This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Centrifuge Devices for Solid Liquid Separations”.
1. What are the two general types of centrifuge devices for solid-liquid separations?
a) Sedimentation centrifuges, filtering centrifuges
b) Sedimentation centrifuges, decantation centrifuges
c) Filtering centrifuges, sintering centrifuges
d) Sedimentation centrifuges, two way centrifuges
View Answer
Explanation: The two general types of centrifuge devices for solid-liquid separations are Sedimentation centrifuges, filtering centrifuges.
2. What is the use of tubular-bowl centrifuge?
a) To separate soap from oil
b) To separate waste material
c) To separate cells and viruses from broth
d) To separate salts from mixtures
View Answer
Explanation: The tubular-bowl centrifuge is used to separate cells and viruses from broth.
3. In which industry tubular-bowl centrifuge not used?
a) Food industry
b) Pharma industry
c) Biochemical industry
d) Metallurgical industry
View Answer
Explanation: The tubular-bowl centrifuge is used to separate cells and viruses from broth and hence has no use in the metal industry.
4. When is the basket-filtering centrifuge not used?
a) Solids are main product
b) Low cake moisture content
c) High solid recovery desired
d) High liquid recovery desired
View Answer
Explanation: When high liquid recovery is desired, basket filtering centrifuge is not used.
5. Why are gravity separators not used in bioseparations?
a) Because density differences are very large
b) Because density differences are very small
c) Because gravity separators are too small
d) Because the cultures get damaged
View Answer
Explanation: Gravity separators are not used in bioseparations because density differences are very small.
6. Calculate the sigma factor for the following operating conditions
Bowl length L=0.1m
Rotation rate n=2000/s
R0=0.02m, R1=0.01m
a) 50
b) 55
c) 111
d) 165
View Answer
Explanation: Sigma factor= Lω2(R02-R12)/gln(R0/R1), hence sigma factor= 55m.
7. Calculate the sigma factor for the following operating conditions
Bowl length L=0.2m
Rotation rate n=2000/s
R0=0.02m, R1=0.01m
a) 50
b) 55
c) 111
d) 165
View Answer
Explanation: Sigma factor= Lω2(R02-R12)/gln(R0/R1), hence sigma factor= 111m.
8. Calculate the sigma factor for the following operating conditions
Bowl length L=0.3m
Rotation rate n=2000/s
R0=0.02m, R1=0.01m
a) 50
b) 55
c) 111
d) 165
View Answer
Explanation: Sigma factor= Lω2(R02-R12)/gln(R0/R1), hence sigma factor= 111m.
9. Calculate the sigma factor for the following operating conditions
Bowl length L=0.05m
Rotation rate n=2000/s
R0=0.02m, R1=0.01m
a) 27
b) 55
c) 111
d) 165
View Answer
Explanation: Sigma factor= Lω2(R02-R12)/gln(R0/R1), hence sigma factor= 27m.
10. Calculate the sigma factor for the following operating conditions
Bowl length L=0.1m
Rotation rate n=4000/s
R0=0.02m, R1=0.01m
a) 323
b) 212
c) 234
d) 222
View Answer
Explanation: Sigma factor= Lω2(R02-R12)/gln(R0/R1), hence sigma factor= 222m.
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