List two important limitations of single-ply roof (SPR) membrane over built-up roof (BUR) and modified-bitumen roof (MBR) membranes.
What will be an ideal response?
1. SPR membranes are far more flexible than BUR or MBR membranes; so they can withstand much larger
expansion and contraction stresses?an advantage in climates with large annual temperature variations.
2. A typical SPR membrane is much thinner than BUR or MBR membranes and hence lighter in weight. Therefore,
they are available in wider and longer rolls than BUR or MBR membranes. Hence, they can be installed to cover a
larger roof area in the same time duration.
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A ____ is the tendency of a force to cause rotation about a certain point.
A. Newton B. moment C. Torr D. foot-pound
What tool is used to turn the stems on manual stem service valves?
What will be an ideal response?
A technician is recovering refrigerant R-22 to be properly disposed. Each unit emptied produced 25 5/6 ounces of R-22. If 11 units are emptied, how many ounces of R-22 did the technician recover?
Fill in the blank(s) with the appropriate word(s).
Other than the required dimensions, what spring data must be noted below and to the right?
A. material B. number of coils C. direction of winding D. all of the above