Explain how a hot bitumen built-up roof membrane is created and why this specific technique is used.
What will be an ideal response?
?A built-up roof consists of alternate plies of organic or fiberglass roofing felt with a hot bitumen coating mopped over each layer. The design of the roof varies by situation but generally consists of three or more layers of felt with a bitumen layer over each and a bitumen topcoat with aggregate rolled on top.
Felts provide the needed reinforcement to keep bitumens in each layer from alligatoring. Alligatoring refers to surface cracking caused by oxidation and shrinkage stresses, which can result in a repetitive mounding of the asphalt surface similar to an alligator's hide.
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____ is/are made by bonding treated wood fibers with Portland cement or some other binder and compressing them into structural panels.
A. Gypsum concrete decks B. Cement-wood-fiber roof decking C. Lightweight insulating concrete D. Manufactured wood panels
The operating cost of a pulverized coal cyclone furnace is expected to be $80,000 per year. The steam produced will be needed for 6 years—now through year 5. Using a spreadsheet, determine the equivalent annual worth, A, in years 1 through 5 of the operating costs at an interest rate of 10% per year.
What will be an ideal response?
The operating pressure of the condenser in a domestic refrigerator will increase as the temperature of the room ____________________.
Fill in the blank(s) with the appropriate word(s).
Using the Zeigler-Nichols tuning method, the proportional setting for the proportional-only mode will be different than the proportional setting for the proportional-plus-integral control mode.
Answer the following statement true (T) or false (F)