A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is

Fluid Mechanics
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is

28 mm/s

12 mm/s

24 mm/s

16 mm/s

28 mm/s

12 mm/s

24 mm/s

16 mm/s

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Fluid Mechanics
The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.

Bingham plastic

Dilatent

Newtonion

Pseudoplastic

Bingham plastic

Dilatent

Newtonion

Pseudoplastic

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Fluid Mechanics
Prandtl mixing length is

Applicable to laminar flow problems

None of these

A universal constant

Zero at the pipe wall

Applicable to laminar flow problems

None of these

A universal constant

Zero at the pipe wall

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Fluid Mechanics
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter

For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter

Venturimeter incurs less power loss compared to an equivalent orificemeter

Venturimeter occupies less space than an orificemeter

Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter

For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter

Venturimeter incurs less power loss compared to an equivalent orificemeter

Venturimeter occupies less space than an orificemeter

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Fluid Mechanics
For water, when the pressure increases, the viscosity

Decreases

Remains constant

First decreases, and then increases

Also increases

Decreases

Remains constant

First decreases, and then increases

Also increases

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Fluid Mechanics
While starting a centrifugal pump, its delivery valve should be kept

Closed

Either opened or closed; depending on the fluid viscosity

Opened

Either opened or closed ; it does not make any difference

Closed

Either opened or closed; depending on the fluid viscosity

Opened

Either opened or closed ; it does not make any difference

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Fluid Mechanics

Fluid Mechanics The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.

Fluid Mechanics Prandtl mixing length is

Fluid Mechanics Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

Fluid Mechanics For water, when the pressure increases, the viscosity

Fluid Mechanics While starting a centrifugal pump, its delivery valve should be kept

Fluid Mechanics
The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.

Fluid Mechanics
Prandtl mixing length is

Fluid Mechanics
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

Fluid Mechanics
For water, when the pressure increases, the viscosity

Fluid Mechanics
While starting a centrifugal pump, its delivery valve should be kept