Allowances and Tolerances in Mechanical Engineering
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Questions and Answers

What is the difference between the nominal dimension and the upper and lower limit of size?

  • Fit
  • Tolerance (correct)
  • Allowance
  • Precision

    • What is the acceptable range for a precision cylindrical part?

  • The range is usually much smaller for mating cylindrical parts (correct)
  • The range is not specified for precision cylindrical parts
  • The range is usually much larger for mating cylindrical parts
  • The range is the same for mating cylindrical parts and sheet metal repairs

    • What is the purpose of an allowance in sheet metal work?

  • To specify the difference between the nominal dimension of a part and its upper or lower limit (correct)
  • To provide a range of acceptable sizes for a part
  • To specify the nominal dimension of a part
  • To specify the tolerance of a part

    • What is the upper limit of size minus the lower limit of size in a dimension with a tolerance of ±0.020 in?

    <p>0.020 in.</p> Signup and view all the answers

    In aircraft drawings, what is the dimension tolerance assumed for a dimension given as a common fraction?

    <p>±1/64 in.</p> Signup and view all the answers

    What is the difference between the upper and lower limit of size in a dimension with a tolerance of ±0.0005 in?

    <p>0.0010 in.</p> Signup and view all the answers

    What is the purpose of an allowance in mating cylindrical parts?

    <p>To provide a difference between the maximum material limits of mating parts</p> Signup and view all the answers

    What is the maximum material limit of a bolt?

    <p>The maximum diameter of the bolt</p> Signup and view all the answers

    What is the result of a maximum diameter of a bolt being 0.001 in. less than the minimum diameter of the hole?

    <p>Positive allowance</p> Signup and view all the answers

    What is the purpose of a clear system of labelling in precision tooling and equipment?

    <p>To indicate the inspection or calibration period</p> Signup and view all the answers

    What information should a label on precision tooling and equipment show?

    <p>The date last tested, the next inspection or calibration date, and the authorised person's signature or stamp</p> Signup and view all the answers

    What is the result of a maximum diameter of a bolt being 0.001 in. greater than the minimum diameter of the hole?

    <p>Negative allowance</p> Signup and view all the answers

    What is the purpose of a nominal dimension in an aircraft drawing?

    <p>To state the size of a part as specified on the drawing</p> Signup and view all the answers

    What is the difference between the nominal dimension and the upper and lower limits of size?

    <p>Tolerance</p> Signup and view all the answers

    What is the purpose of upper and lower limits of size in precision cylindrical parts?

    <p>To ensure proper fit and function of a part</p> Signup and view all the answers

    What is the symbol used to represent inches in drawings and dimensional specifications?

    <p>″ (double prime symbol)</p> Signup and view all the answers

    What is the range of sizes within which a part is considered acceptable?

    <p>Upper and lower limits of size</p> Signup and view all the answers

    Why is it important to consider tolerance when manufacturing precision cylindrical parts?

    <p>To ensure proper fit and function of a part</p> Signup and view all the answers

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