After a duct system has been cleaned, it is always a good idea to _____
a. spray germicide on the interior of the duct
b. replace all air filters with HEPA filters
c. make a video record of the inside of the duct
d. seal all interior duct seams with mastic
c
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_____, as applied to brick masonry work, is the projection of successive courses of brick out from the face side of a wall to form a shelf or ledge and support the wall above.
A. Coping B. Anchoring C. Gingerbread work D. Corbeling
The on-site installation time for a fiberboard system is __________ than for a prefabricated duct system, but the cost of the material is __________.
A. greater, less B. less, greater
Many practitioners feel that a system, once compromised, can never be restored to a trusted state.
Answer the following statement true (T) or false (F)
Mutual induction is when more than one inductor coil is mounted on a common ____ core.
a. copper b. air c. gold d. iron