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Author Question: Modern residential oil furnaces sense the flames using: A) Ultraviolet light sensors. B) A ... (Read 174 times)

TFauchery

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on: Jul 24, 2018
Modern residential oil furnaces sense the flames using:
 
  A) Ultraviolet light sensors. B) A thermal sensing stack switch.
  C) Flame rectification. D) A cadmium sulfide cell.

Question 2

MERV filter rating system:
 
  A) Compares the airflow resistance of different filters when fully loaded.
  B) Compares the overall arrestance value of all sizes of particles.
  C) Compares the airflow resistance of different filters when they are new.
  D) Compares the arrestance value of 12 different ranges of particle size.


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kiamars2010

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Reply #1 on: Jul 24, 2018
Answer to Question 1

D

Answer to Question 2

D


TFauchery

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Reply #2 on: Jul 24, 2018
Thanks


kiamars2010

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Reply #3 on: Jul 24, 2018
Welcome :)


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