GATE CH topic:process-engineering PYQs & Answers — Page 42

Questions 411–420 of 650. Imported answers require independent review unless marked reviewed.

Which one of the following is NOT CORRECT?

Your answerChoose one option.

nylon-6,6 is produced by condensation polymerization

phenol-formaldehyde resin is a thermosetting polymer

high density polyethylene (HDPE) is produced by condensation polymerization

poly(ethylene terephthalate) (PET) is a polyester

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The operating temperature range for the Haber process is 350–500 °C. It is used for the production of ammonia at

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20 MPa using Fe catalyst in an exothermic reaction

0.1 MPa using Fe catalyst in an exothermic reaction

20 MPa using Fe catalyst in an endothermic reaction

20 MPa using zeolite catalyst in an endothermic reaction

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Consider the refinery process in Group – 1 and the catalysts in Group – 2.

Group – 1 Group – 2 P Hydrodesulfurization I Zeolites Q Fluid catalytic cracking (FCC) II Pt/Al₂O₃ R Naphtha reforming III Co-Mo/Al₂O₃

The correct combination is

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P – II, Q – I, R – III

P – III, Q – II, R – I

P – III, Q – I, R – II

P – I, Q – III, R – II

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Consider the process in Group – 1 and the reactions in Group – 2.

Group – 1 Group – 2 P Solvay process I RCOOH + NaOH → RCOONa + H₂O Q Oxo process II CH₂=CH₂ + CO + H₂ → CH₃CH₂CHO R Saponification III CaCO₃ + 2NaCl → Na₂CO₃ + CaCl₂

The correct combination is

Your answerChoose one option.

P – II, Q – I, R – III

P – III, Q – II, R – I

P – III, Q – I, R – II

P – I, Q – III, R – II

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Annual capacity of a plant producing phenol is 100 metric tons. Phenol sells at INR 200 per kg, and its production cost is INR 50 per kg. The sum of annual fixed charges, overhead costs and general expenses is INR 30,00,000. Taxes are payable at 18% on gross profit. Assuming the plant runs at full capacity and that all the phenol produced is sold, the annual net profit of the plant (in INR) is

Your answerChoose one option.

1,39,40,000

1,50,00,000

98,40,000

1,20,00,000

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A rigid spherical particle undergoes free settling in a liquid of density 750 kg m⁻³ and viscosity 9.81 × 10⁻³ Pa s. Density of the particle is 300 kg m⁻³ and the particle diameter is 2 × 10⁻⁴ m. Acceleration due to gravity is 9.81 m s⁻². Assuming Stokes’ law to be valid, the terminal settling velocity (in m s⁻¹) of the particle is

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2 × 10⁻³

3 × 10⁻³

4 × 10⁻³

5 × 10⁻³

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Consider an incompressible flow of a constant property fluid over a smooth, thin and wide flat plate. The free stream flows parallel to the surface of the plate along its length and its velocity is constant. Value of the Reynolds number at a distance of 2.0 m from the leading edge of the plate is 800. The flow within the boundary layer at a distance of 1.0 m from the leading edge of the plate is

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laminar

turbulent

transitioning from laminar to turbulent

inviscid

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Ratio of momentum diffusivity to thermal diffusivity is

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Reynolds number

Prandtl number

Nusselt number

Peclet number

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Mole fraction and activity coefficient of component 1 in a binary liquid mixture are

and

, respectively.

is excess molar Gibbs energy of the mixture,

is universal gas constant and

is absolute temperature of the mixture. Which one of the following is always true?

Your answerChoose one option.

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Leidenfrost phenomenon refers to

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the condensation of vapour on a cold surface

the exchange of heat between two solids

the melting of frost

film boiling and evaporation of liquid droplets falling on a very hot surface

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GATE CH topic:process-engineering PYQs

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20