Centrifugation Pharmaceutical engineering MCQ with answers
Pharm Engg Chapterwise MCQ: UNIT-I MCQ * Flow of fluids * Size reduction * Size separation UNIT-II MCQ *Heat transfer *Distillation *Evaporation UNIT-III MCQ *Drying * Mixing UNIT-IV MCQ * Filtration * Centrifugation * UNIT-V MCQ Materials of construction * Corrosion
If the amount of materials to be processed is huge and a low centrifugal effect is enough, then one of the following is economical to use
i. Large centrifuge operating at high speed
ii. Large centrifuge operating at low speed
iii. Small centrifuge operating at high speed
iv. Small centrifuge operating at low speed
i. Large centrifuge operating at high speed
ii. Large centrifuge operating at low speed
iii. Small centrifuge operating at high speed
iv. Small centrifuge operating at low speed
Answer: Large centrifuge operating at low speed
Which is the principle difference (in the properties) that influences centrifugation
i. Densities
ii. Interfacial tension
iii. Particle size
iv. Viscosities
i. Densities
ii. Interfacial tension
iii. Particle size
iv. Viscosities
Answer: Densities
A centrifugal method is used for one of the following forces
i. Mixing
ii. Purification
iii. Separation
iv. Sizing
i. Mixing
ii. Purification
iii. Separation
iv. Sizing
Answer: Separation
The centrifugal effect counteracts one of the following forces
i. Brownian forces
ii. Cohesive forces
iii. Electrostatic forces
iv. Gravitational forces
i. Brownian forces
ii. Cohesive forces
iii. Electrostatic forces
iv. Gravitational forces
Answer: Brownian forces
Which of the following centrifuges works against the gravitational acceleration?
i. Conical disc centrifuge
ii. Continuous horizontal centrifuge
iii. Perforated basket centrifuge
iv. Semi-continuous centrifuge
i. Conical disc centrifuge
ii. Continuous horizontal centrifuge
iii. Perforated basket centrifuge
iv. Semi-continuous centrifuge
Answer: Conical disc centrifuge
The solid that has high specific gravity remains in one of the following states in a centrifuge tube, once centrifugation is completed
i. Bottom
ii. Middle
iii. Top
iv. Uniform
i. Bottom
ii. Middle
iii. Top
iv. Uniform
Answer: Bottom
Which one of the following forces greatly enhances the separation forces?
i. Brownian forces
ii. Centrifugal forces
iii. Gravitational forces
iv. Van der Waals forces
i. Brownian forces
ii. Centrifugal forces
iii. Gravitational forces
iv. Van der Waals forces
Answer: Centrifugal forces
The centrifugal effect is expressed in one of the following ratios
i. Centrifugal force to a density of liquid
ii. Centrifugal force to gravitational force
iii. Centrifugal force to sedimentation force
iv. Gravitation force to sedimentation force
i. Centrifugal force to a density of liquid
ii. Centrifugal force to gravitational force
iii. Centrifugal force to sedimentation force
iv. Gravitation force to sedimentation force
Answer: Centrifugal force to gravitational force
What are the two factors responsible for separation by centrifugation?
i. Density & sedimentation force
ii. Density & speed of rotation
iii. Diameter & speed of rotation
iv. Speed of rotation & sedimentation force
i. Density & sedimentation force
ii. Density & speed of rotation
iii. Diameter & speed of rotation
iv. Speed of rotation & sedimentation force
Answer: Diameter & speed of rotation
Centrifugation is useful in one of the following types of dispersions
i. Coarse dispersions
ii. Colloidal dispersions
iii. Molecular dispersions
iv. Multi – Size dispersions
i. Coarse dispersions
ii. Colloidal dispersions
iii. Molecular dispersions
iv. Multi – Size dispersions
Answer: Colloidal dispersions
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