Why are the ends of round-tipped sheet-metal screws not threaded?
A) To protect against shorting of wires within the electrical panel
B) To protect against damaging the sheet metal
C) To prevent sheet metal from bulking
D) To assist with self-drilling
A
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The best solution to air-duct leakage problems is _____.
a. manually sealing all leaks with duct tape b. keeping a nitrogen purge on the duct system c. properly sealing all ducts during installation d. adding insulation throughout the duct system
When planning a vegetable garden, the soil should have a pH range of _____
A) 5.3 to 7.0 B) 6.3 to 7.3 C) 6.3 to 7.0 D) 6.0 to 7.3
Llamas were widely used as pack animals by the _____ and other natives of the Andes mountains.
Fill in the blank(s) with the appropriate word(s).
A difference between a straight heat-cool thermostat and a heat pump thermostat is that
A) heat pump thermostats do not energize the fan in the heating cycle B) Y is energized in heating instead of cooling C) Y is energized in both heating and cooling D) Y and W swap functions