Question 30Steam Plants - QMED

The correct answer is D) 14. The flame observation port, labeled as item 14 in the illustration SG-0016, is the means by which the flame may be visually checked for color and condition. This is a standard feature in air register and burner assemblies, as it allows the operator to inspect the flame and ensure it is burning properly and safely. The other answer choices are incorrect because they do not represent the flame observation port. Items 2, 4, and 10 are likely other components of the air register and burner assembly, but they do not serve the specific purpose of allowing visual inspection of the flame.