Chemical Engineering
2026 · Paper 1
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Complete GATE CH 2026 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.
Question 58
Open questionCHNAT2 marksNeeds review
A gas mixture of 50 wt. % argon and 50 wt. % helium flowing through a horizontal tube of uniform diameter at a rate of 1 kg s⁻¹ is heated from 300 K to 400 K at 1 bar. Neglect shaft work, and changes in kinetic as well as potential energies between the inlet and the outlet. Assume the mixture exhibits ideal gas behavior. The specific enthalpies of the components are given in the following table.
Component | Specific enthalpy (kJ kg⁻¹) at 300 K | Specific enthalpy (kJ kg⁻¹) at 400 K |
|---|---|---|
Argon | 348 | 400 |
Helium | 1574 | 2092 |
At steady state, the heat input required (in kW) is __________ (rounded off to the nearest integer).
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Open questionCHNAT2 marksNeeds review
When a cylindrical capillary glass tube, open at both ends, is vertically inserted in a pool of water, the water level in the tube rises to 7 cm relative to the water level outside the tube. Consider that the surface tension of water is 0.07 N m⁻¹ and that the contact angle of water on glass is 0°. The density of water is 1000 kg m⁻³, and the local acceleration due to gravity is 10 m s⁻². The diameter of the capillary tube (in μm) is __________ (rounded off to the nearest integer).
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Open questionCHNAT2 marksNeeds review
Consider a two-dimensional, steady, laminar flow of an incompressible fluid with zero pressure gradient, over a thin horizontal flat plate of length 2 m. The free stream velocity is 1 m s⁻¹. A boundary layer thickness of 1 mm is observed at a distance of 0.25 m from the leading edge of the plate. At 1 m from the leading edge, the boundary layer thickness (in mm) is ________ (rounded off to the nearest integer).
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