GATE CH topic:chemical-engineering PYQs & Answers — Page 63

Questions 621–630 of 650. Imported answers require independent review unless marked reviewed.

The following table provides four sets of Fanning friction factor data, for different values of Reynolds number (

) and roughness factor


	0	0.001	0	0.001
Set I,	0.16	0.016
Set II,	0.016	0.16	0.0055	0.0045
Set III,	0.16	0.016	0.0045	0.0055
Set IV,	0.0045	0.0055	0.016	0.16

Which of the above sets of friction factor data is correct?

Your answerChoose one option.

Set I

Set II

Set III

Set IV

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A propeller (diameter

m) rotates at

revolution per second (rps). To understand the flow around the propeller, a lab-scale model is made. Important parameters to study the flow are velocity of the propeller tip (

), diameter

and acceleration due to gravity (

). The lab-scale model is 1/100th of the size of the actual propeller. The rotation speed of the lab-scale model, to the nearest integer, should be ________ rps.

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Size analysis was carried out on a sample of gravel. The data for mass fraction (

) and average particle diameter (

) of the fraction is given in the table below:

	(mm)
0.2	5
0.4	10
0.4	20

The mass mean diameter of the sample, to the nearest integer, is ________ mm.

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Let

be the spectral blackbody radiation intensity per unit wavelength about the wavelength

. The blackbody radiation intensity emitted by a blackbody over all wavelengths is

Your answerChoose one option.

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A fluid flows over a heated horizontal plate maintained at temperature

. The bulk temperature of the fluid is

. The temperature profile in the thermal boundary layer is given by:

Here,

is the vertical distance from the plate,

is the thickness of the thermal boundary layer and

is the thermal conductivity of the fluid. The local heat transfer coefficient is given by

Your answerChoose one option.

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In nucleate boiling, the pressure inside a bubble is higher than the pressure of the surrounding liquid. Assuming that both the liquid and vapour are saturated, the temperature of the liquid will ALWAYS be

Your answerChoose one option.

at 100 °C

lower than the temperature of the vapour

equal to the temperature of the vapour

higher than the temperature of the vapour

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The vapor phase composition and relative volatilities (with respect to n-propane) on an ideal tray of a distillation column are

Component	Methane	Ethane	n-Propane
Mole fraction in vapor	0.12	0.28	0.60
Relative volatility	10	4	1

The mole fraction of n-propane in the liquid phase, rounded to 2 decimal places, is ____________.

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The Sherwood number (

) correlation for laminar flow over a flat plate of length

is given by

where

and

represent Reynolds number and Schmidt number, respectively. This correlation, expressed in the form of Chilton-Colburn

factor, is

Your answerChoose one option.

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In a countercurrent stripping operation using pure steam, the mole ratio of a solute in the liquid stream is reduced from 0.25 to 0.05. The liquid feed flowrate, on a solute-free basis, is 3 mol/s. The equilibrium line for the system is given in the figure below.

Diagram for Chemical Engineering question 44

The MINIMUM flowrate of pure steam for this process, rounded to 1 decimal place, is ______ mol/s.

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In a batch adsorption process, 5 g of fresh adsorbent is used to treat 1 liter of an aqueous phenol solution. The initial phenol concentration is 100 mg/liter. The equilibrium relation is given by

where

is the amount of phenol adsorbed in mg of phenol per gram of adsorbent, and

is the concentration of phenol in mg/liter in the aqueous solution. When equilibrium is attained between the adsorbent and the solution, the concentration of phenol in the solution, rounded to 1 decimal place, is __________ mg/liter.

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GATE CH topic:chemical-engineering PYQs

Question 36

Question 37

Question 38

Question 39

Question 40

Question 41

Question 42

Question 43

Question 44

Question 45