Fluid Mechanics

511.The head loss due to sudden contraction is proportional to

1. Velocity
2. Velocity head
3. Turbulence
4. None of these

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512.The head loss due to sudden expansion is

1. (V₁ 2 - v² 2)/2g_c
2. (V₁ - v²)2/2g_c
3. (V₁ - v²)/2g_c
4. (V₁ 2 - v² 2)/g_c

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513.The head loss in turbulent flow in a pipe varies

1. As velocity
2. As (velocity)2
3. Inversely as the square of diameter
4. Inversely as the velocity

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514.The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe)

1. v²
2. 1/v²
3. 1/V
4. V

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515.The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is

1. 4(R_o-R_i)
2. √(Ro-R_i)
3. 2(R_o-R_i)
4. R_o + R_i

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516.The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

1. √(HW/π)
2. HW/2 (H + W)2
3. HW/4 (H + W)2
4. 2HW/(H + W)

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517.The hydrodynamic and thermal boundary layers will merge, when

1. Prandtl number is one
2. Schmidt number tends to infinity
3. Nusselt number tends to infinity
4. Archimedes number is greater than 10000

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518.The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation

1. dq/dx = K
2. dq/dx = K.q
3. dq/dx = K/q
4. dq/dx = Kq₂

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519.The kinetic energy correction factor for velocity distribution of laminar flow is

1. 0.5
2. 1.66
3. 1
4. 2

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520.The Kozeny-Carman equation, rewritten in terms of non-dimensional numbers gives (ΔP/pu2 ) proportional to

1. (L/D_p)/R_e
2. R_e/(D_p/L)
3. (L/D_p)/R_e 2
4. R_e ²/(D_p/L)

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