GATE CH kind:question PYQs & Answers — Page 59

Questions 581–590 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 59 of 65

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).

Diagram for Chemical Engineering question 52

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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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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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A hot liquid is to be cooled in a 1-1 shell and tube heat exchanger from 80 °C to 50 °C. Cooling water enters the tube side at 30 °C, and exits at 45 °C. The properties of the liquids are constant. Also, the overall heat transfer coefficient is same for counter-current and co-current modes. The percentage saving in heat transfer area for counter-current option with respect to the area of co-current option is __________ (rounded off to third decimal place).

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The value of

is _____.

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The real part of

is _____.

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The number of positive roots of the function

shown below in the range

is .

Diagram for Chemical Engineering question 3

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Let i and j be the unit vectors in the x and y directions, respectively. For the function

the gradient of the function, i.e.,

is given by

Your answerChoose one option.

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The marks obtained by a set of students are: 38, 84, 45, 70, 75, 60, 48. The mean and median marks, respectively, are

Your answerChoose one option.

45 and 75

55 and 48

60 and 60

60 and 70

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GATE CH kind:question PYQs

Question 51

Question 52

Question 53

Question 54

Question 55

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Question 2

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Question 5