How did serpentine heat exchangers compare to older heat ...

[penguins]

How did serpentine heat exchangers compare to older heat exchangers?
 
  A) The serpentine heat exchangers required a heat-induced fan, causing negative pressure.
  B) The serpentine heat exchangers became straighter and longer.
  C) The serpentine heat exchangers were made from plastic.
  D) The serpentine heat exchangers utilized a pressure switch.

Question 2

The temperature rise of a furnace is:
 
  A) The BTU rating of the furnace.
  B) The amount of temperature a furnace can add to a house.
  C) The temperature difference between the air entering the furnace and leaving the furnace.
  D) The difference between the flue gas temperature and the combustion air temperature.

[joewallace]

Answer to Question 1

A

Answer to Question 2

C

[penguins]

Excellent

[aliotak]

TYSM