Chemical Engineering
2018 · Paper 1
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Complete GATE CH 2018 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.
Question 51
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A set of standard stainless steel pipes, each of internal diameter 26.65 mm and 600 mm length, is used to make a plug flow reactor by joining them in series to carry out degradation of polyethylene. Seven such pipes are required to obtain a conversion of 66% at 450 K. The minimum number of standard 800 mm long pipes of the same internal diameter to be procured for obtaining at least 66% conversion under the same reaction conditions is __________.
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Hydrogenation of benzene is to be carried out using Ni (density = 910 kg/m³) as catalyst, cast in the form of non-porous hollow cylinders, as shown below. The reaction occurs on all the surfaces of the hollow cylinder. During an experiment, one such cylinder is suspended in the reactant stream. If the observed rate of reaction is 0.39 mol (m² of catalyst surface)⁻¹ min⁻¹, then the rate of reaction in mol (kg of catalyst)⁻¹ min⁻¹ is ____________ (rounded off to three decimal places).
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The humidity of air at a dry-bulb temperature of 65 °C is 0.025 kg water/kg dry air. The latent heat of vaporization of water at 0 °C is 2500 kJ/kg. The psychrometric ratio of air is 0.95 kJ (kg dry air)⁻¹ K⁻¹. Considering 0 °C as reference temperature, the enthalpy of air (in kJ/kg) at its adiabatic saturation temperature of 35 °C is ____________ (rounded off to two decimal places).
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