What do you mean by the term Backwashing ?

Excluding intermittent use of compressed air during process

Is a form of destructive maintenance

Washing at the backside of the filter

Including intermittent use of compressed air during the process.

What type of filter does not come under the Membrane filters?

Precoat (filter aid) filtration

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: (ft/lb) = ( p)0.26, where = 2.90 1010

nViscosity of the filtrate = 6.72 10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.

Filter aid can also be added to the fermentation broth to increase the porosity of the cake as it forms , what does this statement means?

To increase the pH of the fermentation broth

To decrease the filtration rate

To decrease the pI of the fermentation broth

To increase the filtration rate

Explore topic-wise MCQs in Bioprocess Engineering.

This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.	Which of the following do not comes under continuous filtration?
A.	Vacuum rotary drum filter
B.	Rubber belt filter
C.	Belt filter cake discharge
D.	Disc filter
Answer» E.

Discussion

2.	What do you mean by the term Backwashing ?
A.	Excluding intermittent use of compressed air during process
B.	Is a form of destructive maintenance
C.	Washing at the backside of the filter
D.	Including intermittent use of compressed air during the process.
Answer» E.

Discussion

3.	What type of filter does not come under the Membrane filters?
A.	Ultra filtration
B.	Microfiltration
C.	Precoat (filter aid) filtration
D.	Nanofiltration
Answer» D. Nanofiltration

Discussion

4.	Microfiltration can be used to remove viruses.
A.	True
B.	False
Answer» C.

Discussion

5.	A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m³/ (m².d). The design capacity of the water works is 0.35 m³/s. The maximum surface per filter is limited to 50 m² and find out the normal filtration rate?
A.	154.3 m<sup>3</sup>/(m<sup>2</sup>.d)
B.	154.6 m<sup>3</sup>/(m<sup>2</sup>.d)
C.	155.6 m<sup>3</sup>/(m<sup>2</sup>.d)
D.	155.3 m<sup>3</sup>/(m<sup>2</sup>.d)
Answer» B. 154.6 m<sup>3</sup>/(m<sup>2</sup>.d)

Discussion

6.	A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m³/ (m².d). The design capacity of the water works is 0.35 m³/s. The maximum surface per filter is limited to 50 m². Design the number and size of filters. a)189 m², 4.78
A.	189 m<sup>2</sup>, 3.78
B.	167 m<sup>2</sup>, 2.66
C.	167 m<sup>2</sup>, 2.78
Answer» C. 167 m<sup>2</sup>, 2.78

Discussion

7.	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: (ft/lb) = ( p)^0.26, where = 2.90 10¹⁰
A.	nViscosity of the filtrate = 6.72 10<sup>-4</sup> lb/ft-s. Density of calcium carbonate = 168.8 lb/ft<sup>3</sup>. Neglect filter medium resistance.
B.	88 ft<sup>2</sup>
C.	86 ft<sup>2</sup>
D.	82 ft<sup>2</sup>
E.	90 ft<sup>2</sup>
Answer» D. 82 ft<sup>2</sup>

Discussion

8.	Filter aid can also be added to the fermentation broth to increase the porosity of the cake as it forms , what does this statement means?
A.	To increase the pH of the fermentation broth
B.	To decrease the filtration rate
C.	To decrease the pI of the fermentation broth
D.	To increase the filtration rate
Answer» E.

Discussion

Explore topic-wise MCQs in Bioprocess Engineering.

Which of the following do not comes under continuous filtration?

What do you mean by the term Backwashing ?

What type of filter does not come under the Membrane filters?

Microfiltration can be used to remove viruses.

A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m3/ (m2.d). The design capacity of the water works is 0.35 m3/s. The maximum surface per filter is limited to 50 m2 and find out the normal filtration rate?

A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m3/ (m2.d). The design capacity of the water works is 0.35 m3/s. The maximum surface per filter is limited to 50 m2. Design the number and size of filters.a)189 m2, 4.78

Filter aid can also be added to the fermentation broth to increase the porosity of the cake as it forms , what does this statement means?

A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m³/ (m².d). The design capacity of the water works is 0.35 m³/s. The maximum surface per filter is limited to 50 m² and find out the normal filtration rate?

A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 160 m³/ (m².d). The design capacity of the water works is 0.35 m³/s. The maximum surface per filter is limited to 50 m². Design the number and size of filters.
a)189 m², 4.78