If an induced-draft gas burner produces a flame that is ...

[azncindy619]

If an induced-draft gas burner produces a flame that is completely blue, or blue with tiny yellow tips, it is an
  indicator of _____.
 
  a. incomplete combustion
  b. normal operation
  c. too much primary air
  d. too much secondary air

Question 2

In order for combustion to occur, there must be _____.
 
  a. fuel, CO2, and ignition
  b. radiation, conduction, and convection
  c. fuel, oxygen, and aldehyde
  d. fuel, heat, and oxygen

[covalentbond]

Answer to Question 1

b

Answer to Question 2

d

[azncindy619]

Thanks for the timely response, appreciate it

[amandalm]

Great answer, keep it coming