Chemical Engineering
GATE CH Plant Design and Economics PYQs
Build your understanding with focused practice from past exam papers.
How to practice Plant Design and Economics
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 27. Imported answers require independent review unless marked reviewed.
Question 29
Open questionCHMSQ1 markNeeds review
Which of the following methods for calculating profitability does/do NOT consider the time value of money?
Your answerSelect all correct options. You can choose more than one.
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Open questionCHMCQ2 marksNeeds review
In a certain project, 15% of the total investment is the working capital. The minimum acceptable rate of return is 4.95% and the period of evaluation is 15 years. Which one of the following is the maximum acceptable project payback period (in years)?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 26
Open questionCHMCQ1 markNeeds review
The capital cost (
) of an industrial equipment varies with its capacity (
) as
. The rule-of-thumb value of the exponent
isYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 63
Open questionCHNAT2 marksNeeds review
It is proposed to install thermal insulation in a residence to save on the summer-monsoon season air-conditioning costs. The estimated yearly saving is 20 thousand rupees. The cost of installation of the insulation is 150 thousand rupees. The life of the insulation is 12 years. For a compound interest rate of 9% per annum, the minimum salvage value of the insulation for which the proposal is competitive, is ____ thousand rupees (rounded off to nearest integer).
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Open questionCHNAT2 marksNeeds review
Consider the flowsheet in the figure for manufacturing
via the reaction
in an isothermal CSTR. The split in the separator is perfect so that the recycle stream is free of
and the product stream is pure
. Let
denote the mole fraction of species
(
) in the CSTR, which is operated in excess
with
. The reaction is first-order in
with the reaction rate
, where
kmol/(m
h).
The reactor volume
in m
is to be optimized to minimize the cost objective
, where
is the recycle rate in kmol/h. For a product rate
kmol/h, the optimum value of
is ____ m
(rounded off to the nearest integer).GIVEN:
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Open questionCHNAT1 markNeeds review
The capital cost of a distillation column is Rs. 90 lakhs. The cost is to be fully depreciated (salvage value is zero) using the double-declining balance method over 10 years. At the end of two years of continuous operation, the book-value of the column, in lakhs of rupees, rounded off to 1 decimal place, is _____
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Open questionCHMCQ2 marksNeeds review
For purchasing a batch reactor, three alternatives P, Q and R have emerged, as summarized in the table. For a compound interest rate of 10% per annum, choose the correct option that arranges the alternatives, in order, from the least expensive to the most expensive.
| P | Q | R |
|---|---|---|---|
Installed Cost (lakh rupees) | 15 | 25 | 35 |
Equipment Life (years) | 3 | 5 | 7 |
Maintenance Cost (lakh rupees per year) | 4 | 3 | 2 |
Your answerChoose one option.
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Open questionCHNAT2 marksNeeds review
A design engineer needs to purchase a membrane module (M) for a plant. Details about the two available options, M1 and M2, are given in the table below. The overall plant has an expected life of 7 years. If the interest rate is 8% per annum, compounded annually, the difference in the net present value (NPV) of these two options, in lakhs of rupees, is _____ (rounded off to one decimal place).
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Open questionCHNAT2 marksNeeds review
The purchase cost of a new distillation column is Rs. 10 lakhs with an installation factor of 5.8. The cost of the capital is to be annualized over a period of 6 years at a fixed rate of interest of 5 % per annum, compounded annually. The annual cost (in lakhs of rupees) of the installed capital is ______ (rounded off to one decimal place).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 65
Open questionCHNAT2 marksNeeds review
Pumps
and
are being considered for purchase in a chemical plant. Cost details for these two pumps are given in the table below. The interest rate is 10 % per annum, compounded annually. For both the pumps to have the same capitalized cost, the salvage value (in Rs.) of pump B should be _____ (rounded off to the nearest integer).Log in to check the answer
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