The three kinds of material used for fabricating ductwork are _________, ___________, and __________.
Fill in the blank(s) with the appropriate word(s).
sheet metal, ductboard, and flexible
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What device operates by comparing the current in the energized hot line to the current in the neutral line and opening the circuit if these currents differ by more than a 4 to 6 milliamperes?
What will be an ideal response?
To prevent the liquid contents in a pipe from freezing, engineers often apply coils of heated wire or tubing called:
a. Insulation b. Heat shielding c. Heat tracing d. Steam traps
If each common rafter (including tail) of a gable roof is 14? long, how many 16? pieces of lumber will be needed
to provide common rafters for a 30?-long building with no overhang, constructed on 24? centers? a. 32 b. 30 c. 28 d. 42
A rectangular concrete pad 180 inches wide and 450 inches long supports four transformers. Each transformer base measures 100 inches by 68 inches. What percent of the pad surface area is covered by the transformers? Round the answer to the nearer hundredth percent.
Fill in the blank(s) with the appropriate word(s).