Before two pieces of metal can be joined by brazing, both pieces must first be
____________________.
Fill in the blank(s) with the appropriate word(s).
ANS: cleaned
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The ____________________ temperature of a material is the temperature at which combustion (rapid oxidation) can begin.
Fill in the blank(s) with the appropriate word(s).
When metal is burned away, ____.
A. oxygen forms an iron oxide B. oxygen forms iron dioxide C. the iron turns to cast iron D. the iron turns to oxygen
If two north magnetic poles are brought close to each other, ________
A) an electromagnet is created B) a force of repulsion pushes them apart C) a current is induced D) a force of attraction pulls them together
Why do most humidifiers require annual cleaning and media replacement?
A) A chemical reaction between the media and the water causes a crusty white buildup. B) The media is slowly dissolved by the water used in the humidifier. C) Minerals in the water are left behind in the sump and media. D) The water attracts dirt from the air.