GATE CH 2021 Paper 1 — page 13

Questions 37–39 of 65. Imported answers require review unless explicitly marked reviewed.

Consider a fluid confined between two horizontal parallel plates and subjected to shear flow. In the first experiment, the plates are separated by a distance of 1 mm. It is found that a shear stress of 2 N m

has to be applied to keep the top plate moving with a velocity of 2 m s

, while the other plate is fixed. In the second experiment, the plates are separated by a distance of 0.25 mm. It is found that a shear stress of 3 N m

has to be applied to keep the top plate moving with a velocity of 1 m s

, while the other plate is fixed. In the range of shear rates studied, the rheological character of the fluid is

Your answerChoose one option.

Newtonian

Pseudoplastic

Dilatant

Ideal and inviscid

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Water of density 1000 kg m

flows in a horizontal pipe of 10 cm diameter at an average velocity of 0.5 m s

. The following plot shows the pressure measured at various distances from the pipe entrance.

Diagram for Chemical Engineering question 28

Using the data shown in the figure, the Fanning friction factor in the pipe when the flow is FULLY DEVELOPED is

Your answerChoose one option.

0.0012

0.0074

0.0082

0.0106

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In a solvent regeneration process, a gas is used to strip a solute from a liquid in a countercurrent packed tower operating under isothermal condition. Pure gas is used in this stripping operation. All solutions are dilute and Henry’s law,

, is applicable. Here,

is the mole fraction of the solute in the gas phase in equilibrium with the liquid phase of solute mole fraction

, and

is the Henry’s law constant. Let

be the mole fraction of the solute in the leaving liquid, and

be the mole fraction of solute in the entering liquid. When the value of the ratio of the liquid-to-gas molar flow rates is equal to

, the overall liquid phase Number of Transfer Units, NTU

, is given by

Your answerChoose one option.

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2021 · Paper 1

Question 27

Question 28

Question 29