GATE ME 2026 Paper 1 — page 9

Questions 25–27 of 65. Imported answers require review unless explicitly marked reviewed.

An ideal gas passes isothermally through a long horizontal uniform cross-section pipe under steady flow. Consider that the pressure gradient in the pipe is sufficient for a finite change in the density of the gas. If the flow of the gas is purely pressure driven and subsonic throughout, then the average flow velocity

Your answerChoose one option.

increases along the flow

decreases along the flow

does not change throughout the pipe

increases in the hydrodynamic entrance region and then decreases thereafter

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Bernoulli’s equation CANNOT be applied between

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any two arbitrary points in the flow field for steady incompressible rotational flow

any two arbitrary points in the flow field for steady incompressible irrotational flow

any two points along a streamline for steady incompressible flow

any two points along a streamline for steady incompressible rotational flow

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A quiescent fluid at temperature

is confined between two vertical parallel plates. While plate 1 is kept at temperature

and plate 2 is maintained at temperature

, a velocity profile between the plates, as shown in the figure below, is generated due to heat transfer. Which one of the following options shows the correct relation among

, and

Diagram for Mechanical Engineering question 27

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and

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2026 · Paper 1

Question 25

Question 26

Question 27