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Chemical Engineering Exam  >  Chemical Engineering Tests  >  Mass Transfer  >  Test: Flash Vaporization Line (Q-line) - Chemical Engineering MCQ

Test: Flash Vaporization Line (Q-line) - Chemical Engineering MCQ


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10 Questions MCQ Test Mass Transfer - Test: Flash Vaporization Line (Q-line)

Test: Flash Vaporization Line (Q-line) for Chemical Engineering 2024 is part of Mass Transfer preparation. The Test: Flash Vaporization Line (Q-line) questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Flash Vaporization Line (Q-line) MCQs are made for Chemical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Flash Vaporization Line (Q-line) below.
Solutions of Test: Flash Vaporization Line (Q-line) questions in English are available as part of our Mass Transfer for Chemical Engineering & Test: Flash Vaporization Line (Q-line) 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: Flash Vaporization Line (Q-line) | 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: Flash Vaporization Line (Q-line) - Question 1
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At what feed condition the slope of q line is infinity?

Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 1

Explanation: At saturated liquid the enthalpy of feed and the liquid is same so q=1 and slope = infinity.

Test: Flash Vaporization Line (Q-line) - Question 2
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Find the feed condition from the below distribution curve.

Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 2

Explanation: Since the slope of the q-line is between 1 and 0 it is a superheated vapour.

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Test: Flash Vaporization Line (Q-line) - Question 3
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In an operation the slope of the q-line is found to be 0; then the enthalpy of feed equals enthalpy of _____________

Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 3

Explanation: Slope of q line = q/q-1
If the enthalpy of feed and vapour are equal then the q becomes zero; q line also becomes zero.

Test: Flash Vaporization Line (Q-line) - Question 4
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Consider a saturated liquid-vapour mixture, if the liquid flow rate inside the enriching and the stripping section of a fractionator is 50 and 40 mol/hr. Also the feed rate is 10 mol/hr. Find the feed condition.
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 4

Explanation: q= 50-40/10 = 1; then the feed condition is a saturated liquid.

Test: Flash Vaporization Line (Q-line) - Question 5
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Find the liquid vapour compositions.
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 5

Explanation: From the feed condition we can estimate that the feed has a mixture of liquid and vapour. From the distribution diagram, the vapour composition is 60% and the liquid composition is 40%.

Test: Flash Vaporization Line (Q-line) - Question 6
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At what feed condition the slope of the flash vaporization line becomes 0?
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 6

Explanation: For a saturated vapour, the enthalpy of feed and the enthalpy of vapour is same so the value of q= 0; slope of q-line is 0.

Test: Flash Vaporization Line (Q-line) - Question 7
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The point where the operating line and the equilibrium line meets in distillation methods is known as
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 7

Explanation: At the pinch point, separation is not possible since it requires infinite number of trays in the enriching section if operating and equilibrium line meets.

Test: Flash Vaporization Line (Q-line) - Question 8
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Find the exact q line for the saturated liquid from the distribution diagram,
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 8

Explanation: For the saturated liquid, slope of q-line should be infinity.

Test: Flash Vaporization Line (Q-line) - Question 9
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 The equilibrium composition of liquid and vapour in a feed can be identified by,
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 9

Explanation: If the value of q is between 0 and 1 then the feed has both vapour and liquid. Then the compositions can be identified by intersecting q-line with operating line.

Test: Flash Vaporization Line (Q-line) - Question 10
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If the feed enters the distillation column at its dew point, then the slope of the Flash vaporization operating line is
Detailed Solution for Test: Flash Vaporization Line (Q-line) - Question 10

Explanation: If the feed at dew point means the feed condition is saturated vapour so the enthalpy of feed is same as the enthalpy of the vapour. Therefore the slope of the Q-line is 0. Since Q-line is the Flash vaporization operating line.

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Flash Vaporization Line (Q-line) MCQs with Answers

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