# GATE2013-13

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For a Newtonian fluid flowing in a circular pipe under steady state conditions in fully developed laminar flow, the fanning friction factor is

1. 0.046Re$^{-0.2}$
2. 0.0014 + $\frac{0.125}{Re^{0.32}}$
3. $\frac{16}{Re}$
4. $\frac{24}{Re}$
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