GATE CH year:2021 PYQs & Answers — Page 7

Questions 61–65 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 7 of 7

The following homogeneous, irreversible reaction involving ideal gases,

is carried out in a steady state ideal plug flow reactor (PFR) operating at isothermal and isobaric conditions. The feed stream consists of pure A, entering at 2 m s

In order to achieve 50% conversion of A, the required length of the PFR is ________ meter (round off to 2 decimal places).

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A system has a transfer function

. When a step change of magnitude M is given to the system input, the final value of the system output is measured to be 120. The value of M is ________.

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A process has a transfer function

. Initially the process is at steady state with

and

. If a step change in x is given from 0.4 to 0.5, the maximum value of y that will be observed before it reaches the new steady state is ________ (round off to 1 decimal place).

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Operating labor requirements L in the chemical process industry is described in terms of the plant capacity C (kg day

) over a wide range (

–

) by a power law relationship

where

and

are constants. It is known that

is 60 when

is 70 when

The value of L when C is

kg day

is ________ (round off to nearest integer).

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A viscous liquid is pumped through a pipe network in a chemical plant. The annual pumping cost per unit length of pipe is given by

The annual cost of the installed piping system per unit length of pipe is given by

Here, D is the inner diameter of the pipe in meter, q is the volumetric flowrate of the liquid in m

and

is the viscosity of the liquid in Pa.s. If the viscosity of the liquid is

Pa.s and the volumetric flow rate of the liquid is

, the economic inner diameter of the pipe is ________ meter (round off to 3 decimal places).

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GATE CH year:2021 PYQs

Question 51

Question 52

Question 53

Question 54

Question 55