MEC322 – MIDTERM EXAM QUESTIONS
AND ANSWERS GRADED A+ 2026
Tolerance - ANS Total amount a dimension can be varied.
Unilateral vs. Bilateral Tolerance - ANS Bilateral - variation can be both positive and negative
Unilateral - variation in only one direction
3 Types of Part Fitting - ANS Clearance - Allows for rotation and sliding between parts
Interference - External fit of one part is larger than internal fit of other part
Transition - Small clearance or interference that allows for accurate location of mating parts
Difference Between Accuracy and Precision - ANS Accuracy - Closeness between
measurements and standards
Precision - Closeness between all measurements made
Inspections by Variables vs. Attributes - ANS Variables - measured by appropriate measuring
instruments
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 1
, Attributes - part dimensions are 'gauged' to determine if they are within tolerance
Acceptance Sampling - ANS Where a product is received and compared to a desired product.
Two Types of Limit Gage - ANS GO - Check dimension at highest material condition (smallest
hole)
NO GO - Check dimension at lowest material (larger hole)
Stylus Instrument - ANS Contact or non-contact tip that is used to measure the surface
Types of CMM Probes - ANS Fixed - solid piece of material
Touch-trigger - sends electrical signal to CMM when probe touches material
Optical - use light to measure surface distance
Scanning Lasers - ANS Where a laser beam is deflected by a rotating mirror to 'sweep' beam
of light past an object
Machine Vision - ANS Where image information is received, processed and interpreted by a
computer
Expendable Molds - ANS Must be destroyed to remove casting
Permanent Molds - ANS Can be used over and over for many castings
Cope & Drag (casting terms) - ANS Cope - upper half of mold
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 2
AND ANSWERS GRADED A+ 2026
Tolerance - ANS Total amount a dimension can be varied.
Unilateral vs. Bilateral Tolerance - ANS Bilateral - variation can be both positive and negative
Unilateral - variation in only one direction
3 Types of Part Fitting - ANS Clearance - Allows for rotation and sliding between parts
Interference - External fit of one part is larger than internal fit of other part
Transition - Small clearance or interference that allows for accurate location of mating parts
Difference Between Accuracy and Precision - ANS Accuracy - Closeness between
measurements and standards
Precision - Closeness between all measurements made
Inspections by Variables vs. Attributes - ANS Variables - measured by appropriate measuring
instruments
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 1
, Attributes - part dimensions are 'gauged' to determine if they are within tolerance
Acceptance Sampling - ANS Where a product is received and compared to a desired product.
Two Types of Limit Gage - ANS GO - Check dimension at highest material condition (smallest
hole)
NO GO - Check dimension at lowest material (larger hole)
Stylus Instrument - ANS Contact or non-contact tip that is used to measure the surface
Types of CMM Probes - ANS Fixed - solid piece of material
Touch-trigger - sends electrical signal to CMM when probe touches material
Optical - use light to measure surface distance
Scanning Lasers - ANS Where a laser beam is deflected by a rotating mirror to 'sweep' beam
of light past an object
Machine Vision - ANS Where image information is received, processed and interpreted by a
computer
Expendable Molds - ANS Must be destroyed to remove casting
Permanent Molds - ANS Can be used over and over for many castings
Cope & Drag (casting terms) - ANS Cope - upper half of mold
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 2
