Traditionally, seal shafts consisted of _____
A) O-rings and gaskets around a shaft B) a spring-loaded shaft seal
C) a stuffing box packed with grease D) rope or braided style packing in a stuffing box
D
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The NEC requires that the ____ conductor have an outer finish that is either continuous white or gray for alternating-current circuits.
a. ungrounded b. charged c. grounded d. uncharged
A measure of a substance's capacity to allow the passage of liquids or gases is its_____.
a. vapor resistance b. permeability c. penetrability d. humidity quotient
Backing strips used in root passes are usually made from a piece of metal that is ____ thick and ____ wide.
A. 1 inch, 1/4 inch B. 1/2 inch, 2 inches C. 1/2 inch, 1 inch D. 1/4 inch, 1 inch
Lever-type grease guns can develop pressures up to _____
A) 1,000 psi B) 3,000 psi C) 5,000 psi D) 10,000 psi