Multiple choice general knowledge science & technology

12)The M-system and E-system in metrology are related with measurement of

  1. a)gears

  2. b)screw threads

  3. c)flatness

  4. d)surface finish
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The M-system and E-system are both metrology standards used for measuring surface finish (roughness). M-system (Mottling system) and E-system (Envelope system) provide different ways to characterize surface texture - M-system uses mean line parameters while E-system uses envelope parameters. Gears (A) use specialized gear measuring systems. Screw threads (B) have thread measurement systems. Flatness (C) is a geometric tolerance measured differently.

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