To prevent water from flooding out the opening when the plug is removed, a _____ can be attached to the test plug
A) retainer plate B) water removal plate
C) retainer ring D) large wing nut
B
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The most commonly used sets of axes for mass properties analysis calculations are either the Cartesian axes (standard x-, y-, or z-axes) or the ____ axes.
A. cylindrical B. momentum C. centroidal D. polar
Which of the following is used in pipe systems which are expected to experience significant thermal expansion?
a. Rubber anchors b. Flexible tape c. Expansion circuits d. Expansion loops
When there is an elbow in fiberglass duct, a hanger must be placed within _____.
a. 12 inches of the elbow throat b. 12 inches of the connection to the straight duct c. 18 inches of the elbow throat d. 18 inches of the connection to the straight duct
What is the purpose of the metal prongs extending below a DC light fixture base?
a. to hold the fixture in place b. to ground the fixture to prevent shock c. to project through the wire and make contact with conductors d. none of the above