Module 2: Measurements

Question 1

Measurement

Answer 1

act of measuring or being measured

Question 2

Inspection

Answer 2

Ensures what is being manufactured will meet specifications

Question 3

Testing

Answer 3

evaluates product quality or performance

Question 4

Inspection: Attributes (gauging)

Answer 4

uses gauges, reported as YES/NO, GO/NO GO

Question 5

Inspection: Variables (measurements)

Answer 5

uses calibrated instruments, reported in actual dimensions

Question 6

Linear standard

Answer 6

the meter, 1 inch = 0.0254m

Question 7

Accuracy

Answer 7

ability to hit what is aimed at

Question 8

Precision

Answer 8

repeatability of the process

Question 9

Allowance

Answer 9

the intentional desired difference between two mating parts

Question 10

Tolerance

Answer 10

undesirable, but permissible deviation from a desired dimension

Question 11

Bilateral tolerance

Answer 11

Plus or minus deviation from the nominal size. Applied to both sides of the dimension.

Question 12

Unilateral Tolerance

Answer 12

deviation is in one direction from the nominal size

Question 13

Limits

Answer 13

Maximum and minimum dimensions

Question 14

Geometric tolerance

Answer 14

The maximum allowable deviation of a form or position from the perfect geometry. Specified with respect to a datum or reference surface

Question 15

Maximum Material Condition

Answer 15

MMC: indicates a part is made with the maximum allowable material

Question 16

Least Material Condition

Answer 16

LMC: part is made with the minimum allowable material

Question 17

Regardless of feature size

Answer 17

RFS: indicates that tolerances apply to a geometric feature for any size it may be

Question 18

Gauge Capability

Answer 18

rule of 10 states that for reliable measurements, each successive step in the inspection sequence should have 10 times the precision of the preceding step

Question 19

Linearity

Answer 19

refers to the calibration accuracy of the device over its full working range. is it linear?

Question 20

Repeat accuracy

Answer 20

how repeatable is the device in taking the same reading over and over on a given standard

Question 21

stability

Answer 21

How well does the device retain its calibration over a period of time? (drift)

Question 22

Magnification

Answer 22

the amplification of the output portion of the device over the actual input dimension

Question 23

Resolution

Answer 23

“sensitivity” refers to the smallest unit of scale or dimensional input that the device can detect or distinguish

Question 24

Interferometry

Answer 24

Uses light interference bands to determine the distance and thickness of objects