GATE CH format:msq PYQs & Answers — Page 2

Questions 11–20 of 20. Imported answers require independent review unless marked reviewed.

If the Prandtl number

, which of the following statements is/are correct?

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The moment diffusivity is much larger than the thermal diffusivity.

The thickness of the momentum boundary layer is much smaller than that of the thermal boundary layer.

The thickness of the momentum boundary layer is much larger than that of the thermal boundary layer.

The momentum diffusivity is much smaller than the thermal diffusivity.

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For the electrolytic cell in a chlor-alkali plant, which of the following statements is/are correct?

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A membrane cell operates at a higher brine concentration than a diaphragm cell.

Chlorine gas is produced at the cathode.

Hydrogen gas is produced at the cathode.

The caustic product stream exits the anode compartment.

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Which of the following statements with reference to the petroleum/petrochemical industry is/are correct?

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Catalytic hydrocracking converts heavier hydrocarbons to lighter hydrocarbons.

Catalytic reforming converts straight-chain hydrocarbons to aromatics.

Cumene is manufactured by the catalytic alkylation of benzene with propylene.

Vinyl acetate is manufactured by reacting methane with acetic acid over a palladium catalyst.

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Consider a system where a Carnot engine is operating between a source and a sink. Which of the following statements about this system is/are NOT correct?

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This engine is reversible.

The engine efficiency is independent of the source and sink temperatures.

This engine has the highest efficiency among all engines that operate between the same source and sink.

The total entropy of this system increases at the completion of each cycle of the engine.

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For a fully developed turbulent flow of an incompressible Newtonian fluid through a pipe of constant diameter, which of the following statements is/are CORRECT?

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Reynolds stress, averaged over a sufficiently long time, is zero everywhere inside the pipe.

Reynolds stress at the pipe wall is zero.

Average velocity of the fluid is half of its center-line velocity.

Average pressure gradient in the flow direction is constant.

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Given that

(in W·m

) is the total hemispherical emissive power of a surface maintained at a certain temperature, which of the following statements is/are CORRECT?

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does not depend on the direction of the emission.

depends on the viewer.

depends on the wavelength of the emission.

does not depend on the frequency of the emission.

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Which of the following statements is/are CORRECT?

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Bond number includes surface tension.

Jakob number includes latent heat.

Prandtl number includes liquid-vapor density difference.

Biot number includes gravity.

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For the function

the CORRECT statement(s) is/are

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is continuous at

is differentiable at

is continuous at

is differentiable at

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Feed solution F is contacted with solvent B in an extraction process. Carrier liquid in the feed is A and the solute is C. The ternary diagram depicting a single ideal stage extraction is given below. The dashed lines represent the tie-lines.

Diagram for Chemical Engineering question 17

The CORRECT option(s) is/are

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For the tie-lines shown, concentration of solute in the extract is higher than that in the raffinate

Maximum amount of solvent is required if the mixture composition is at W

Y represents the composition of extract when minimum amount of solvent is used

U represents the raffinate composition if the mixture composition is at M

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The inherent characteristics of three control valves P, Q and R are shown in the figure.

Diagram for Chemical Engineering question 18

The CORRECT option(s)) is/are

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P is a quick opening valve

Q is a quick opening valve

P is an equal percentage valve

R is an equal percentage valve

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GATE CH format:msq PYQs

Question 27

Question 28

Question 29

Question 28

Question 29

Question 30

Question 46

Question 16

Question 17

Question 18