GATE CH year:2022 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

A control system on the jacket side of a reactor is shown in the figure. Pressurized water flows through the jacket to cool the reactor. The heated water flashes in the boiler. The exothermic reaction heat thus generates steam. Fresh boiler feed water (BFW) is added to make-up for the loss of water as steam. Assume that all control valves are air-to-open. The controller action, ‘direct’ or ‘reverse’, is defined with respect to the controller. Select the option that correctly specifies the action of the controllers.

Diagram for Chemical Engineering question 21

Your answerChoose one option.

PC: Reverse, LC: Direct, TC: Reverse

PC: Direct, LC: Reverse, TC: Direct

PC: Direct, LC: Reverse, TC: Reverse

PC: Reverse, LC: Direct, TC: Direct

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Liquid flowing through a heat exchanger (HX) is heated. A bypass stream is provided to control the temperature of the heated exit stream. From the given plumbing options, the one that provides the most effective temperature control for large disturbances while avoiding vaporization in the heat exchanger is

Your answerChoose one option.

Diagram for Chemical Engineering question 22

Diagram for Chemical Engineering question 22 (figure 2)

Diagram for Chemical Engineering question 22 (figure 3)

Diagram for Chemical Engineering question 22 (figure 4)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The appropriate feedforward compensator,

, in the shown block diagram is

Diagram for Chemical Engineering question 23

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Choose the option that correctly pairs the given measurement devices with the quantities they measure. The table lists: I — Bourdon Gauge; II — Orifice Plate meter; III — Pyrometer; IV — Colorimeter; V — Pirani Gauge. Quantities: A — Temperature; B — Concentration; C — Pressure; D — Flow rate; E — Liquid level.

Your answerChoose one option.

I-E II-C III-D IV-B V-A

I-C II-D III-A IV-B V-C

I-C II-D III-E IV-A V-D

I-D II-C III-A IV-E V-C

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A simple distillation column is designed to separate an ideal binary mixture to specified distillate and bottoms purities at a given column pressure. If RRₘᵢₙ is the minimum reflux ratio for this separation, select the statement that is NOT CORRECT with regard to the variation in the total annualized cost (TAC) of the column with reflux ratio (RR).

Your answerChoose one option.

TAC has a minimum with respect to RR

The sharpest rise in TAC occurs as RR approaches RRₘᵢₙ from above

The sharpest decrease in TAC occurs as RR approaches RRₘᵢₙ from above

TAC increases with RR for RR ≫ RRₘᵢₙ

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The reaction

is carried out isothermally on a porous catalyst. The intrinsic reaction rate is

, where

is the rate constant and

is the concentration of

. If the reaction is strong pore-diffusion controlled, the observed order of the reaction is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In an enzymatic reaction, an inhibitor (I) competes with the substrate (S) to bind with the enzyme (E), thereby reducing the rate of product (P) formation. The competitive inhibition follows the reaction mechanism shown below. Let [S] and [I] be the concentration of S and I, respectively, and

be the rate of consumption of S. Assuming pseudo-steady state, the correct plot of

Diagram for Chemical Engineering question 27

Your answerChoose one option.

Diagram for Chemical Engineering question 27 (figure 2)

Diagram for Chemical Engineering question 27 (figure 3)

Diagram for Chemical Engineering question 27 (figure 4)

Diagram for Chemical Engineering question 27 (figure 5)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The area of a circular field is 25 m

. The radius,

, is to be determined using the Newton-Raphson iterative method. For an initial guess of

m, the revised estimate of

after one iteration is ________ m (rounded off to three decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

5 moles of liquid benzene, 8 moles of liquid toluene and 7 moles of liquid xylene are mixed at 25 °C and 1 bar. Assuming the formation of an ideal solution and using the universal gas constant

J mol

, the total entropy change is ________ J K

(rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A perfectly insulated double pipe heat exchanger is operating at steady state. Saturated steam enters the inner pipe at 100 °C and leaves as saturated water at 100 °C. Cooling water enters the outer pipe at 75 °C and exits at 95 °C. The overall heat transfer coefficient is 1 kW m

and the heat transfer area is 1 m

. The average specific heat capacity of water at constant pressure is 4.2 kJ kg

. The required cooling water flow rate is ________ kg s

(rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE CH year:2022 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30