Cable trays are covered in _____.
a. NEC Article 344
b. NEC Article 355
c. NEC Article 376
d. NEC Article 392
d. NEC Article 392
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Which of the following is equal to 45/16?
a. 1-13/16 b. 2-13/16 c. 2-13/32 d. 2-3/4 e. None of the above
Using the laser welding process, it is possible to weld heat-treated alloys without undoing the heat treatment.
Answer the following statement true (T) or false (F)
What causes the little pops and pings can be heard in some furnaces before the blower comes on?
A) Small concentrated pockets of gas that explode B) Expansion of the heat exchanger as it heats up C) Mechanical rattles from an unbalanced indoor blower D) Small quantities of water in the gas
What units are used to measure vacuum?
A) In negative psi (-psi) B) In inches of mercury C) In reciprocal psi (1/psi) D) In negative pascals (-p)