# Separation Processes Questions and Answers – Bioproduct Crystallization

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This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Bioproduct Crystallization”.

1. What does the Attrition mean?
a) Coalescence of molecules
b) Collision of solid crystals with each other
c) Breakup of existing crystals in new particles
d) Mechanism that gives different crystal size distributions

Explanation: The term attrition refers to breakup of existing crystals in new particles.

2. What does the term contact nucleation?
a) Coalescence of molecules
b) Collision of solid crystals with each other
c) Breakup of existing crystals in new particles
d) Mechanism that gives different crystal size distributions

Explanation: The term contact nucleation refers to collision of solid crystals with one another.

3. What does the term chronomals refer to?
a) Coalescence of molecules
b) Collision of solid crystals with each other
c) Breakup of existing crystals in new particles
d) Mechanism that gives different crystal size distributions

Explanation: Chronomals refer to the mechanism that gives different crystal size distribution.

4. Find out the characteristic crystal length if
Mass of the crystal m= 10g
Density of crystal is d= 5g/m3
Area of crystal A= 10m2
a) 1.2m
b) 1.4
c) 1m
d) 2m

Explanation: Since L= 6m/dA, L= 1.2m.

5. Find out the characteristic crystal length if
Mass of the crystal m= 10g
Density of crystal is d= 6g/m3
Area of crystal A= 10m2
a) 1.2m
b) 1.4
c) 1m
d) 2m

Explanation: Since L= 6m/dA, L= 1m.

6. Find out the characteristic crystal length if
Mass of the crystal m= 16.67g
Density of crystal is d= 5g/m3
Area of crystal A= 10m2
a) 1.2m
b) 1.4
c) 1m
d) 2m

Explanation: Since L= 6m/dA, L= 2m.

7. Find out the characteristic crystal length if
Mass of the crystal m= 10g
Density of crystal is d= 2g/m3
Area of crystal A= 10m2
a) 1.2m
b) 3m
c) 1m
d) 2m

Explanation: Since L= 6m/dA, L= 3m.

8. Find out the characteristic crystal length if
Mass of the crystal m= 10g
Density of crystal is d= 1g/m3
Area of crystal A= 10m2
a) 1.2m
b) 1.4
c) 1m
d) 6m

Explanation: Since L= 6m/dA, L= 6m.

9. Find out the characteristic crystal length if
Mass of the crystal m= 10g
Density of crystal is d= 4g/m3
Area of crystal A= 10m2
a) 1.2m
b) 1.5m
c) 1m
d) 2m

Explanation: Since L= 6m/dA, L= 1.5m.

10. Find out the characteristic crystal length if
Mass of the crystal m= 10g
Density of crystal is d= 9g/m3
Area of crystal A= 10m2
a) 0.33m
b) 0.66m
c) 0.69m
d) 0.56m 