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VIZAG MT Mechanical: 2013(Re-exam) Official Paper

- Between 100 - 150 N /m
^{2} - Between 151 - 200 N/m
^{2} - Between 201 - 350 N/m
^{2} - Between 351 - 450 N/m
^{2}

Option 4 : Between 351 - 450 N/m^{2}

Free

ST 1: Building Material and Concrete Technology

18752

20 Questions
20 Marks
12 Mins

__Concept:__

Shear stress in the oil

\(τ = μ \times \frac {∂ V}{∂ y}\)

where: μ = Dynamic viscosity, τ = Shear stress, V = velocity of plate, y = distance between the plates.

__Calculation:__

__Given:__

Thickness = t = 1.2 cm = 0.012 m, μ = 15 poise = 1.5 Ns/m^{2}, ΔV = 3.25 m/s

\(τ = μ \times \frac {∂ V}{∂ y}\) \(τ = μ \times \frac {Δ V}{t}\)

\(τ = 1.5\times \frac {3.25}{0.012} = 406.25~N/m^2\)

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