What type of head is the most common for screws used on unit covers?
A) Hex head B) Allen head C) Square head D) Round head
[Ques. 2] What is the difference between the way a self-threading and a self-drilling sheet metal screw is used?
A) Self-threading screws must have a pilot hole.
B) Self-threading can only be installed with a counterclockwise rotation.
C) Self-drilling can only be installed with a counterclockwise rotation.
D) Self-drilling screws must have a pilot hole.
[Ques. 3] Why are the ends of round-tipped sheet-metal screws not threaded?
A) To protect against damaging the sheet metal
B) To assist with self-drilling
C) To prevent sheet metal from bulking
D) To protect against shorting of wires within the electrical panel
[Ques. 4] Why should you use round-tipped sheet metal screws?
A) To minimize the possibility of damaging the sheet metal during installation
B) To expedite the installation process
C) To minimize the possibility of bodily harm
D) To eliminate the possibility of a sharp point damaging electrical wire insulation
[Ques. 5] What type of screws are used on electrical panels?
A) Wood screws B) Self-tapping sheet-metal screws
C) Nails D) Round-tipped sheet-metal screws
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