Which statement is correct regarding the cleaning of base metals before welding?
a. All metals should be cleaned before welding.
b. It is not necessary to clean new metal.
c. Metals only need to be cleaned if they show signs of corrosion.
d. Metals only need to be cleaned if they are painted or coated.
a
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If a 120V feeder for nonmotor loads feeds a continuous load rated at 20A and a noncontinuous load at 30A, what size overcurrent protective device should be selected?
a. 45A b. 60A c. 70A d. 80A
Which of the following square junction boxes must be used if there is one 6" conduit and two 4" conduits entering on one side of the box and exiting at a 90° angle on another side of the box? (Assume the conductor size is No. 4 AWG or larger, but operating at less than 600V.)
a. 24" b. 30" c. 36" d. 44"
The Latin term hortus is short for horticulture
Indicate whether the statement is true or false
Barometric dampers are operated by:
A) A small gear motor. B) A pair of large magnetic solenoids. C) A damper motor, pulley, and belt. D) The air pressure difference across the damper.