SSC JE Mechanical Engineering 2015 Paper

Question : 107 of 200

Marks: +1, -0

Water at 20°C is flowing through a 20 cm diameter pipe. Take kinematic viscosity of water at 20°C = 0.0101 stoke. Assume that the changes from laminar to turbulent at Re = 2320. The critical velocity will be:

1.117 cm/s
11.17 cm/s
111.7 cm/s
0.117 cm/s

Validate

Solution:

Re= {\ν\vd}/µ \;\;\;\; ∵ µ/ρ=ν

(kinematic viscosity)

2320={v ×20}/0.0101

v = 1.1716 cm/s

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