Author Question: What contaminants must be removed prior to joint fit-up? A) mill scale B) rust C) varnish D) ... (Read 23 times)

acc299 · **on:** Jul 26, 2018

What contaminants must be removed prior to joint fit-up?

A) mill scale
B) rust
C) varnish
D) paint
E) none of the above

Question 2

Gas valves for an intermittent pilot system

A) have a pulsing LED that indicates valve activity
B) are the same as traditional combination gas valves
C) have both a pilot valve and a main valve
D) have a single gas outlet that switches between the pilot light and the main burners