GATE CH topic:fluid-mechanics-and-mechanical-operations PYQs & Answers — Page 7

Questions 61–70 of 77. Imported answers require independent review unless marked reviewed.

A centrifugal pump is used to pump water (density 1000 kg/m³) from an inlet pressure of 10⁵ Pa to an exit pressure of 2×10⁵ Pa. The exit is at an elevation of 10 m above the pump. The average velocity of the fluid is 10 m/s. The cross-sectional area of the pipes at the pump inlet and outlet is 10⁻³ m² and acceleration due to gravity is

m/s². Neglecting losses in the system, the power (in Watts) delivered by the pump is ________ (rounded off to the nearest integer).

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The terminal velocity of a spherical particle in gravitational settling under Stokes’ regime varies

Your answerChoose one option.

linearly with the particle diameter

linearly with the viscosity of the liquid

directly with the square of particle diameter

inversely with the density of particle

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Critical speed of a ball mill depends on

Your answerChoose one option.

the radius of the mill (shell) and the radius of the particles

the radius of the mill (shell) and the density of the particles

the radius of the balls and the radius of the particles

the radius of the balls and the radius of the mill (shell)

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Pitot tube is used to measure

Your answerChoose one option.

liquid level in a tank

flow velocity at a point

angular deformation

vorticity

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A venturi meter is installed to measure the flow rate of water in a 178 mm diameter (ID) pipe. The throat diameter is 102 mm. The differential pressure measured using a manometer is 154.3 kN/m². The data given are: discharge coefficient = 0.98; water density = 1000 kg/m³.

The volumetric flow rate of water (in m³/s) is __________.

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Match the equipment in Column A with the corresponding process in Column B

Column A	Column B
(P) Centrifugal sifter	(I) Mixing
(Q) Bowl mill	(II) Sedimentation
(R) Gravity thickener	(III) Screening
(S) Two-arm kneader	(IV) Grinding

Your answerChoose one option.

P-I, Q-IV, R-II, S-III

P-III, Q-IV, R-II, S-I

P-IV, Q-I, R-II, S-III

P-IV, Q-III, R-I, S-II

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Under isothermal condition, a vertical tube of length L = 100 m contains a gas of molecular weight equal to 60. The pressure and temperature at the top of the tube are 100 kPa and 25 °C respectively. Consider the universal gas constant and acceleration due to gravity as 8.314 J mol⁻¹ K⁻¹ and 9.81 m s⁻² respectively. If the gas is ideal, the pressure (in kPa) at the bottom of the tube will be __________ (rounded off to third decimal place).

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At a shear rate of 10 s⁻¹, the apparent viscosity of a non-Newtonian liquid was found to be 1 Pa s. At a shear rate of 100 s⁻¹, the apparent viscosity of the same liquid was found to be 0.5 Pa s. If the liquid flows power law behavior, the apparent viscosity (in Pa s) at a shear stress of 10 N m⁻² is __________ (rounded off to two decimal place).

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In a roll crusher, rolls of diameter 1 m each are set in such a manner that minimum clearance between the crushing surfaces is 15 mm. If the angle of nip is 31°, the maximum diameter of the particle (in mm) which can be crushed is __________ (rounded off to third decimal place).

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In a venturi meter,

and

are the pressure drops corresponding to volumetric flowrates

and

. If

, then

equals

Your answerChoose one option.

0.5

0.25

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GATE CH topic:fluid-mechanics-and-mechanical-operations PYQs

Question 41

Question 5

Question 6

Question 22

Question 23

Question 26

Question 37

Question 38

Question 54

Question 8