Explanation
    The intensity of chimney draft can be influenced by several factors. A taller chimney creates a greater pressure difference between the inside and outside of the chimney, which increases the draft. Hotter contents of the chimney also increase the draft, as the warm air rises more rapidly, creating a stronger upward flow. Additionally, lighter contents of the chimney, such as gases or smoke, contribute to a stronger draft because they are less dense and therefore more easily displaced by the surrounding air.

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  • 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.

    Correct Answer(s)
    C. Allow for closer tolerance
    D. Keep combustion gases warmer and avoid condensation in the chimney.
    Explanation
    Factory build chimneys have multiple walls to allow for closer tolerance, keep combustion gases warmer, and avoid condensation in the chimney. The multiple walls create a barrier between the hot combustion gases and the outer environment, preventing heat loss and maintaining higher temperatures inside the chimney. This helps to avoid condensation of the gases, which can lead to corrosion and damage to the chimney structure. Additionally, the multiple walls provide better support and contribute to a rigid and durable construction, ensuring the chimney's stability and longevity.

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  • 24. 

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

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    p142

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  • 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.

    Correct Answer
    b vent
    b-vent
  • 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

    Correct Answer(s)
    B. When there is no chimney liner
    C. When liner is deteriorated
    Explanation
    A masonry chimney should be relined with a rigid or flexible chimney liner when there is no chimney liner or when the existing liner is deteriorated. This is necessary to ensure proper ventilation and prevent potential hazards such as leaks, chimney fires, or carbon monoxide poisoning. Without a liner or with a deteriorated liner, the chimney may not effectively contain and remove the byproducts of combustion, leading to safety risks. Therefore, relining the chimney with a suitable liner is essential in these situations.

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  • 27. 

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

    • A.

      True

    • B.

      False

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

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  • 28. 

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

    • A.

      True

    • B.

      False

    Correct Answer
    B. 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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  • 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.

    Correct Answer(s)
    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.
    Explanation
    The correct answer includes all the statements mentioned in the question. Fuel burning efficiency counts losses from incomplete combustion, steady state efficiency counts chimney losses, annual fuel utilization efficiency counts cycling and jacket losses, and seasonal efficiency counts distribution losses in addition to the above mentioned.

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  • 30. 

    Fuel burning efficiency counts

    • A.

      Chimney losses.

    • B.

      Losses from incomplete combustion.

    • C.

      Distribution losses.

    Correct Answer
    B. 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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  • 31. 

    Steady state efficiency counts

    • A.

      Distribution losses.

    • B.

      Losses from incomplete combustion.

    • C.

      Chimney losses.

    Correct Answer
    C. Chimney losses.
    Explanation
    The term "steady state efficiency" refers to the efficiency of a system when it is operating at a constant, steady rate. In this context, "chimney losses" likely refers to the heat or energy that is lost through the chimney during the steady state operation of a system. This means that the efficiency of the system is affected by the energy that is lost through the chimney, which makes it an important factor to consider when assessing the overall efficiency of the system.

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  • 32. 

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

    • A.

      True

    • B.

      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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  • 33. 

    SSE can not be measured with CO2- sensing devices.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    SSE, or Specific Sensitivity to Ethanol, cannot be measured with CO2-sensing devices. This is because CO2-sensing devices are designed to measure carbon dioxide levels, not ethanol levels. Ethanol is a different compound and requires specific sensors or devices to accurately measure its concentration. Therefore, the statement is false.

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  • 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

    Correct Answer(s)
    A. Fuel burning losses
    B. Chimney losses
    C. Cycling losses
    D. Heat loss through a central heater's cabinet
    Explanation
    AFUE stands for Annual Fuel Utilization Efficiency, which is a measure of how efficiently a heating system converts fuel into usable heat over the course of a year. The given answer includes the factors that AFUE takes into account. Fuel burning losses refer to the energy lost during the combustion process. Chimney losses refer to the heat lost through the flue or chimney. Cycling losses refer to the energy lost when the heating system turns on and off frequently. Heat loss through a central heater's cabinet refers to energy lost due to poor insulation or leakage in the system. These factors are all considered in calculating the AFUE of a heating system.

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  • 35. 

    Which are the preferred dilution device today?

    • A.

      Draft diverter

    • B.

      Barometric draft control

    Correct Answer
    B. Barometric draft control
    Explanation
    p145

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  • 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.

    Correct Answer(s)
    B. Excess combustion air cause a furnace to waste energy.
    C. Excess air absorbs heat and carries it up the chimney.
    Explanation
    p145

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  • 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.

    Correct Answer(s)
    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.
    Explanation
    Cycling losses refer to the heat that is lost when the furnace or boiler cools down without effectively warming up the house. Additionally, if air continues to circulate through the heat exchanger after the burners shut down, heat will continue to flow into the building. These losses contribute to inefficient energy usage and can result in higher energy costs.

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  • 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.

    Correct Answer(s)
    B. The number of cycles
    D. The amount of heat required to heat up the exchanger
    E. The efficiency of the distribution system operating after the burners shut off.
    Explanation
    p 146

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  • 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.

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

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  • 40. 

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

    • A.

      True

    • B.

      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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  • 41. 

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

    • A.

      True

    • B.

      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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  • 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

    Correct Answer(s)
    A. Convection
    B. Radiation
    D. Heating fluid escaping the from the ducts and pipes
    Explanation
    Heat escapes the distribution system through convection, radiation, and heating fluid escaping from the ducts and pipes. Convection refers to the transfer of heat through the movement of fluid, such as air or water, which carries the heat away from the system. Radiation is the emission of heat in the form of electromagnetic waves, which can escape through walls and other surfaces. Heating fluid escaping from the ducts and pipes can also result in heat loss from the system.

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  • 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

    Correct Answer(s)
    B. Air pollution
    D. Fire
    Explanation
    p146

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  • 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

    Correct Answer(s)
    A. Carbon monoxide
    B. Nitrous oxide
    C. Water vapor
    D. Sulfur dioxide
    Explanation
    Carbon monoxide, nitrous oxide, water vapor, and sulfur dioxide are all gases resulting from combustion heating that can affect our health. Carbon monoxide is a poisonous gas that can cause headaches, dizziness, and even death in high concentrations. Nitrous oxide is a greenhouse gas that contributes to air pollution and climate change. Water vapor, although not directly harmful, can contribute to the formation of smog and air pollution. Sulfur dioxide is a toxic gas that can irritate the respiratory system and cause breathing difficulties.

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  • 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

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

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  • 46. 

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

    • A.

      True

    • B.

      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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  • 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.

    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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  • 48. 

    Dryers, fireplaces, and exhaust fans can cause depressureization that could lead to _____________ - _____________. 

    Correct Answer
    back drafting back-drafting
    Explanation
    p147

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  • 49. 

    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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  • 50. 

    Backdrafting  can be caused by:

    • A.

      Blocked or poorly designed chimney.

    • B.

      High winds

    • C.

      Suction near the furnace or boiler

    Correct Answer(s)
    A. Blocked or poorly designed chimney.
    B. High winds
    C. Suction near the furnace or boiler
    Explanation
    Backdrafting refers to the reverse flow of combustion gases, such as carbon monoxide, into the living space instead of being properly vented out. This can occur due to a blocked or poorly designed chimney, where the gases are unable to escape effectively. High winds can also cause backdrafting by creating pressure differentials that disrupt the flow of gases. Additionally, suction near the furnace or boiler can create negative pressure, pulling the gases back into the living space.

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