GATE CH purpose:exam-prep PYQs & Answers — Page 48

Questions 471–480 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 48 of 65

For a fully-developed turbulent hydrodynamic boundary layer for flow past a flat plate, the thickness of the boundary layer increases with distance

from the leading edge of the plate, along the free-stream flow direction, as

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Consider a cylinder (diameter

and length

), a sphere (diameter

) and a cube (side length

). Which of the following statements concerning the sphericity (

) of the above objects is true:

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Prandtl number signifies the ratio of

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Momentum Diffusivity / Thermal Diffusivity

Mass Diffusivity / Thermal Diffusivity

Thermal Diffusivity / Momentum Diffusivity

Thermal Diffusivity / Mass Diffusivity

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Pool boiling equipment operating above ambient temperature is usually designed to operate

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for above the critical heat flux

near the critical heat flux

for above the Leidenfrost point

near the Leidenfrost point

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The desired liquid-phase reaction

is accompanied by an undesired side reaction

Four isothermal reactor schemes (CSTR: ideal Continuous-Stirred Tank Reactor; PFR: ideal Plug Flow Reactor) for processing equal molar feed rates of D and E are shown in figure. Each scheme is designed for the same conversion. The scheme that gives the most favorable product distribution is:

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Diagram for Chemical Engineering question 10

Diagram for Chemical Engineering question 10 (figure 2)

Diagram for Chemical Engineering question 10 (figure 3)

Diagram for Chemical Engineering question 10 (figure 4)

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For a first order reaction in a porous spherical catalyst pellet, diffusional effects are most likely to lower the observed rate of reaction for

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slow reaction in a pellet of small diameter

slow reaction in a pellet of large diameter

fast reaction in a pellet of small diameter

fast reaction in a pellet of large diameter

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A thermocouple senses temperature based on the

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Nernst Effect

Maxwell Effect

Seebeck Effect

Peltier Effect

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The correct expression for the Colburn

-factor for mass transfer that relates Sherwood number (Sh), Reynolds number (Re) and Schmidt number (Sc) is

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In the drying of non-dissolving solids at constant drying conditions, the internal movement of moisture in the solid has a dominant effect on the drying rate during

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the initial adjustment period only

the constant rate period only

the falling rate period only

both the initial adjustment and constant rate periods

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Three distillation schemes for separating an equimolar, constant relative volatility ABC mixture into nearly pure components are shown. The usual simplifying assumptions such as constant molal overflow, negligible heat loss, ideal trays are valid. All the schemes are designed for minimum total reboiler duty. Given that the relative volatilities are in the ratio

, the correct option that arranges the optimally-designed schemes in ascending order of total reboiler duty is

Diagram for Chemical Engineering question 15

Your answerChoose one option.

I, II, III

III, I, II

II, I, III

III, II, I

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GATE CH purpose:exam-prep PYQs

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15