GATE CH Process Calculations and Thermodynamics PYQs & Answers

Questions 1–10 of 79. Imported answers require independent review unless marked reviewed.

Consider a closed system of one mole of an ideal gas undergoing a polytropic process. The process follows

, where P is the pressure, V is the volume and n is a constant. If the process is isobaric, which one of the following is the value of n?

Your answerChoose one option.

the ratio of specific heat capacity at constant pressure to specific heat capacity at constant volume

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According to the phase rule, which one of the following is the number of degrees of freedom for pure water at its triple point?

Your answerChoose one option.

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For an irreversible reaction containing inerts in the feed, single-pass conversion in a reactor is 70%. Which one of the following statements is CORRECT?

Your answerChoose one option.

Recycle eliminates the need for a purge stream.

Recycle reduces the concentration of inerts in the system.

Recycle increases the overall conversion.

Recycle decreases the overall conversion.

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Which of the following statements regarding the heat of reaction is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

For endothermic reaction, it is positive.

For exothermic reaction, it is negative.

For exothermic reaction, it is positive.

It is the enthalpy change for a process in which stoichiometric quantities of reactants, at a temperature and pressure, react completely in a single reaction to form products at the same temperature and pressure.

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Consider a homogeneous gas phase reaction, A + 2B → 2C + 3D, occuring at constant temperature and pressure in a varying volume batch reactor. The vessel is initially charged with 50 moles of A and 150 moles of B. The gases behave ideally. For complete conversion of A, the ratio of the final volume to the initial volume is _____ (rounded off to one decimal place).

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K value is defined as the ratio of mole fraction of a component in the vapor phase to that in the liquid phase. The K values of propane and iso-butane at 293 K are given in the table.

Pressure (kPa)	Propane	iso-Butane
1100	1.8	0.85
1200	1.6	0.75
1300	1.4	0.65
1400	1.25	0.5
1500	1.1	0.45

Which one of the following is closest to the bubble point pressure (in kPa) of an equimolar mixture of propane and iso-butane at 293 K?

Your answerChoose one option.

1110

1190

1310

1390

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A feed containing 10 mol % propylene, 15 mol % ammonia and rest air is charged into a reactor to produce acrylonitrile (C₃H₃N) according to the following reaction.

Assume, air contains 80 mol % N₂ and 20 mol % O₂.

If the conversion of the limiting reactant is 30%, the composition of C₃H₃N (in mol %) in the product stream is __________ (rounded off to two decimal places).

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A gas mixture of 50 wt. % argon and 50 wt. % helium flowing through a horizontal tube of uniform diameter at a rate of 1 kg s⁻¹ is heated from 300 K to 400 K at 1 bar. Neglect shaft work, and changes in kinetic as well as potential energies between the inlet and the outlet. Assume the mixture exhibits ideal gas behavior. The specific enthalpies of the components are given in the following table.

Component	Specific enthalpy (kJ kg⁻¹) at 300 K	Specific enthalpy (kJ kg⁻¹) at 400 K
Argon	348	400
Helium	1574	2092

At steady state, the heat input required (in kW) is __________ (rounded off to the nearest integer).

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Cyclohexane (C₆H₁₂) is produced from benzene (C₆H₆) and hydrogen (H₂) according to the following reaction.

Consider the process flow diagram shown in the figure.

Diagram for Chemical Engineering question 64

In this process, the overall and single-pass conversions are 90% and 25%, respectively. The recycle stream contains 25 mol % C₆H₆ and 75 mol % H₂. If the fresh feed contains 25% excess H₂, at steady state, the ratio of the molar flow rate of recycle stream to that of the fresh feed is _________ (rounded off to one decimal place).

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The number of independent intensive variables that need to be specified to determine the thermodynamic state of a ternary mixture at vapor-liquid-liquid equilibrium is

Your answerChoose one option.

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GATE CH Process Calculations and Thermodynamics PYQs

How to practice Process Calculations and Thermodynamics

Question 15

Question 16

Question 19

Question 27

Question 31

Question 36

Question 57

Question 58

Question 64

Question 15