Fluid Mechanics

211.For laminar flow through a closed conduit

1. V_max = 2V_av
2. V_max = V_av
3. V_max = 1.5V_av
4. V_max = 0.5V_av

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212.For Laminar flow through a packed bed, the pressure drop is proportional to (V_s is the superficial liquid velocity and D_p is the particle diameter)

1. V_s/D_p²
2. V_s ²/D_p ²
3. V_s ²/Dp³
4. V_s/D_p³

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213.For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is

1. More
2. Less
3. Equal
4. Independent of porosity

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214.For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is

1. More
2. Less
3. Equal
4. More or less, depending on the type of particle

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215.For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by

1. ∂u/∂x = 0
2. ∂(ρu)/∂x = 0
3. (∂u/∂x) = - (∂ρ/∂t)
4. ∂ρ/∂t = 0

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216.For pipe flows, head is proportional to _________ at constant capacity(where, D = pipe diameter).

1. 1/D
2. 1/d²
3. 1/D⁵
4. d²

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217.For pipes that must be broken at intervals for maintenance, the connector used should be a/an

1. Union
2. Tee
3. Reducer
4. Elbow

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218.For steady ideal fluid flow, the Bernoulli's equation states that the

1. Velocity is constant along a stream line
2. Energy is constant throughout the fluid
3. Energy is constant along a stream line, but may vary across stream lines
4. None of these

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219.For the free settling of a spherical particle through a fluid, the slope of, CD-log N_Re, plot is

1. 1
2. -1
3. 0.5
4. -0.5

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220.For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to

1. R
2. R²
3. R⁴
4. R0^.5

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