Question 1 of 10
What is the primary function of the holes in the prongs of Type-A and Type-B electrical plugs, according to the article?
The holes served multiple purposes: secure grip, manufacturing efficiency, and material reduction.
Question 2 of 10
Who is credited with inventing the NEMA 1-15 plug?
Harvey Hubbell II invented the NEMA 1-15 plug.
Question 3 of 10
Which organization provides official regulations related to electrical plugs and outlets in the US?
NEMA (National Electrical Manufacturers Association) and ANSI (American National Standards Institute) provide regulations.
Question 4 of 10
What is the main difference between NEMA 1-15 and NEMA 5-15 plugs?
NEMA 5-15 has a grounding pin for safety.
Question 5 of 10
According to the article, are the holes in the prongs mandatory for electrical plugs?
The holes are optional, mainly for manufacturing and grip.
Question 6 of 10
What can be placed in the holes of plug prongs for safety purposes?
A lock or tag can prevent unauthorized use.
Question 7 of 10
The article mentions a concept that can be utilized with the holes in the prongs to prevent unauthorized operation. What is this concept?
The holes facilitate LOTO procedures.
Question 8 of 10
Which of the following is NOT a reason cited for the continued use of the prong hole design?
The design's longevity is tied to existing standards, not evolving voltage levels.
Question 9 of 10
What is the typical voltage level found in US residential electrical systems?
US homes typically use both 120V and 240V.
Question 10 of 10
Which of the following is most closely related to the function of the holes in the plug prongs?
The holes primarily assist in the physical connection and retention of the plug within the outlet.
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