A combination of two sounds with equal SPL values always results in
a. a 2-dB increase over the SPL of one source alone
b. a l0-dB increase over the SPL of one source alone
c. a doubling of the SPL value of one source alone
d. not enough information given
e. none of the above
e
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A check needs to be performed of all junction boxes, conduit bodies, and disconnect switches to make sure they are ____________________ and suitable for outside installations.
Fill in the blank(s) with the appropriate word(s).
If flue gas temperatures in a gas fired boiler go below 300°F, what is a possible consequence?
A) Reduced efficiency. B) Condensation of moisture. C) Change in flue gas color.
Branch ducts should always use what component to balance the air to the individual areas?
What will be an ideal response?
An atom having seven electrons in the valence shell is ____ conductive than an atom having three electrons in the valence shell.
A. equally as B. less C. more D. not enough information is given