Energy-Efficient Motors and HVAC Systems Quiz
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Questions and Answers

Which material is specifically mentioned as being used in energy-efficient motors to improve reliability and performance?

  • Plastic
  • Aluminum (correct)
  • Arc steel
  • Copper

    • What is a common misconception about energy-efficient motors?

  • They are more efficient than standard motors.
  • They operate at higher temperatures.
  • They accelerate loads faster.
  • They may deliver less torque. (correct)

    • Which of the following is a primary benefit of implementing energy-efficient motors?

  • Reduced dependency on fossil fuels (correct)
  • Higher maintenance costs
  • Increased greenhouse gas emissions
  • Increased energy losses

    • What construction feature differentiates energy-efficient motors from standard motors?

    <p>Greater quality and thinner laminations of steel</p> Signup and view all the answers

    What is one primary benefit of using operable windows in a school building for ventilation purposes?

    <p>They can enhance occupants' sense of well-being and control over their environment.</p> Signup and view all the answers

    Which standard is recognized for outside air ventilation related to HVAC systems?

    <p>ASHRAE Standard 62.1-2010</p> Signup and view all the answers

    Which of the following is NOT a critical feature to specify for air handling units?

    <p>Single wall cabinet to reduce costs.</p> Signup and view all the answers

    Which factor should be considered when designing systems for natural ventilation?

    <p>Location of openings relative to outdoor pollution sources.</p> Signup and view all the answers

    What is a disadvantage of unit ventilators and individual heat pump units in school buildings?

    <p>They may lead to greater issues with moisture due to wall penetrations.</p> Signup and view all the answers

    Which of the following is an advantage of using central HVAC air handling units over individual units?

    <p>They provide better control over humidity and drainage.</p> Signup and view all the answers

    What percentage of electricity used in the industrial sector is typically consumed by electric motors?

    <p>70%</p> Signup and view all the answers

    What is the formula for calculating the efficiency of an electric motor?

    <p>Efficiency = (Mechanical Power Output / Electrical Power Input) x 100%</p> Signup and view all the answers

    Which of the following is a benefit of implementing energy efficient motors in the industry?

    <p>Lower environmental costs</p> Signup and view all the answers

    How did motor designs change after 1975?

    <p>They were constructed to meet higher performance levels.</p> Signup and view all the answers

    What inefficiency occurs in electric motors that operate at less than optimal efficiency?

    <p>Heat dissipation</p> Signup and view all the answers

    What is the primary function of double wall doors with gaskets in an HVAC system?

    <p>To provide better thermal and acoustic insulation</p> Signup and view all the answers

    What is the minimum acceptable outside air flow rate per person for school classrooms established by ASHRAE?

    <p>15 cubic feet per minute (cfm)</p> Signup and view all the answers

    How can energy recovery ventilation systems benefit schools dealing with outdoor air supply?

    <p>By making the outdoor air behave like less than it actually is while maintaining indoor air quality</p> Signup and view all the answers

    What is the recommended minimum distance that outdoor air intakes should be placed away from potential sources of contamination?

    <p>25 feet</p> Signup and view all the answers

    Which feature should be included in air filter assemblies to minimize air leakage?

    <p>Gaskets and sealants at bypass points</p> Signup and view all the answers

    What is a key benefit of using air handlers in spaces with highly variable occupancy?

    <p>Reducing energy consumption and controlling moisture.</p> Signup and view all the answers

    Which filter efficiency rating range is recommended for air filters to ensure the best protection?

    <p>35% to 80% dust-spot rating or MERV 8 to 13.</p> Signup and view all the answers

    What method can be used to effectively reduce pressure drop across air filters?

    <p>Design a system with larger filter surface area.</p> Signup and view all the answers

    Why is it beneficial to install a pressure differential gauge across filter banks?

    <p>It helps determine when filters need replacing without guessing.</p> Signup and view all the answers

    How can gaseous contaminants be most effectively managed in an HVAC system?

    <p>By controlling potential pollution sources rather than relying solely on filters.</p> Signup and view all the answers

    What is the primary strategy for preventing mold growth in duct systems?

    <p>Preventing moisture contamination of the duct work</p> Signup and view all the answers

    What is a consequence of air leakage from HVAC ducts?

    <p>Condensation of humid air in building cavities</p> Signup and view all the answers

    Which insulation product properties can trap moisture if they get wet?

    <p>Fibrous structure with large surface area</p> Signup and view all the answers

    In addition to preventing moisture, which is a secondary strategy to reduce potential mold growth?

    <p>Investigating insulation products that minimize moisture penetration</p> Signup and view all the answers

    Why should the petroleum or fish oil coating on sheet metal ducts be removed?

    <p>To prevent it from trapping dirt particles</p> Signup and view all the answers

    Which method uses natural convection to enhance air distribution and reduce energy consumption?

    <p>Vertical displacement ventilation</p> Signup and view all the answers

    Which areas in schools need special exhaust ventilation to maintain indoor air quality?

    <p>Janitor closets and copy rooms</p> Signup and view all the answers

    What is a possible source of moisture entering duct work?

    <p>Condensation droplets from improperly drained cooling coils</p> Signup and view all the answers

    What is a common method to capture pollutants from copy machines?

    <p>Connecting a vent kit to an exhaust fan.</p> Signup and view all the answers

    What causes problems related to indoor air quality (IAQ) in buildings?

    <p>Improper pressurization.</p> Signup and view all the answers

    Which of the following is NOT a recommended feature for exhaust ventilation in workrooms?

    <p>Open windows to improve airflow.</p> Signup and view all the answers

    What is the primary function of the diffuser in a centrifugal pump?

    <p>To house the impeller and direct water flow.</p> Signup and view all the answers

    What criteria affect the pressure generated by a centrifugal pump?

    <p>Diameter and number of impellers.</p> Signup and view all the answers

    Why should exhaust systems avoid operation when the HVAC system is turned off?

    <p>To prevent the introduction of unconditioned moist air.</p> Signup and view all the answers

    What is the typical design pressure range for a building to minimize outdoor air pollutants?

    <p>0 to 0.03 in.w.g.</p> Signup and view all the answers

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