Consider the following statements As the pipe ages:
(i) The friction factor increases non-linearly with time.
(ii) The pipe becomes smoother with time.
(iii) The absolute roughness increases linearly with time.
Which of the above statement are correct?
1
(i) only
2
(ii) and (iii)
3
(i) and (iii)
4
(i), (ii) and (iii)