The maximum length of trunk duct in an extended plenum system is _____.
a. 24' (7.3 m)
b. 16' (4.9 m)
c. 12' (3.7 m)
d. 4' (1.2)
a. 24' (7.3 m)
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The degree of slope required for a horizontal vent is governed by the _____.
a. health department b. atmospheric pressure c. local code d. length of the drain
A shear block is used _________.
A) at the dead-load anchor of a mullion. B) at the expansion anchor of a mullion. C) to connect a rail to adjacent mullions. D) at a mullion expansion joint to allow the mullion to move. E) none of the above.
The microfilm used in mechanical engineering is generally prepared as one frame or print attached to this type of card.
a. photocopy b. aperture c. roll d. microfilm
A transformer that has the secondary winding connected in series with the primary at a junction terminal is a(n) _____.
a. current transformer b. instrument transformer c. power transformer d. autotransformer