GATE CH format:nat PYQs & Answers — Page 25

Questions 241–250 of 252. Imported answers require independent review unless marked reviewed.

Topic practice 252 questionsPage 25 of 26

The vapor phase composition and relative volatilities (with respect to n-propane) on an ideal tray of a distillation column are

Component	Methane	Ethane	n-Propane
Mole fraction in vapor	0.12	0.28	0.60
Relative volatility	10	4	1

The mole fraction of n-propane in the liquid phase, rounded to 2 decimal places, is ____________.

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In a countercurrent stripping operation using pure steam, the mole ratio of a solute in the liquid stream is reduced from 0.25 to 0.05. The liquid feed flowrate, on a solute-free basis, is 3 mol/s. The equilibrium line for the system is given in the figure below.

Diagram for Chemical Engineering question 44

The MINIMUM flowrate of pure steam for this process, rounded to 1 decimal place, is ______ mol/s.

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In a batch adsorption process, 5 g of fresh adsorbent is used to treat 1 liter of an aqueous phenol solution. The initial phenol concentration is 100 mg/liter. The equilibrium relation is given by

where

is the amount of phenol adsorbed in mg of phenol per gram of adsorbent, and

is the concentration of phenol in mg/liter in the aqueous solution. When equilibrium is attained between the adsorbent and the solution, the concentration of phenol in the solution, rounded to 1 decimal place, is __________ mg/liter.

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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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GATE CH format:nat PYQs

Question 42

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