What component is secured to one side of the stringer below the cut notches to add strength and rigidity?

a. Skirtboard
b. Guard
c. Strongback
d. Gooseneck


Answer: C

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A solid right cylinder 9.55 centimeters high contains 1750 cubic centimeters of material. Compute the cross-sectional area of the cylinder and round to the nearest tenth of a square centimeter.

A. 180.0 B. 183.2 C. 185.9 D. 189.5

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Fill in the blank(s) with correct word

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The reason many installations utilize a straight main trunk line with flexible duct runs to the individual register boots is to ____.

A. eliminate the expense of custom-made duct sections B. reduce excessive noise C. speed up the installation process D. all of the above

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Propane weighs _____ lbs per gallon.

Fill in the blank(s) with the appropriate word(s).

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