Residential Energy Audit - Chapter 1

55 Questions | Total Attempts: 212

SettingsSettingsSettings
Please wait...
Residential Energy Audit - Chapter 1

Questions in this quiz are based on material in the following book:Residential Energy: Cost savings and comfort for existing buildingsAuthors: John Krigger & Chris Dorsi


Questions and Answers
  • 1. 
    What is the first law of thermodynamics?
    • A. 

      Kinetic energy is transitional energy.

    • B. 

      Heat moves from low to high temperature regions.

    • C. 

      Energy can not be created or destroyed.

  • 2. 
    What is the second law of thermodynamics?
    • A. 

      Energy can not be created or destroyed.

    • B. 

      Heat moves from high to low temperature regions - without additional energy from an external source.

    • C. 

      Kinetic energy is transitional energy.

  • 3. 
    __________________ is a measure of how fast molecules in a substance are moving or vibrating.
  • 4. 
    Choose the best definition of a BTU:
    • A. 

      Heat is measured in BTU's. It is the amount required to raise a pound of water's temperature 1deg Fahrenheit.

    • B. 

      Unexpected heat.

    • C. 

      BTU's cool materials.

  • 5. 
    Choose the correct statement
    • A. 

      The heat content is equal in each of the water containers.

    • B. 

      The heat content is directly related to the mass of the water.

  • 6. 
    What is latent heat?
    • A. 

      Latent heat is heat that can not be used.

    • B. 

      Latent heat is the heat released or absorbed when a material changes phase between a solid and a liquid or between a liquid and a gas.

  • 7. 
    Which of the following uses latent heat to carry energy from one place to another?
    • A. 

      Steam-heating systems

    • B. 

      Air conditioning

    • C. 

      Refrigerators

  • 8. 
    What is the boiling point of water?
    • A. 

      212 deg Fahrenheit or 100 deg Celsius

    • B. 

      100 deg Fahrenheit or 212 deg Celsius

  • 9. 
    778 foot-pounds is equal to how many BTU(s)?
    • A. 

      100

    • B. 

      10

    • C. 

      1

  • 10. 
    Three measures of energy are:
    • A. 

      BTU

    • B. 

      Foot-pounds

    • C. 

      PSI

    • D. 

      Gallons per minute

    • E. 

      Kilowatt-hours

  • 11. 
    Wind moves air from a high pressure region to a low pressure region until the pressure difference between the regions are equalized.
    • A. 

      True

    • B. 

      False

  • 12. 
    Energy can not be destroyed or created. Energy can be converted into another form.
    • A. 

      True

    • B. 

      False

  • 13. 
    Some of the heating energy flowing through pipes and ducts is lost by _________,_________, and ___________  from heated pipes and ducts to their surrounding and also by ai, steam or water escaping from their conduits.  
    • A. 

      Transmission

    • B. 

      Gravity

    • C. 

      Conduction

    • D. 

      Radiation

    • E. 

      Convection

  • 14. 
    Conduction happens when 
    • A. 

      Heat is transferred by a moving liquid such as air.

    • B. 

      Heat conducts through solid objects.

    • C. 

      Heat flies through space from one object to another.

  • 15. 
    Radiation happens when
    • A. 

      Heat flies through space from one object to another.

    • B. 

      Heat conducts through solid objects.

    • C. 

      Heat is transferred by a moving liquid such as air.

  • 16. 
    Convection happens when
    • A. 

      Heat conducts through solid objects.

    • B. 

      Heat is transferred by a moving liquid such as air.

    • C. 

      Heat flies through space from one object to another.

  • 17. 
    Bright white and polished metal objects reflect _________ to ___________ of incoming solar energy.
    • A. 

      10% to 49%

    • B. 

      80% to 98%

    • C. 

      50% to 63%

  • 18. 
    Darker colors absorb a lower percentage of incoming solar energy.
    • A. 

      True

    • B. 

      False

  • 19. 
    Glass reflect or absorb only 10% to 20% of the incident solar.
    • A. 

      True

    • B. 

      False

  • 20. 
    Glass reflect or absorb 50% to 100% of the incident solar.
    • A. 

      True

    • B. 

      False

  • 21. 
    Glass transmit around 80% to 90% of incident solar radiation.
    • A. 

      True

    • B. 

      False

  • 22. 
    Why is heat trapped within a greenhouse? (choose the most correct)
    • A. 

      Glass' solar transmittance and infrared absorbency.

    • B. 

      Lack of ventilation

  • 23. 
    Glass abosrbs earthly infrared radiation better than many plastic glazings, which transmit much of this radiation rather than absorbing it, resulting in greater heat loss from greenhouses glazed with plastic
    • A. 

      True

    • B. 

      False

  • 24. 
    Metalized glass coatings are also called
    • A. 

      Metal glass

    • B. 

      Low-e glass

    • C. 

      Carbon glass

  • 25. 
    Why are metalized coatings used on glass?
    • A. 

      Makes glass flexible.

    • B. 

      Makes glass shatterproof

    • C. 

      Reduces the glass' solar transmittance by reflecting some solar radiation.

  • 26. 
    Why is the sun's rays more intense when directly overhead?
    • A. 

      They travel trough less of the earth atmosphere.

    • B. 

      Because of the earth's oval shape.

    • C. 

      The sun radiates more heat at mid day.

  • 27. 
    Which of the following affects the comfort of people outside?
    • A. 

      Temperature

    • B. 

      Relative humidity

    • C. 

      Solar radiation

    • D. 

      Precipitation

    • E. 

      Wind effect

  • 28. 
    What outdoor conditions effects the space-conditioning needs of a home?
    • A. 

      Temperature

    • B. 

      Relative humidity

    • C. 

      Solar radiation

    • D. 

      Precipitation

    • E. 

      Wind effect

  • 29. 
    What does thermal equilibrium refer to?
    • A. 

      The inside is the same as the outside temperature.

    • B. 

      The temperature is at 65 deg Fahrenheit

    • C. 

      We feel comfortable within our environment without having to sweat or shiver.

  • 30. 
    Heating engineers use  a unit of measurement called a _______________ to describe how long the temperature  is below 65 deg Fahrenheit during each day, month or year.
  • 31. 
    Which is the correct cooling balance point?
    • A. 

      50 Deg F

    • B. 

      68 Deg F

    • C. 

      65 Deg F

    • D. 

      78 Deg F

  • 32. 
    To find cooling degree days, calculate how long the average temperature was above the _________________ _____________ _________ of 78 degrees F by totaling up the daily degree-day values.
  • 33. 
    Cooling degree days are less reliable  as a predictor of summer  cooling costs than heating degree days are for winter heating costs, because amount of shade and relative humidity are often more important than the outdoor air temperature in determining comfort..
    • A. 

      True

    • B. 

      False

  • 34. 
    __________ _____________ are often more important than the outdoor air temperature in determining comfort.
  • 35. 
    What does relative humidity measure?
    • A. 

      How wet the soil is.

    • B. 

      How saturated the air is with a percentage of water vapor.

    • C. 

      The ratio of water vapor in wooden structures.

  • 36. 
    Completely saturated air has a  rh percentage value of _______________
    • A. 

      212%

    • B. 

      112%

    • C. 

      100%

    • D. 

      0%

  • 37. 
    Relative humidity determines how effective sweat can evaporate from the skin.
    • A. 

      True

    • B. 

      False

  • 38. 
    Humid air has a profound heating-energy advantage to higher relative humidity because heat flow does not depend on temperature difference.
    • A. 

      True

    • B. 

      False

  • 39. 
    Warmer air can not hold more moisture than cooler air.
    • A. 

      True

    • B. 

      False

  • 40. 
    The outside air is 91 deg F and 51% rh. If it were to cool down to 70 deg F, the relative humidity value may change to _______.
    • A. 

      151% rh

    • B. 

      100% rh

    • C. 

      14 % rh

    • D. 

      10 % rh

    • E. 

      1% rh

  • 41. 
    Indoor humidity  is governed by _______________ and _____________ __ __________ _____.
    • A. 

      Temperature and humidity of outdoor air

    • B. 

      Appliances and shower habits

    • C. 

      Ventilation and windows

  • 42. 
    When warm air moves near cool objects, tiny beads of water called ______________ begins to form on its surface ( or frost on a freezing cold surface).
    • A. 

      Condensation

    • B. 

      Precipitation

    • C. 

      Acclimatization

  • 43. 
    Condensation formation on a window is undesirable because it fosters the growth of ________________ & __________________.
    • A. 

      Insects

    • B. 

      Microbes

    • C. 

      Ice

    • D. 

      Plants

  • 44. 
    Moving air is integral for summer comfort; rapidly moving air increases bodily heat losses through ________________.
    • A. 

      Radiation

    • B. 

      Convection

    • C. 

      Conduction

  • 45. 
    For the best indoor comfort during the summer, rh  should be less than ______%
    • A. 

      100

    • B. 

      90

    • C. 

      80

    • D. 

      70

    • E. 

      60

  • 46. 
    The chemical chain reaction  we call burning begins when
    • A. 

      Oxygen is available.

    • B. 

      Oxygen is not available.

    • C. 

      Carbon & hydrogen atoms in fuel molecules mix with oxygen and a flame.

    • D. 

      Hydrogen atoms in fuel molecules mix with oxygen and a flame.

    • E. 

      Carbon, boron & hydrogen atoms in fuel molecules mix with oxygen and a flame.

  • 47. 
    There is no efficiency loss the further the heat travels trough the air duct distribution system away from the heat exchanger
    • A. 

      True

    • B. 

      False

  • 48. 
    The transfer of chemical energy into heat at the flame is usually  more than _____% efficient. (choose the best answer)
    • A. 

      99

    • B. 

      90

    • C. 

      89

    • D. 

      80

  • 49. 
    Which of the following are needed for combustion?
    • A. 

      Oxygen

    • B. 

      Carbon

    • C. 

      Hydrogen

    • D. 

      Flame

  • 50. 
    Electrical heaters perform their heating trough ________________ & _________________.
    • A. 

      Convection

    • B. 

      Conduction

    • C. 

      Radiation

  • 51. 
    Electric water heaters perform their heating trough ________________ & _________________
    • A. 

      Convection

    • B. 

      Conduction

    • C. 

      Radiation

  • 52. 
    During the refrigeration cycle refrigerant evaporates in the evaporator, absorbing heat from the ________,  __________ and __________.
    • A. 

      Metal tubes

    • B. 

      Chemicals

    • C. 

      Fan

    • D. 

      Fins

    • E. 

      Passing air

  • 53. 
    During the refrigeration cycle refrigerant evaporates in the evaporator, absorbing heat from the metal tubes, fins and passing air. The compressor compresses the refrigerant, preparing it to condense within the condenser. The refrigerant's latent heat is then transferred to the condenser's tubes and fins and to the passing air.
    • A. 

      True

    • B. 

      False

  • 54. 
    In incandescent  light bulbs, only 10% of the electricity is converted into light, with the other 90% becoming heat.
    • A. 

      True

    • B. 

      False

  • 55. 
    What factors determine indoor comfort?
    • A. 

      Air temperature

    • B. 

      Moving air

    • C. 

      Relative humidity

    • D. 

      Radiant temperature