Numerical - Step ratio

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
 

    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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