GATE CH Fluid Mechanics and Mechanical Operations PYQs & Answers — Page 8

Questions 71–77 of 77. Imported answers require independent review unless marked reviewed.

The thickness of laminar boundary layer over a flat plate varies along the distance from the leading edge of the plate. As the distance increases, the boundary layer thickness

Your answerChoose one option.

increases

decreases

initially increases and then decreases

initially decreases and then increases

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Which of the following is the correct sequence of equipment for size reduction of solids?

Your answerChoose one option.

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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A gas bubble (gas density

kg/m³; bubble diameter

m) is rising vertically through water (density

kg/m³; viscosity

Pa.s). Force balance on the bubble leads to the following equation,

where

is the velocity of the bubble at any given time

. Assume that the volume of the rising bubble does not change. The value of

m/s².

The terminal rise velocity of the bubble (in cm/s), rounded to 2 decimal places, is ______ cm/s.

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Oil is being delivered at a steady flowrate through a circular pipe of radius

m and length 10 m. The pressure drop across the pipe is 500 Pa. The shear stress at the pipe wall, rounded to 2 decimal places, is __________ Pa.

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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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GATE CH Fluid Mechanics and Mechanical Operations PYQs

Question 9

Question 10

Question 11

Question 35

Question 36

Question 37

Question 38