Fluid Mechanics

161.Drag force acting on a body does not depend upon the

1. Density of the fluid
2. Density of the body
3. Velocity of the body
4. Projected area of the body

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162.Drag force on the float of a Rotameter is (where Q = flow rate of the)

1. ∝ Q
2. ∝ √Q
3. ∝ Q₂
4. Constant

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163.Drag is defined as the force exerted by the

1. Fluid on the solid in a direction opposite to flow
2. Fluid on the solid in the direction of flow
3. Solid on the fluid
4. None of these

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164.Drag is the force component exerted on an immersed object,

1. Passing the centroid of the body at 60°to the direction of motion
2. The component being parallel to the flow direction
3. The component being normal to the flow direction
4. None of these

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165.Draining of shallow pits or sump is done by a sump pump, which is a _________ pump.

1. Single stage vertical
2. Centrifugal
3. Plunger
4. Diffuser

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166.During ageing of fluid carrying pipes, the

1. Pipe becomes smoother with use
2. Friction factor increases linearly with time
3. Absolute roughness decreases with time
4. Absolute roughness increases linearly with time

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167.Each term in Bernoulli‟s equation represents the _________ of the fluid.

1. Energy per unit mass
2. Energy per unit weight
3. Force per unit mass
4. None of these

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168.Each term of the Bernoulli's equation written in the form, (p/ρ) + (g/g_c). Z + (v²/2g_c) = constant, represents the total energy per unit

1. Mass
2. Volume
3. Specific weight
4. None of these

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169.Efficiency of power transmission (ε) through a circular pipe is given by (h_t - h_f)/h_t, which has a maximum value of _________ percent.

1. 1.37708333333333
2. 50
3. 66.6
4. 88.8

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170.Enamels and paints are generally _________ fluid.

1. Rheopectic
2. Pseudo-plastic
3. Thixotropic
4. Dilatant

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