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Numerical - Step ratio
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Design of Machine Elements - 1
Q. What is the step ratio for R40 series?
- Published on 14 Sep 15
a.
1.44
b.
1.05
c.
4.0
d.
0.4
ANSWER: 1.05
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Discussion
Sravanthi
-Posted on 29 Oct 15
- Series of numbers obtained by geometric progression are called as preferred numbers. The basic preferred series are R5, R10, R20, R40 and R80.
- The step ratio of R40 is
40
√10. Therefore,
40
√10 = 1.06
- Similarly, step ratio for different series can be obtained.
- R5 =
5
√10 = 1.58
- R10 =
10
√10 = 1.26
- R20 =
20
√10 = 1.12
➨
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