This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Extraction Equipments”.
1. __________ is the single stage device in extractor types.
a) Mixer settler
b) Sieve trays
c) Agitator vessel
d) Packed column
View Answer
Explanation: Mixer-settler is a single stage device used for extraction operation.
2. Settler in the mixer settler is applicable for rapid agitation.
a) True
b) False
View Answer
Explanation: Settler is used for settling.
3. The substance to get mixed enters into the mixer through.
a) Orifice
b) Nozzle
c) Orifice or nozzle
d) None of the mentioned
View Answer
Explanation: Orifice or nozzle both are used for allowing the substance into the mixer.
4. Line mixers are ________
a) Small
b) Large
c) Very high
d) None of the mentioned
View Answer
Explanation: Line mixers or flow mixers are used inside pipes so it must be small.
5. The two liquids while mixing gets dispersed inside the mixer.
a) True
b) False
View Answer
Explanation: Due to the loss of energy by pressure drop the liquids gets dispersed inside the mixer.
6. If the holding time is more in a mixer then _______ will be poor.
a) Mass transfer
b) Heat transfer
c) Momentum transfer
d) Both mass and momentum transfer
View Answer
Explanation: If the holding of liquids inside the mixer is poor then the rate of mass transfer gets decrease.
7. More than three stages of mixer settler attached to get _____________
a) Multi-component cascade
b) Mixer settler cascade
c) Extraction multi-stages
d) None of the mentioned
View Answer
Explanation: Generally two or more stages inter connected to form cascades so it is an mixer settler cascades.
8. The extractor preferred for getting immediate dispersion after piping is ___________________
a) Don extractor
b) Box extractor
c) Boltzmann extractor
d) Immediate dispersion is not possible
View Answer
Explanation: The box arrangement of alternate stages produces immediate dispersion.
9. If a system has low interfacial tension _________ extractor is preferred.
a) Packed column
b) Pulse column
c) Sieve plates
d) Agitator column
View Answer
Explanation: For a system with low interfacial tension need not need mechanical agitation so sieve plates are preferred.
10. _____________ mixing is applicable for differential contractors.
a) Axial
b) Radial
c) Both axial and radial
d) None of the mentioned
View Answer
Explanation: Due to the reduction of concentration difference between the phases axial mixing is preferred.
11. Packed tower with ________ packing preferable for liquid extraction.
a) Uniform
b) Random
c) Complete
d) None of the mentioned
View Answer
Explanation: To reduce axial mixing random packing are preferred in a packed column.
12. Motivational force in a differential contractor is
a) Centrifugal force
b) Gravitational force
c) Electromagnetic forces
d) All of the mentioned
View Answer
Explanation: In extractor the light liquid enters the bottom and also the extractor is vertical so gravitational force is a motivational force.
13. The high density difference among the liquid in the extractor cause ________
a) Flooding
b) Loading
c) Agitation
d) None of the mentioned
View Answer
Explanation: Generally, the density difference leads to separation from each other which results in flooding.
14. Differential contractors are continuous extractor.
a) True
b) False
View Answer
Explanation: Differential contractor was named because of continuous contact of entering and leaving streams.
15. Find the process.
a) Batch process
b) Continuous process
c) Batch+ continuous process
d) None of the mentioned
View Answer
Explanation: Mixer is a batch process and settler is a continuous process.
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