Fluid Mechanics

321.It is possible to integrate an automatic flow controller to a

1. Flow nozzle
2. Venturimeter
3. Rotameter
4. None of these

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322.Kinetic energy of fluid per unit weight represented by the velocity head is given by

1. 2v²/g_c
2. v²/2g_c
3. ρv²/g_c
4. ρ.v²/2g_c

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323.Laminar flow is characterised by the nonexistence of

1. Pressure fluctuation
2. Eddies
3. Deviating velocities
4. All (A), (B) & (C)

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324.Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds

1. 4000
2. 2100
3. 1500
4. 3000

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325.Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the _________ head.

1. Manometric
2. Total
3. Static
4. Friction

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326.Location of vena-contracta in an orificemeter does not depend upon the

1. Type of orifice
2. Density, viscosity & compressibility of the fluid
3. Ratio of pipe diameter to orifice diameter
4. Pipe roughness

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327.Low specific speed of a pump implies that, it is a/an _________ pump.

1. Axial flow
2. Centrifugal
3. Mixed flow
4. None of these

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328.Lower BWG means _________ of the tube.

1. Lower thickness
2. Lower cross-section
3. Outer diameter
4. Inner diameter

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329.Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?

1. < 0.3
2. > 3
3. 50
4. 1

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330.Mach number is important in a fluid flow problem, when the inertia and _________ forces predominate.

1. Elastic
2. Viscous
3. Gravity
4. None of these

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