The elevations for poured concrete are similar to those used for structural steel.
Answer the following statement true (T) or false (F)
True
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The heat produced by a rectifier ____.
A. leads to a higher amperage in DC than AC B. reduces the power efficiency of the welding machine C. increases the power efficiency of the welding machine D. can be recycled in a heat sink to provide power to other machines
According to the NLGI classification system, low numbers mean the grease is ________
A) Thin B) Brown C) Thick D) Red
When installing an oil-fired furnace in a confined space with a firing rate of 100,000 Btuh, what is the minimum free air opening required if the combustion air vents are directly communicating with the outside?
A) 100,000/1,000 = 100 sq in for each grille B) 100,000/4,000 = 25 sq in for each grille C) 100,000/5,000 = 20 sq in for each grille D) 100,000/2,000 = 50 sq in for each grille
List three differences between half-wave and full-wave/bridge rectifiers.
Fill in the blank(s) with the appropriate word(s).