GATE CH topic:process-calculations-thermodynamics PYQs & Answers — Page 7

Questions 61–70 of 79. Imported answers require independent review unless marked reviewed.

For a given binary system at constant temperature and pressure, the molar volume (in m³/mol) is given by:

, where

and

are the mole fractions of components A and B, respectively. The volume change of mixing

(in m³/mol) at

is ________ (rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider a vessel containing steam at 180 °C. The initial steam quality is 0.5 and the initial volume of the vessel is 1 m³. The vessel loses heat at a constant rate

under isobaric conditions so that the quality of steam reduces to 0.1 after 10 hours. The thermodynamic properties of water at 180 °C are (subscript

: vapor phase; subscript

: liquid phase): specific volume:

m³/kg,

m³/kg; specific internal energy:

kJ/kg,

kJ/kg; specific enthalpy:

kJ/kg,

kJ/kg. The rate of heat loss

(in kJ/hour) is __________ (rounded off to the nearest integer).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A fractionator recovers 95 mol % n-propane as the distillate from an equimolar mixture of n-propane and n-butane. The condensate is a saturated liquid at 55 °C. The Antoine equation is of the form,

, and the constants are provided below:

Component	A	B	C
n-propane	9.1058	1872.46	−25.16
n-butane	9.0580	2154.90	−34.42

Assuming Raoult’s law, the condenser pressure (in bar) is __________ (rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the reactor-separator-recycle process operating under steady state conditions as shown in the figure. The reactor is an ideal Continuous-Stirred Tank Reactor (CSTR), where the reaction A + B → C occurs. Assume that there is no impurity in the product and recycle streams. Other relevant information are provided in the figure.

Diagram for Chemical Engineering question 53

The mole fraction of B (

) in the reactor that minimizes the recycle rate is __________ (rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the following properties: (P) temperature (Q) specific gravity (R) chemical potential (S) volume The option which lists ALL the intensive properties is

Your answerChoose one option.

P and Q

P, Q and R

P, Q, R and S

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The reactant (M) is converted into product (N) in the presence of catalyst in a fixed bed reactor. All the flow rates (F, G, H, P and R) in mol/s, and mole fraction of reactant (M) in these streams (x_F, x_G, x_H, x_P and x_R) are shown in the diagram.

Diagram for Chemical Engineering question 17

The overall fractional conversion is

Your answerChoose one option.

(x_G G − x_H H)/(x_G G)

(x_G G − x_P P)/(x_G G)

(x_F F − x_H H)/(x_F F)

(x_F F − x_P P)/(x_F F)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The ammonia (NH₃) oxidation process occurs over a catalyst as

4 NH₃ + 5 O₂ → 6 H₂O + 4 NO

Air is supplied such that oxygen (O₂) is 20% in excess of that required for complete conversion of NH₃. The mole fraction of O₂ in inlet gas mixture (NH₃ + air) is ______ (rounded off to third decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

G denotes the Gibbs free energy of a binary mixture, nₜ denotes the total number of moles present in the system, μᵢ is the chemical potential of the iᵗʰ component (μᵢ ≠ 0 and μ₁ > μ₂) and xᵢ is the mole fraction of the iᵗʰ component. The correct variation of G/nₜ (in J/mol) at constant temperature and pressure is given by

Your answerChoose one option.

Diagram for Chemical Engineering question 29

Diagram for Chemical Engineering question 29 (figure 2)

Diagram for Chemical Engineering question 29 (figure 3)

Diagram for Chemical Engineering question 29 (figure 4)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

An azeotropic mixture of ethanol and water is to be separated in a distillation column using benzene as an entrainer. At the column operating conditions, two liquid phases are formed on a tray. The degree(s) of freedom of the system for the choice of intensive properties at equilibrium is(are) __________

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a closed piston-cylinder system, methane was observed to obey the following equation of state

where

m³/mol. The temperature and volume are 500 °C and 5 m³ respectively for 100 moles of methane. At this state of the system, the isobaric rate of change of temperature with volume (in °C/m³) is __________ (rounded off to second decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE CH topic:process-calculations-thermodynamics PYQs

Question 38

Question 39

Question 40

Question 53

Question 14

Question 17

Question 24

Question 29

Question 48

Question 50