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# Separation Processes MCQ’s – Design of Solid Liquid Cake-Filtration Devices Based on Pressure Gradients

What do the pressure filtration devices consist that remains suspended while allowing the fluid in which the solids are suspended to pass through?

a) Semipermeable membrane

b) Mesh barrier

c) No barrier

d) Column

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Answer: b

Explanation: The pressure filtration devices consist of Mesh barrier that remains suspended while allowing the fluid in which the solids are suspended to pass through.

The filtration models are based on which laws?

a) Pascals law

b) Roult’s law

c) Avogadro’s law

d) Darcy’s law

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Answer: d

Explanation: The filtration models are based on darcy’s law deve;oped in 1855 to describe flow of water in sand beds.

Which of the following is the correct representation of the darcy’s law?

a) (-k/µ)(dp/dz)

b) (-kµ)(dp/dz)

c) (k/µ)(dp/dz)

d) (kµ)(dp/dz)

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Answer: a

Explanation: The correct representation of the darcy’s law is (-k/µ)(dp/dz) since it is inversely proportional to the viscosity of the medium.

Why a pump that delivers slurry to a filtration unit at constant pressure not a positive displacement pump?

a) Because it operates at variable floe rate

b) Because it operates at constant flow rates

c) Because the time of flow is different

d) Because the time of flow is same

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Answer: b

Explanation: A pump that delivers slurry to a filtration unit at constant pressure not a positive displacement pump because it operates at constant flow rates.

If the reported filter area A= 1m^{2}

Viscosity µ = 5*10^{-4}

Pressure difference = 100

And the intercept is 500

What is the value of medium’s resistance to flow?

a) 1*10^{8}

b) 5*10^{8}

c) 6*10^{8}

d) 2.5*10^{8}

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Answer: a

Explanation: Since R_{m}= ΔPA(intercept)/µ, hence R_{m}=1*10^{8}.

If the reported filter area A= 1m^{2}

Viscosity µ = 1*10^{-4}

Pressure difference = 100

And the intercept is 500

What is the value of medium’s resistance to flow?

a) 1*10^{8}

b) 5*10^{8}

c) 6*10^{8}

d) 2.5*10^{8}

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Answer: b

Explanation: Since R_{m}= ΔPA(intercept)/µ, hence R_{m}=5*10^{8}

If the reported filter area A= 1m2

Viscosity µ = 5*10-4

Pressure difference = 100

And the intercept is 3000

What is the value of medium’s resistance to flow?

a) 1*108

b) 5*108

c) 6*108

d) 2.5*108

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Answer: c

Explanation: Since R_{m}= ΔPA(intercept)/µ, hence R_{m}=6*10^{8}.

If the reported filter area A= 1m^{2}

Viscosity µ = 2*10^{-4}

Pressure difference = 100

And the intercept is 500

What is the value of medium’s resistance to flow?

a) 1*10^{8}

b) 5*10^{8}

c) 6*10^{8}

d) 2.5*10^{8}

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Answer: d

Explanation: Since Rm= ΔPA(intercept)/µ, hence Rm=2.5*108.

If the reported filter area A= 1m2

Viscosity µ = 10*10-4

Pressure difference = 100

And the intercept is 500

What is the value of medium’s resistance to flow?

a) 0.5*108

b) 23*108

c) 11*108

d) 5.3*108

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Answer: a

Explanation: Since R_{m}= ΔPA(intercept)/µ, hence R_{m}=0.5*10^{8}.

If the reported filter area A= 1m^{2}

Viscosity µ = 5*10^{-4}

Pressure difference = 100

And the intercept is 700

What is the value of medium’s resistance to flow?

a) 12*10^{8}

b) 5.5*10^{8}

c) 9.5*10^{8}

d) 1.4*10^{8}

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Answer: d

Explanation: Since R_{m}= ΔPA(intercept)/µ, hence R_{m}=1.4*10^{8}.