When is the indoor metering device bypassed?

When is the indoor metering device bypassed?
 
  A) Both the heating and defrost cycles B) Both the cooling and defrost cycles
  C) The cooling cycle D) The heating cycle

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[Ques. 2] How does the presence of 7 to 9 percent CO2 in flue gas reflect heating unit performance?
 
  A) It indicates a possible gas leak. B) It indicates a lack of efficiency.
  C) It indicates that the unit is running efficiently. D) It indicates the level of CO2 is neutral.

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[Ques. 3] A graphical representation of air properties is:
 
  A) An enthalpy chart. B) A temperature-pressure chart.
  C) A pressure-temperature chart. D) A psychrometric chart.

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[Ques. 4] A building earns a LEED rating by:
 
  A) Following a detailed, prescriptive methods for design and construction.
  B) Earning points in five different areas.
  C) Paying for a LEED stamp of certification.
  D) Using LEED-approved materials and contractors.

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[Ques. 5] Select possible cause(s) of an iced-up evaporator on a commercial freezer. You may select more than one.
 
  A) Bad defrost timer motor B) Open defrost heaters
  C) Bad evaporator fan motor D) Bad condenser fan motor
  E) Shorted defrost termination switch F) Dirty condenser