Which of the following statements is correct ?

- 1
  
  Lower critical Reynolds number is of no practical significance in pipe flow problems.
- 2
  
  Upper critical Reynolds nymber is significant in pipe flow problerms.
- 3
  
  Lower critical Reynolds number has the value 2000 in pipe flow.
- 4
  
  Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.

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