What is the purpose of purging with nitrogen while brazing?
A) To help the flame burn a little hotter
B) To prevent oxide formation inside the pipes
C) To check for leaks at the same time you are brazing
D) To blow the oxides off of the walls before it has a chance to firmly adhere
B
You might also like to view...
Social order is important, and there is an established dominance ____________________ in any herd of horses.
Fill in the blank(s) with the appropriate word(s).
What class of fire would burning oil be considered?
A. Class C B. Class D C. Class A D. Class B
Through the _____________________ cycle, water is constantly cycled through the process of evaporation, condensation, and precipitation
Fill in the blank(s) with correct word
What is considered a long-line application for residential air conditioning?
A) Lines exceeding 100 ft in length or with a vertical rise of more than 30 ft B) Lines exceeding 50 ft in length or with a vertical rise of more than 10 ft C) Lines exceeding 80 ft in length or with a vertical rise of more than 20 ft D) Air-conditioning systems can run lines for nearly any length with no problems.