GATE CH purpose:exam-prep PYQs & Answers — Page 64

Questions 631–640 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 64 of 65

The C-curve measured during a pulse tracer experiment is shown below. In the figure,

is the concentration of the tracer measured at the reactor exit in mol/liter at time

seconds.

Diagram for Chemical Engineering question 46

The mean residence time in the reactor, rounded to 1 decimal place, is _____ s.

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The following liquid phase second-order reaction is carried out in an isothermal CSTR at steady state

where

is the concentration of the reactant in the CSTR. The reactor volume is 2 m

, the inlet flowrate is 0.5 m

/hr and the inlet concentration of the reactant is 1000 mol/m

. The fractional conversion, rounded to 2 decimal places, is ______ .

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The reversible reaction of t-butyl alcohol (TBA) and ethanol (EtOH) to ethyl t-butyl ether (ETBE) is

The equilibrium constant for this reaction is

. Initially, 74 g of TBA is mixed with 100 g of aqueous solution containing 46 weight% ethanol. The molecular weights are: 74 g/mol for TBA, 46 g/mol for EtOH, 102 g/mol for ETBE, and 18 g/mol for water. The mass of ETBE at equilibrium, rounded to 1 decimal place, is _____ g.

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The following gas-phase reaction is carried out in a constant-volume isothermal batch reactor

The reactants A and B as well as the product S are non-condensable gases. At the operating temperature, the saturation pressure of the product R is 40 kPa. Initially, the batch reactor contains equimolar amounts of A and B (and no products) at a total pressure of 100 kPa. The initial concentrations of the reactants are

. The rate of reaction is given by

. The time at which R just starts condensing, rounded to 1 decimal place, is ________ s.

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The transfer function of a system is

For a unit step increase in the input, the fractional overshoot, rounded to 2 decimal places, is _____.

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The open loop transfer function of a process with a proportional controller (gain

) is

Based on the Bode criterion for closed-loop stability, the ultimate gain of the controller, rounded to 2 decimal places, is __________.

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The characteristic equation of a closed-loop system is

The value of

beyond which the system just becomes unstable, rounded to the nearest integer, is __________.

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A bond has a maturity value of 20,000 Rupees at the end of 4 years. The interest is compounded at the rate of 5% per year. The initial investment to be made, rounded to the nearest integer, is __________ Rupees.

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The total cost (

) of an equipment in terms of the operating variables

and

The optimal value of

, rounded to 1 decimal place, is _____________.

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Match the equipment in Group-1 with the process in Group-2

Group-1 P) Fluidized bed Q) Multistage adiabatic reactor with inter-stage cooling R) Fourdrinier machine S) Diaphragm cell

Group-2 I) Paper-making II) Sodium hydroxide manufacture III) SO₂ oxidation IV) Catalytic cracking

Choose the correct set of combinations.

Your answerChoose one option.

P-IV, Q-III, R-I, S-II

P-IV, Q-III, R-II, S-I

P-III, Q-IV, R-I, S-II

P-III, Q-IV, R-II, S-I

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GATE CH purpose:exam-prep PYQs

Question 46

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Question 55