In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.

A

Compressible cakes and laminar

B

Incompressible cake and laminar

C

Compressible cake and turbulent

D

Incompressible cake and turbulent

A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of the filtrate for ____ flow of filtrate.

A

Compressible cake and laminar

B

Incompressible cake and laminar

C

Compressible cake and turbulent

D

Incompressible cake and turbulent

Are these statements about the pressure drop in filtration true? Statement 1: Due to the increase in the solids deposit in the pores. Statement 2: For constant solids concentration at the inlet increase in this pressure drop with time is constant.

A

True, False

B

True, True

C

False, True

D

False, False

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

A

$$\frac{{\text{Q}}}{2}$$

B

$$\frac{{\text{Q}}}{4}$$

C

$$\frac{{\text{Q}}}{8}$$

D

$$\frac{{\text{Q}}}{{16}}$$

The filtrate flow rate in constant pressure filtration

A

Continuously increases

B

Continuously decreases

C

Remains constant throughout

D

May increase or decrease ; depends on the pressure

The filtrate flow rate in constant pressure filtration _____

A

Continuously increases

B

Continuously decreases

C

Constant throughout

D

No effect

Consider the following statements and choose the correct answer:
1. The density of water varies inversely with temperature
2. The density of water varies inversely with the concentration of dissolved substances
3. Water is more dense at approximately 4° C and becomes progressively less dense as it is cooled below +4° C
4. When great evaporation occurs in a lake having no outlet, the lake may come to contain a higher percentage of salts than the ocear

A

Only 1, 2 and 3 are true

B

Only 2, 3 and 4 are true

C

Only 1, 3 and 4 are true

D

Only 1, 2 and 4 are true

Which of the following statements about filtration medium resistance are correct? Statement 1: Filtration resistance results in frictional drag. Statement 2: Filtrate velocity is directly proportional to pressure difference.

A

True, False

B

True, True

C

False, True

D

False, False

A rotary drum filter with 30% submergence is used to filter concentrated aqueous slurry of calcium carbonate containing 15lb of solids per cubic foot of water. The pressure–drop is 2011Hg. If the filter cake contains 50% mixture (wet basis), calculate the filter area required to filter 10 gal/min of slurry. The filter cycle time is 5 min. The specific cake resistance depends on the pressure–drop as: α (ft/lb) = α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.

A

≅ 88 ft2

B

= α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance. a) ≅ 88 ft2 [ ≅ 86 ft2

C

≅ 82 ft2

D

≅ 90 ft2

Filtrate flow rate in case of a rotary drum vacuum filter (in which R_m c) is proportional to __________ and the cycle time (where, $$\mu $$ = filtrate viscosity, R_m = filter medium resistance, R_c = cake resistance ).

A

$$\sqrt \mu $$

B

$$\frac{1}{{\sqrt \mu }}$$

C

$$\frac{1}{\mu }$$

D

$$\frac{1}{{{\mu ^2}}}$$

In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

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