What is the purpose of annealing copper tubing?
A) To allow the tubing to be formed without cracking or buckling
B) To remove impurities from the copper
C) To prepare the tubing for brazing
D) To harden the tubing and improve its strength
A
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Which sign in the figure above can be used to warn about unsafe practices?
a. B b. C c. D d. E
There are numerous job time charts published by industry trade groups that offer average times for the performance of typical tasks such as lawn mowing
Indicate whether the statement is true or false
____ rooflines, also known as cathedral ceilings, can either be in an unfinished attic or in a living space with finish material applied directly to the rafters.
A. Pointed B. A-line C. Vaulted D. Insulated
If the resistance against a centrifugal blower is doubled, the cfm output decreases, and the amperage draw of the motor ____.
A. decreases slightly B. increases slightly C. stays the same D. overheats the motor