The purpose of an electrical overload device is to protect against:

The purpose of an electrical overload device is to protect against:
 
  A) Excessive voltage. B) Power surges.
  C) Excessive resistance. D) Excessive current.

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[Ques. 2] What material are electric heater coils often made from?
 
  A) Steel and chrome alloy wire B) Copper and brass
  C) Nickel-chrome alloy wire D) Silicon carbide

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[Ques. 3] What is the purpose of the legend on HVACR electrical diagrams?
 
  A) To provide a reference list of the circuits used in the diagram
  B) To show all the product variations and trace the history of that model
  C) To provide the operational sequence for the unit
  D) To list the symbols used in the diagram and define their use

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[Ques. 4] What device can best be described as an electrically operated switch?
 
  A) A transformer B) A transducer C) A fuse D) A relay

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[Ques. 5] An advantage of a warm-air electric furnace compared to an oil or gas furnace is:
 
  A) Lower operating cost in most parts of the country.
  B) No vent pipes, chimney, or makeup air are required.
  C) Warmer supply air temperatures.
  D) Lower power requirements.