Why is gypsum board recognized as a noncombustible material by the codes although it has paper lining on both sides, which is a combustible material?
What will be an ideal response?
Gypsum is a noncombustible material as determined by ASTM E136 test. However, the code recognizes a material with noncombustible core, lined with a combustible material (of thickness ? 1/8 in. and flame spread rating ? 50), as a noncombustible material.
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A motor's speed is determined by ____.
A. size B. voltage C. amperage D. number of motor poles
Technician A says that loads should be rigged to prevent any parts from shifting or dislodging during the lift. Technician B says that suspended loads should be securely slung and properly balanced before they are set in motion.Who is correct?
A. Technician A B. Technician B C. Both D. Neither
A type of adjustable square that can be used to set, test, and transfer angles is called a _____
a) miter square b) sliding T-bevel c) try square d) speed square
Which non-return-to-zero encoding method represents a 1 bit by increasing voltage to a positive value and a 0 bit by decreasing the voltage to a negative value?
A. RZ B. NRZ-I C. polar D. ASK