2022 · Paper 1

Complete GATE CH 2022 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

Question 61

Open question

CHNAT2 marksNeeds review

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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Question 62

Open question

CHNAT2 marksNeeds review

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).



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Question 63

Open question

CHNAT2 marksNeeds review

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).



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