GATE Overflow for GATE XE - Recent questions and answers in Mechanical Operations

GATE XE 2026 | Question: 126

Tue, 24 Feb 2026 15:31:18 +0000

Which one of the following statements is true for a high-pressure homogenizer?

Homogenization takes place only due to uniform mixing of solid and liquid
Solid particles in the suspension are disintegrated due to the high shear rate exerted by the liquid
High pressure steam is injected to dissolve the solids
Solid particles in the suspension are compressed into a cake under high pressure

GATE XE 2026 | Question: 140

Tue, 24 Feb 2026 15:25:24 +0000

During constant pressure cake filteration, for an incompressible cake deposited uniformly over a constant filter surface area,

the cake resistance remains constant
the cake resistance increases in proportion to the cake thickness
the filtration rate remains constant
the filtration rate decreases with time

GATE XE 2025 | Question: 153

Sun, 04 May 2025 15:30:15 +0000

In a typical grinding operation, $80 \%$ of the feed material passes through a sieve opening of $4.75 \: \mathrm{mm}$; whereas, $80 \%$ of the ground product passes through $0.5 \: \mathrm{mm}$ opening. If the power required to grind $2 \: \mathrm{tonnes} / \mathrm{h}$ of the feed material is $3.8 \: \mathrm{kW}$, the work index of the material is $\_\_\_\_\_\_\_$ (rounded off to $2$ decimal places)

GATE XE 2024 | Question: 140

Sun, 21 Jul 2024 16:40:51 +0000

Which of the following statements is/ are true?

Hagen-Poiseuille's law is used for calculation of molecular diffusion.
Fick's law is used for calculation of energy requirement in size reduction.
Rittinger's law is used for calculation of energy requirement in size reduction.
Stokes law is used for derivation of terminal velocity.

GATE XE 2023 | Question: 140

Wed, 14 Feb 2024 18:08:08 +0000

Q. 150 A hammer mill is used to grind blackgram. The size distribution of the blackgram is such that $80 \%$ passes through a $6-$ mesh (particle size $=3.36 \mathrm{~mm}$ ) screen. The power requirement to produce a powder, $80 \%$ of which passes through a 45 -mesh (particle size $=0.354 \mathrm{~mm}$ ) screen is $4.5 \mathrm{~kW}$. The power in $\mathrm{kW}$ required to produce a finer powder $80 \%$ of which passes through a $60-$ mesh (particle size $=0.25 \mathrm{~mm}$ ) will be (rounded off to 2 decimal places). Assume the feed rate to the mill is constant in both the cases. Use Bond's law of size reduction.