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CHEMICAL ENGINEERING

A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be
[A].

8400 Pa/m

[B].

12600 Pa/m

[C].

18900 Pa/m

[D].

16800 Pa/m

Answer: Option B

Explanation:

No answer description available for this question.

A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is
[A].

1

[B].

0

[C].

< 1

[D].

> 1

Answer: Option C

Explanation:

No answer description available for this question.

For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to
[A].

x

[B].

1/x

[C].

x

[D].

1/x

Answer: Option A

Explanation:

No answer description available for this question.

For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

With increasing flow rate, the hydraulic efficiency of a centrifugal pump

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: With increasing flow rate, the hydraulic efficiency of a centrifugal pump
[A].

monotonically decreases.

[B].

decreases and then increases.

[C].

remains constant.

[D].

increases and then decreases.

Answer: Option A

Explanation:

No answer description available for this question.

With increasing flow rate, the hydraulic efficiency of a centrifugal pump Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is
[A].

10 KPa

[B].

20 KPa

[C].

30 KPa

[D].

40 KPa

Answer: Option B

Explanation:

No answer description available for this question.

A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A free jet of water of cross-sectional area 0.01m2 and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A free jet of water of cross-sectional area 0.01m2 and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is
[A].

200 N

[B].

400 N

[C].

2000 N

[D].

4000 N

Answer: Option D

Explanation:

No answer description available for this question.

A free jet of water of cross-sectional area 0.01m2 and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is
[A].

4.4 KPa

[B].

2.94 KPa

[C].

3.7 KPa

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is Read More »

CHEMICAL ENGINEERING, Fluid Mechanics

For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as

CHEMICAL ENGINEERING, Fluid Mechanics /
Question: For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as
[A].

d

[B].

d2

[C].

d4

[D].

Answer: Option D

Explanation:

No answer description available for this question.

For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as Read More »

CHEMICAL ENGINEERING, Fluid Mechanics