SSC JE Mechanical Engineering 2017 Set 1 Paper

Question : 159 of 200

Marks: +1, -0

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

1.117cm/sec
11.17cm/sec
111.7cm/sec
1.117 m/sec

Validate

Solution:

Re=2320
From the equation

\Re = (\pvd/µ)

V = (2320×.0101×1000)/(20×1000)

V= 1.1716 cm/sec

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