Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s – Equipment for Solvent Extraction(a)
1 - Question
Solvent extraction is more effective when the extraction is repeated with:
a) Extra solvent
b) Large solvent
c) Small solvent
d) No solvent
Explanation: Solvent extraction is more effective when the extraction is repeated with small solvent.
2 - Question
When the component has a small value of K, it is supposed to have an affinity for:
a) Mobile phase
b) No phase
c) Stationary phase
d) Whole solution
Explanation: The component has a small value of K, it is supposed to have an affinity for stationary phase.
3 - Question
What is the use of ether layer?
a) To separate organic impurities
b) To separate inorganic impurities
c) To separate fibres
d) TO separate solvent
Explanation: Since ether is a non-polar compound, its layer is used to separate organic impurities
4 - Question
A mobile phase cannot be a :
d) Solid or gas
Explanation: A mobile phase has to flow and hence it should not be a solid.
5 - Question
What is the representation of distribution coefficient?
Explanation: The distribution coefficient is denoted by K.
6 - Question
What is the colour post extraction of iodine?
Explanation: The colour after extracting iodine is purple.
7 - Question
The dispersed phase is also called as:
a) Non-continuous phase
b) Continuous phase
c) Dis-continuous phase
d) Gas phase
Explanation: The dispersed phase is also called as dis-continuous phase, the other phase being continuous phase.
8 - Question
What is true about mixer settlers?
a) Two liquid phases mixed with impellers and separated by gravity induced separation.
b) Two liquid phases unmixed, and magnetic separation carried out
c) Two liquid phases are mixed by impellers, and separated using magnetic separation
d) Two liquid phases are heated to mix, and gravity induced separation is carried out
Explanation” In mixer settlers, two liquid phases mixed with impellers and separated by gravity induced separation.
9 - Question
The dispersed phase is:
d) May be heavier or lighter
Explanation: The dispersed phase formed by mixing maybe a heavier or a lighter phase.
10 - Question
What is the major problem in settlers?
a) Colour of the two phases may be same
b) The two phases may not be visible
c) Emulsification in the mixing wheel
d) The size of dispersed particles can be large
Explanation: If the agitation is very intense, then the size of particles can reduce to 1 to 1.5 micrometers. Thus there could be emulsification, and it is problematic.