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    Questionnaire On Geometric Dimensions and Tolerances

    Uploaded by

    POOJA KUMARI
    This document contains a 13 question multiple choice questionnaire about geometric dimensioning and tolerancing (GD&T). GD&T involves expressing true part specifications using tolerances rather than just plus/minus dimensions. It allows for tighter tolerances, better communication between design and manufacturing, and can save money. Key terms defined include datum features, feature control frames, material condition modifiers, and positional tolerances. Rule 1 addresses how size tolerances can affect form tolerances. There are also questions about datum reference frames, MMC virtual condition, and interpreting geometric tolerances on a sample part drawing.

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    Questionnaire On Geometric Dimensions and Tolerances

    Uploaded by

    POOJA KUMARI
    82 views5 pages
    This document contains a 13 question multiple choice questionnaire about geometric dimensioning and tolerancing (GD&T). GD&T involves expressing true part specifications using tolerances rather than just plus/minus dimensions. It allows for tighter tolerances, better communication between design and manufacturing, and can save money. Key terms defined include datum features, feature control frames, material condition modifiers, and positional tolerances. Rule 1 addresses how size tolerances can affect form tolerances. There are also questions about datum reference frames, MMC virtual condition, and interpreting geometric tolerances on a sample part drawing.

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    QUESTIONNAIRE ON GEOMETRIC DIMENSIONS AND TOLERANCES

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    This document contains a 13 question multiple choice questionnaire about geometric dimensioning and tolerancing (GD&T). GD&T involves expressing true part specifications using tolerances rather than just plus/minus dimensions. It allows for tighter tolerances, better communication between design and manufacturing, and can save money. Key terms defined include datum features, feature control frames, material condition modifiers, and positional tolerances. Rule 1 addresses how size tolerances can affect form tolerances. There are also questions about datum reference frames, MMC virtual condition, and interpreting geometric tolerances on a sample part drawing.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    82 views5 pages

    Questionnaire On Geometric Dimensions and Tolerances

    Uploaded by

    POOJA KUMARI
    This document contains a 13 question multiple choice questionnaire about geometric dimensioning and tolerancing (GD&T). GD&T involves expressing true part specifications using tolerances rather than just plus/minus dimensions. It allows for tighter tolerances, better communication between design and manufacturing, and can save money. Key terms defined include datum features, feature control frames, material condition modifiers, and positional tolerances. Rule 1 addresses how size tolerances can affect form tolerances. There are also questions about datum reference frames, MMC virtual condition, and interpreting geometric tolerances on a sample part drawing.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 5

    QUESTIONNAIRE ON GEOMETRIC DIMENSIONS AND TOLERANCES

    1. Using GD&T:

     a) Tighter tolerances can be achieved in manufacturing.

     b) Creates a means for expressing the true design requirements for a part.

     c) More tolerance is made available to manufacturing than is possible with only
    plus/minus tolerancing

     d) Both b) and c)

    2. How can properly implemented GD&T save money in the manufacturing process?

     a) Better definition of the design requirements, increased availability of tolerances, better
    communication between design, manufacturing and inspection, fewer engineering changes.

     b) It can't. GD&T is just a way to illustrate how to inspect parts.

     c) By creating extra tolerance that did not physically exist without using GD&T.

     d) By defining the datum references that must be used by manufacturing for fixturing.

    3. What is a Basic Dimension?

     a) An exact dimension with no tolerance associated with it.

     b) A dimension in a box that must be strictly adhered to by manufacturing.

     c) The nominal size of a feature.

     d) A numerical value that describes a theoretically exact size, profile, orientation or
    location of a feature or a datum target. It is the basis from which permissible variations
    (tolerances) are established.

    4. What is a Feature Control Frame?

     a) A symbolic means of expressing the type of control on a feature, and defining a
    tolerance zone for that control.

     b) A box on the drawing that tells the manufacturer how to make the part.
     c) A box on the drawing that tells the inspector what measurements have to be made for
    every part.

     d) A symbol that dictates the tolerance of position for a datum target.

    5. What is a "Material Condition Modifier?"

     a) The maximum dimension possible according to the tolerance specified.

     b) The minimum dimension possible according to the tolerance specified.

     c) A symbol placed on a feature of size that states how much tolerance is available for
    that feature.

     d) A symbol (or lack thereof) placed in a feature control frame that indicates how much,
    or if, any extra geometric tolerance is available for the feature as the actual mating size of the
    feature changes.

    6. A positional tolerance defines:

     a) A zone within which the center, axis, or center plane of a feature of size is permitted
    to vary from a true position.

     b) A boundary located at the true position that may not be violated by the surface or
    surfaces of the considered feature, if the position specification is on an MMC or LMC basis.

     c) Both a and b.

     d) Neither a nor b.

    7. Which is the correct definition of regardless of feature size?

     a) Regardless of where a feature of size lies within its form tolerance, the tolerance of
    size must be met.

     b) Control placed on a feature of size stating that the tolerance of form or position must
    be met regardless of where the feature lies within its form tolerance.

     c) Regardless of where a feature of size lies within its size tolerance, the tolerance of size
    must be met.

     d) Control placed on a feature of size stating that the geometric tolerance must be met
    regardless of where the feature lies within its size tolerance.
    8. What is "Rule 1" (i.e. the "Envelope Rule" or the "Perfect form at MMC Rule"), and
    what effect does it have, if any, on
    flatness? ...straightness? ...perpendicularity? ...position?

     a) Unless otherwise specified, the limits of size of an individual feature of size control
    the form of the feature as well as the size. The rule can control flatness and straightness, but
    not perpendicularity or position.

     b) Size tolerance controls form tolerance. This rule has no effect on flatness,
    straightness, or position.

     c) If specified by using an MMC symbol next to the tolerances in a feature control
    frame, then size tolerance controls form. It affects flatness, straightness, perpendicularity and
    position.

    d) Rule 1 states that the form of a feature must always be perfect, but it has no effect on
    perpendicularity.

    9. What is the difference between a Datum and a Datum Feature?

     a) A Datum and Datum Feature are synonymous.

     b) A Datum is theoretical, a Datum Feature is real.

     c) A Datum is a feature of size, and a Datum Feature is a surface feature.

     d) A Datum Feature is theoretical, and a Datum is real.

    10. What is a Datum Reference Frame?

     a) Any arbitrary coordinate system.

     b) A set of target points from which measurements are made.

     c) A symbol on the drawing that specifies the tolerance associated with a particular
    feature.

     d) A set of three mutually perpendicular planes derived from the specified Datum
    Features in the order of precedence listed in a feature control frame.

    11. What is MMC Virtual Condition?

     a) The collective effect of the MMC limit of size of a feature of size, and any applicable
    geometric tolerance.

     b) The largest external feature (e.g. pin), or the smallest internal feature (e.g. hole).

     c) The perfectly formed envelope that just fits around (or inside of) a feature of size.
     d) Rule 1 states that the form of a feature must always be perfect, but it has no effect on
    perpendicularity.

    12.Refer to Figure 1 for the following questions:

    A. What is the MMC size of one of the holes

     a) Ø.240

     b) Ø.250

     c) Ø.260

     d) Ø.270
    B. What is the MMC Virtual Condition size of one of the holes?

     a) Ø.240

     b) Ø.250

     c) Ø.260

     d) Ø.270

    C. What is the LMC size of one of the holes?


     a) Ø.240

     b) Ø.250

     c) Ø.260

     d) Ø.270
    D. How much total positional tolerance would be available for one hole if that hole was
    produced at a size of Ø.255?

     a) Ø.010

     b) Ø.005

     c) Ø.020

     d) Ø.015

    13.Write the description for each Geometric Characteristic Symbol

    1. 

               

    2. 

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