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Chemical Engineering Exam  >  Chemical Engineering Tests  >  Mass Transfer  >  Test: Operating Line Concept For Absorption - Chemical Engineering MCQ

Test: Operating Line Concept For Absorption - Chemical Engineering MCQ


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10 Questions MCQ Test Mass Transfer - Test: Operating Line Concept For Absorption

Test: Operating Line Concept For Absorption for Chemical Engineering 2024 is part of Mass Transfer preparation. The Test: Operating Line Concept For Absorption questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Operating Line Concept For Absorption MCQs are made for Chemical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Operating Line Concept For Absorption below.
Solutions of Test: Operating Line Concept For Absorption questions in English are available as part of our Mass Transfer for Chemical Engineering & Test: Operating Line Concept For Absorption solutions in Hindi for Mass Transfer course. Download more important topics, notes, lectures and mock test series for Chemical Engineering Exam by signing up for free. Attempt Test: Operating Line Concept For Absorption | 10 questions in 20 minutes | Mock test for Chemical Engineering preparation | Free important questions MCQ to study Mass Transfer for Chemical Engineering Exam | Download free PDF with solutions
Test: Operating Line Concept For Absorption - Question 1
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Spray tower is a _______ process.

Detailed Solution for Test: Operating Line Concept For Absorption - Question 1

Explanation: Here, the gas is passed through bottom and the liquid is sprayed at the top.

Test: Operating Line Concept For Absorption - Question 2
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Find the rate of non-diffusing solute, if the mole fraction of the gas phase is 0.65 and the diffusing rate is 70 moles/hr.

Detailed Solution for Test: Operating Line Concept For Absorption - Question 2

Explanation: Gs= G(1-y)
=70 x(1-0.65)
=24.5 moles/hr

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Test: Operating Line Concept For Absorption - Question 3
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In an absorber, lower denser materials are sent through the bottom and the higher denser materials are sent through top

Detailed Solution for Test: Operating Line Concept For Absorption - Question 3

Explanation: For reducing the pumping cost and to create sufficient pressure drop.

Test: Operating Line Concept For Absorption - Question 4
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Stripper= (1/X)
Find X?
Detailed Solution for Test: Operating Line Concept For Absorption - Question 4

Explanation: Stripper is liquid to gas transfer but absorber is gas to liquid transfer.

Test: Operating Line Concept For Absorption - Question 5
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Find the representation

Where, Y- gas phase concentration in mole ratio
X-liquid phase concentration in mole ratio 
Detailed Solution for Test: Operating Line Concept For Absorption - Question 5

Explanation: For stripper, the solute gets transfer from liquid to gas so the operating line is below equilibrium line.

Test: Operating Line Concept For Absorption - Question 6
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Find the slope of the operating line

Here, the concentrations are represented in mole ratio. The value of (Y1-Y2)/(X1-X2) =2. Find the slope of the operating line.
Detailed Solution for Test: Operating Line Concept For Absorption - Question 6

Explanation: For a counter current process, Y1- Y2 = Ls/Gs(X1-X2)
Ls/Gs= slope of the operating line = 2

Test: Operating Line Concept For Absorption - Question 7
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 Have a look on the below diagram

Here, DE and DP are the operating line. Also Y and X are the concentrations in mole ratio for gas and liquid phase.
It’s clearly a representation of an absorber. For the operating line DE minimum liquid is required 
Detailed Solution for Test: Operating Line Concept For Absorption - Question 7

Explanation: DP line requires minimum liquid because the composition is increased to X2.

Test: Operating Line Concept For Absorption - Question 8
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 If the operating line touches the equilibrium line, the separation is possible in an absorber.
Detailed Solution for Test: Operating Line Concept For Absorption - Question 8

Explanation: At that point, the slope of operating line will be equals to the slope of equilibrium line. So the Absorption factor becomes equal to one, the separation is not possible.

Test: Operating Line Concept For Absorption - Question 9
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 For the Absorber design the plotting with mole ratio helps to find the
Detailed Solution for Test: Operating Line Concept For Absorption - Question 9

Explanation: The plot with mole fraction will give an operating line as a curve; it will be very difficult to find the slope of the operating line. Therefore the use of mole ratio plot will give us a liner operating line.

Test: Operating Line Concept For Absorption - Question 10
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Given for an absorber, the minimum non diffusing liquid flow rate is 20 moles/hr and the non diffusing gas flow rate is 30 moles/hr. As the actual liquid flow rate is 2.5 times the minimum. Find the slope of operating line.
Detailed Solution for Test: Operating Line Concept For Absorption - Question 10

Explanation: Ls= 2.5 (Ls min)
Slope= (2.5 x 20)/30 =1.67

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