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).

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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.

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Branch ducts should always use what component to balance the air to the individual areas?

What will be an ideal response?

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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

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