Fluid Mechanics

351.Nature of fluid flow during the opening of a valve in a pipeline is

1. Laminar
2. Unsteady
3. Steady
4. Uniform

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352.Navier-Stokes equation is useful in the analysis of _________ fluid flow problems.

1. Non-viscous
2. Viscous
3. Turbulent
4. Rotational

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353.Net positive suction head (NPSH) of a centrifugal pump must be

1. Greater than the vapour pressure of the liquid
2. Less than the vapour pressure of the liquid
3. Equal to the vapour pressure of the liquid
4. Less than barometric pressure

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354.Newton's law of viscosity relates the

1. Shear stress and velocity
2. Velocity gradient and pressure intensity
3. Shear stress and rate of angular deformation in a fluid
4. Pressure gradient and rate of angular deformation

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355.Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its

1. Inner diameter
2. Outer diameter
3. Thickness
4. Neither inner nor outer diameter

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356.Nominal size of a pipe is an indication of its _________ diameter.

1. Inner
2. Outer
3. Approximate
4. None of these

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357.Nominal size of the discharge pipe of a pump is usually _________ the nominal size of the inlet pipe.

1. Smaller than
2. Larger than
3. Same as
4. Twice

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358.Non-colloidal solution is an example of the _________ fluid.

1. Non-Newtonian
2. Newtonian
3. Dilatent
4. Pseudo-plastic

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359.Normal depth in open channel flow is the depth of flow in the channel

1. Corresponding to uniform flow
2. Measured normal to the channel bed
3. Corresponding to steady flow
4. None of these

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360.One dimensional flow implies

1. Flow in a straight line
2. Steady uniform flow
3. Unsteady uniform flow
4. A flow which does not account for changes in transverse direction

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