Questions and Answers
What characterizes unilateral tolerance?
Which tolerance type permits variations on both sides of the basic size?
What defines compound tolerance?
What should be avoided in practice concerning compound tolerance?
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Which of the following is a characteristic of geometrical tolerance?
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What is a common application of unilateral tolerance in engineering?
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When using bilateral tolerance, how does the upper limit compare to the basic size?
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Which of the following statements is true regarding angular tolerances?
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What is the main characteristic of unilateral tolerance?
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How is tolerance defined in terms of high limit and low limit?
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Which of the following describes bilateral tolerance?
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Compound tolerance includes which of the following characteristics?
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What is geometric tolerance primarily concerned with?
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What is the tolerance applied for a basic size of 20 mm with a high limit of 20.03 mm and low limit of 19.98 mm?
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Why is it important to specify measurement tolerances in engineering?
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Which of the following statements best describes a feature of unilateral tolerance?
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What does a feature control frame indicate in geometrical tolerances?
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What is a positive allowance in terms of shaft and hole sizes?
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What type of tolerance is associated with features like flatness and roundness?
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When calculating maximum allowance, which formula is used?
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What does concentricity in geometrical tolerance ensure?
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What is bilateral tolerance?
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Which statement accurately represents geometrical tolerance applications in engineering?
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What would be a characteristic of unilateral tolerance?
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Study Notes
Types of Tolerance
- Tolerance refers to permissible variations in dimensions, determining acceptable dimensional accuracy in manufacturing.
Unilateral Tolerance
- Variation is allowed in one direction only (either upper or lower side).
- Example: Basic size could be 30 with tolerances of +3.0 and -2.0.
Bilateral Tolerance
- Variation is permitted on both sides of the basic size.
- Example: Basic size 30 with upper tolerance of +3.0 and lower tolerance of -2.0.
Compound Tolerance
- Defined by established tolerances that combine multiple types.
- Incorporates factors like angular and lateral tolerances.
- Example: Dimension 'l' is dependent on other dimensions (L, h, θ), with the minimum tolerance affected by their respective tolerances.
- Recommended to avoid in practice due to complexity.
Geometric Tolerance
- Relates to geometrical features like flatness, straightness, squareness, and roundness.
- Involves limits: Highest permissible size (High limit) and lowest permissible size (Low limit).
- Example: For a basic size of 20 mm, the high limit is 20.03 mm (+0.03) and the low limit is 19.98 mm (-0.02).
Tolerance Calculation
- Tolerance is calculated as the algebraic difference between the high limit and low limit.
- Example: For basic size 20 mm, High limit 20.03 mm, and Low limit 19.98 mm, the tolerance is 0.05 mm.
Allowance
- Allowance is the difference between the basic dimensions of mating parts.
- Positive allowance occurs when the shaft size is less than the hole size, negative allowance when the shaft size exceeds the hole size.
- Maximum and minimum allowances are calculated from their respective dimensions.
Examples of Allowance
- For components with basic dimensions of 0.500 inches, allowances are determined based on the size disparities of mating parts.
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Description
Test your knowledge on the concepts of unilateral and bilateral tolerance in engineering. This quiz covers the fundamental definitions and applications of these tolerance types, essential for manufacturing and design. Perfect for students studying engineering technology.
