Explain the significance of each part of this bolt specification. 2" x ¼" NC-20 hex head
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The first dimension given, 2 inches is the length of the bolt. The second dimension, ¼ inch, is the outside or major diameter of the bolt. The letters NC refer to the fact that this a national coarse threaded bolt. It has twenty threads per inch, and the bolt has a hex head.
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Explain the purpose of lettering on the drawing of a part or mechanism and how it is done.
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One piston has a mass of 389.6 grams, while another piston has a mass of 398.4 grams. How much more mass does the heavier piston have?
A) 8.8 grams B) 8.2 grams C) 9.2 grams D) 9.8 grams
Which one of the following has a toggle operating state?
A) D latch B) D flip-flop C) J-K flip-flop D) S-R latch