When comparing duct materials, none have a lower friction rate or are as durable as:
A) Sheet metal B) Ductboard C) Flex duct D) Fiberboard
A
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The tip wire is connected to ground and the ring wire is connected to _____.
A. 3 or 6 V B. 6 V C. 12 or 24 V D. -48 V
Which of the following statements about metal in-ground structural support grounding electrodes is not true?
A. It is considered a grounding electrode if one or more of the steel members is in direct contact with the earth for 10 ft (3.0 m) or more. B. It is considered a grounding electrode if 10 ft (3.0 m) or more of one or more of the steel members is encased in concrete that is in direct contact with the earth. C. It is an above-ground metal frame that is bonded to a concrete-encased grounding electrode. D. It is considered a grounding electrode if a steel column is driven into the ground 6 ft (1.8 m) to hardpan.
Which of the following objects can be drawn in the 3D space, without necessarily being parallel to the XY plane of the current UCS?
a. Circle b. Line c. Arc d. Polyline
Technician A states that a ni-resist insert is a groove insert used on aluminum trunk type pistons. Technician B states ni-resist inserts are often used in the oil ring grooves. Who is correct?
A. Technician A only. B. Technician B only. C. Both A and B. D. Neither A nor B.