GATE CH topic:process-calculations-thermodynamics PYQs & Answers — Page 2

Questions 11–20 of 79. Imported answers require independent review unless marked reviewed.

The boundary of a system does not allow exchange of either mass or energy (in the form of heat and/or work) with the surroundings. The system is termed

Your answerChoose one option.

Isolated

Open

Adiabatic

Closed

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The following data is given for a ternary

gas mixture at 12 MPa and 308 K:

Component →
	0.55	0.20	0.25
	0.75	0.80	0.95

: mole fraction of component

in the gas mixture

: fugacity coefficient of component

in the gas mixture at 12 MPa and 308 K

The fugacity of the gas mixture is ____ MPa (rounded off to 3 decimal places).

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Ideal nonreacting gases

and

are contained inside a perfectly insulated chamber, separated by a thin partition, as shown in the figure. The partition is removed, and the two gases mix till final equilibrium is reached. The change in total entropy for the process is ____ J/K (rounded off to 1 decimal place).

Given: Universal gas constant

J/(mol K)

atm

Diagram for Chemical Engineering question 33

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An ideal monoatomic gas is contained inside a cylinder-piston assembly connected to a Hooke spring as shown in the figure. The piston is frictionless and massless. The spring constant is 10 kN/m. At the initial equilibrium state (shown in the figure), the spring is unstretched. The gas is expanded reversibly by adding 362.5 J of heat. At the final equilibrium state, the piston presses against the stoppers. Neglecting the heat loss to the surroundings, the final equilibrium temperature of the gas is ____ K (rounded off to the nearest integer).

Diagram for Chemical Engineering question 48

GIVEN: For a monoatomic ideal gas,

, where

J/(mol K)

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Components

and

form an azeotrope. The saturation vapour pressures of

and

at the boiling point are 87 kPa and 72.7 kPa, respectively. The azeotrope composition is ____ mol%

(rounded off to the nearest integer).

GIVEN:

where

and

are the liquid phase mole fraction and activity coefficient of component

, respectively.

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Methanol is produced by the reversible, gas-phase hydrogenation of carbon monoxide as

and

are charged to a reactor and the reaction proceeds to equilibrium at 453 K and 2 atm. The reaction equilibrium constant, which depends only on the temperature, is 1.68 at the reaction conditions. The mole fraction of

in the product is 0.4. Assuming ideal gas behaviour, the mole fraction of methanol in the product is ____ (rounded off to 2 decimal places).

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A homogeneous azeotropic distillation process separates an azeotropic AB binary feed using a heavy entrainer, E, as shown in the figure. The loss of E in the two product streams is negligible so that E circulates around the process in a closed-circuit. For a distillation column with fully specified feed(s), given operating pressure, a single distillate stream and a single bottoms stream, the steady-state degrees of freedom equals 2. For the process in the figure with a fully specified AB feed stream and given column operating pressures, the steady-state degree of freedom equals

Diagram for Chemical Engineering question 14

Your answerChoose one option.

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Consider a vapour-liquid mixture of components A and B that obeys Raoult’s law. The vapour pressure of A is half that of B. The vapour phase concentrations of A and B are 3 mol m

and 6 mol m

, respectively. At equilibrium, the ratio of the liquid phase concentration of A to that of B is

Your answerChoose one option.

1.0

0.5

2.0

1.5

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Consider the reaction

in a continuous flow reactor under steady-state conditions. The component flow rates at the reactor inlet are

. If the fractional conversion of

is 0.60, the outlet flow rate of

, in

, rounded off to the nearest integer, is ________

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Consider a binary mixture of components

and

at temperature

and pressure

. Let

and

be the partial molar volumes of

and

, respectively. At a certain mole fraction of

The value of

, rounded off to 2 decimal places, is _______

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GATE CH topic:process-calculations-thermodynamics PYQs

Question 16

Question 32

Question 33

Question 48

Question 57

Question 61

Question 14

Question 18

Question 31

Question 32