Which of the following is a correct statement regarding the selection and/or connection of shielding-gas cylinders to the welding equipment?
A) The shielding gas selection is not important; all of the available gases do an equal job in all welding applications.
B) Remove the cylinder's protective cap, momentarily crack the cylinder valve open to blow out any dirt, and then close it.
C) When using argon as a shielding gas, special precautions and respirators are required due to its toxicity.
D) Install the regulator/flowmeter assembly first, then crack the cylinder valve open to blow out any dirt and debris.
B
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The most common coil symbol used in schematic diagrams is the ____________________.
Fill in the blank(s) with the appropriate word(s).
According to the NEC®, neutral conductors size No. 6 and smaller must have a continuous marking of white or _____.
a. black b. yellow c. gray d. red
Which of the following commercial loads can be fed from a regular circuit rather than an emergency circuit?
a. Exit lights b. Life safety systems c. Fire alarm systems d. Computer equipment
What is an engineering change notice?
What will be an ideal response?