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Question
The Moody chart, a logarithmic chart between frction factor and ........ for a variety of relative roughness in a pipe flow. 
A.
The discharge of the flow
B.
The density of the fluid
C.
Reynolds number
D.
The velocity of the flow
Answer ( Option C)

Reynolds number

Solution

Moody's diagram is used to calculate the friction factor of commercial pipes. It is drawn between friction factor and Reynolds number for various relative roughness. It is derived for the circular pipe but applicable to other cross-sections as well provided that the diameter is replaced by 4 times the hydraulic radius. 
Thus the moody's chart is a graphical representation between the friction factor, relative roughness, and Reynolds number 
Hence the correct answer is option (c). 
Note:  Relative roughness is the ratio of pipe roughness and the pipe diameter. 

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