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A small bore is designated as 25H7. The lower (minimum) and upper (maximum) limits of the bore are 25.000 mm and 25.021 mm, respectively. When the bore is designated as 25H8, then the upper (maximum) limit is 25.033 mm. When the bore is designated as 25H6, then the upper (maximum) limit of the bore (in mm) is
  • a)
    25.001
  • b)
    25.005
  • c)
    25.009
  • d)
    25.013
Correct answer is option 'D'. Can you explain this answer?
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A small bore is designated as 25H7. The lower (minimum) and upper (max...

i.e. upper limit of bore = 25.013
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A small bore is designated as 25H7. The lower (minimum) and upper (max...
Given information:
- Bore designation: 25H7
- Lower limit of the bore: 25.000 mm
- Upper limit of the bore: 25.021 mm

To find the upper (maximum) limit of the bore when it is designated as 25H6.

Let's break down the bore designation:

- The first number, 25, represents the nominal size of the bore.
- The letter 'H' represents the fundamental deviation. It indicates the difference between the actual size of the bore and the nominal size.
- The second number, 7, represents the tolerance grade. It specifies the range within which the actual size of the bore can vary.

When the bore is designated as 25H8:
- The fundamental deviation 'H' is increased from H7 to H8.
- The upper limit of the bore is increased from 25.021 mm to 25.033 mm.

When the bore is designated as 25H6:
- The fundamental deviation 'H' is decreased from H7 to H6.
- The upper limit of the bore will decrease compared to the H7 designation.

To find the upper limit of the bore when it is designated as 25H6, we need to determine the difference between the upper limits of the H7 and H6 designations.

Let's calculate the difference:

Upper limit of 25H7 designation: 25.021 mm
Upper limit of 25H8 designation: 25.033 mm

Difference between the upper limits: 25.033 mm - 25.021 mm = 0.012 mm

Since the fundamental deviation 'H' is decreased from H7 to H6, the upper limit of the bore will decrease by the difference we calculated.

Upper limit of 25H6 designation = Upper limit of 25H7 designation - Difference
= 25.021 mm - 0.012 mm
= 25.009 mm

Therefore, the upper (maximum) limit of the bore when it is designated as 25H6 is 25.009 mm. Hence, the correct answer is option 'D'.
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A small bore is designated as 25H7. The lower (minimum) and upper (maximum) limits of the bore are 25.000 mm and 25.021 mm, respectively. When the bore is designated as 25H8, then the upper (maximum) limit is 25.033 mm. When the bore is designated as 25H6, then the upper (maximum) limit of the bore (in mm) isa)25.001b)25.005c)25.009d)25.013Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A small bore is designated as 25H7. The lower (minimum) and upper (maximum) limits of the bore are 25.000 mm and 25.021 mm, respectively. When the bore is designated as 25H8, then the upper (maximum) limit is 25.033 mm. When the bore is designated as 25H6, then the upper (maximum) limit of the bore (in mm) isa)25.001b)25.005c)25.009d)25.013Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A small bore is designated as 25H7. The lower (minimum) and upper (maximum) limits of the bore are 25.000 mm and 25.021 mm, respectively. When the bore is designated as 25H8, then the upper (maximum) limit is 25.033 mm. When the bore is designated as 25H6, then the upper (maximum) limit of the bore (in mm) isa)25.001b)25.005c)25.009d)25.013Correct answer is option 'D'. Can you explain this answer?.
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