As per Indian code of practice, the frequency ratio (ratio of operating frequency of a machine to the natuaral frequency of soil) should not be within the range of

- 1
  
  0.5 to 1.5
- 2
  
  1.0 to 2.5
- 3
  
  1.5 to 3.0
- 4
  
  3.0 to 6.0

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