GATE CH topic:process-engineering PYQs & Answers — Page 33

Questions 321–330 of 650. Imported answers require independent review unless marked reviewed.

Information for a proposed greenfield project is provided in the table. The discounted cash flow for the fourth year is Rs ________ crores (rounded off to one decimal place).

Item	Value
Fixed capital investment (excluding land)	Rs 250 crores
Salvage value	Rs 0
Yearly revenue from product sales	Rs 120 crores
Yearly manufacturing cost (excluding depreciation)	Rs 30 crores
Interest rate	10% compounded annually
Annual taxation rate	30%
Depreciation method	Double declining balance over seven years
Plant start-up	2 years after project initiation

;

: years post start-up;

: Depreciation amount;

: Book value

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Consider the process in the figure. The liquid phase elementary reactions

occur in the continuous stirred tank reactor (CSTR), where

is the mole fraction of the

component (

) in the CSTR. It is given that

. All process feed, process exit and recycle streams are pure. At steady state, the net generation rate of the undesired product,

, in the CSTR is zero.

is varied at constant reactor temperature, the reactor volume is adjusted to maintain a constant single-pass conversion of

. For a fixed product rate and 90% conversion of

in the reactor, the value of

that minimizes the sum of the molar flow rates of the A and S recycle streams is ______ (round off to one decimal place).

Diagram for Chemical Engineering question 62

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An elementary irreversible liquid-phase reaction,

, is carried out under isothermal conditions in a

ideal plug flow reactor (PFR) as shown in the figure. The volumetric flow rate of fresh A,

and its concentration

. For a recycle ratio

, the conversion of A at location 2 with respect to the fresh feed (location 1) is 50%. For

, the corresponding conversion of A is _______% (rounded off to one decimal place).

Diagram for Chemical Engineering question 63

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An elementary irreversible gas-phase reaction,

, is carried out at fixed temperature and pressure in two separate ideal reactors: (i) a

plug flow reactor (PFR), (ii) a

continuous-stirred tank reactor (CSTR). If pure A is fed at

to the PFR operating at 400 K, the conversion is 80%. If a mixture of 50 mol% of A and 50 mol% of an inert is fed at

to the CSTR operating at 425 K, the conversion is 80%. The universal gas constant

. Assuming the Arrhenius rate law, the estimated activation energy is _______

(rounded off to one decimal place).

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An elementary irreversible liquid-phase reaction,

, where the rate constant

, takes place in an isothermal non-ideal reactor. The E-curve in a tracer experiment is shown in the figure. Pure P (

) is fed to the reactor. Using the segregated model, the percentage conversion of P at the exit of the reactor is _______% (rounded off to the nearest integer).

Diagram for Chemical Engineering question 65

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The ratio of boys to girls in a class is 7 to 3. Among the options below, an acceptable value for the total number of students in the class is:

Your answerChoose one option.

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A polygon is convex if, for every pair of points, P and Q belonging to the polygon, the line segment PQ lies completely inside or on the polygon. Which one of the following is NOT a convex polygon?

Your answerChoose one option.

Diagram for Chemical Engineering question 2

Diagram for Chemical Engineering question 2 (figure 2)

Diagram for Chemical Engineering question 2 (figure 3)

Diagram for Chemical Engineering question 2 (figure 4)

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Consider the following sentences: (i) Everybody in the class is prepared for the exam. (ii) Babu invited Danish to his home because he enjoys playing chess. Which of the following is the CORRECT observation about the above two sentences?

Your answerChoose one option.

(i) is grammatically correct and (ii) is unambiguous

(i) is grammatically incorrect and (ii) is unambiguous

(i) is grammatically correct and (ii) is ambiguous

(i) is grammatically incorrect and (ii) is ambiguous

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A circular sheet of paper is folded along the lines in the directions shown. The paper, after being punched in the final folded state as shown and unfolded in the reverse order of folding, will look like ______.