Latest Chemical Engineering MCQs – Competitive Thermodynamics MCQs

Latest Chemical Engineering MCQs – Competitive Thermodynamics MCQs

This post is comprising of latest ” Thermodynamics MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest chemical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding chemical engineering then read these mcqs of Design of Steel Structures.

Latest Chemical Engineering MCQs

By practicing these MCQs of Thermodynamics MCQs – Latest Competitive Chemical Engineering MCQs , an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to Thermodynamics Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Thermodynamics Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.

Latest Thermodynamics Mcqs

The most occurred mcqs of Thermodynamics in past papers. Past papers of Thermodynamics Mcqs. Past papers of Thermodynamics Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Thermodynamics Mcqs. The Important series of Thermodynamics Mcqs are given below:

Which of the following is an undesirable characteristic of a refrigerant ?

A. Its vapor pressure at the condenser temperature should be very high
B. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
C. It should be non-explosive
D. None of these

Sound waves propagation in air exemplifies an ______________ process?

A. Adiabatic
B. Isometric
C. Isothermal
D. None of these

Work done may be calculated by the expression ∫ p dA for _____________ processes ?

A. Adiabatic
B. Non-flow reversible
C. Both A. and B
D. Neither A. nor B

1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be ?

A. 174 K
B. 35 K
C. 274 K
D. 154 K

In the reaction; N2 + O2 ⇌ 2NO, increasing the pressure will result in_________________?

A. Shifting the equilibrium towards left
B. Shifting the equilibrium towards right
C. No change in equilibrium condition
D. None of these

At a given temperature, the volume of a gas dissolved in a solvent _______________ with increase in pressure?

A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease; depends on the gas

____________ does not change during phase transformation processes like sublimation, melting & vaporisation?

A. Internal energy
B. Gibbs free energy
C. Entropy
D. All (A), B. & (C)

At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________?

A. Infinity
B. One
C. Zero
D. Negative

Lenz’s law results from the law of conservation of___________________?

A. Momentum
B. Mass
C. Energy
D. None of these

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?

A. Condenser
B. Expansion valve
C. Refrigerator
D. Compressor

One ton of refrigeration capacity is equivalent to the heat removal rate of____________________?

A. 200 BTU/hr
B. 50 kcal/hr
C. 200 BTU/minute
D. 200 BTU/day

Entropy, which is a measure of the disorder of a system, is__________________?

A. Independent of temperature
B. Independent of pressure
C. Zero at absolute zero temperature for a perfect crystalline substance
D. All A, B. & C

A refrigerator works on the principle of _____________ law of thermodynamics?

A. First
B. Zeroth
C. Second
D. Third

Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?

A. [∂(A/T)/∂T]V = – E/T2
B. [∂(G/T)/∂T] = – (H/T2)
C. Both A. and B.
D. Neither A. nor B.

Pick out the correct statement?

A. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero
B. The internal energy of an ideal gas depends only on its pressure
C. Melting of ice involves increase in enthalpy and a decrease in randomness
D. Maximum work is done under reversible conditions

A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by_________________?


The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H – P. This equation is called the ___________________?

A. Equation of state
B. Thermodynamic equation of state
C. Maxwell’s equation
D. Redlich-Kwong equation of state

Process Control And Instrumentation Mcqs

Cv is given by__________________?

A. (∂E/∂T)V
B. (∂E/∂P)V
C. (∂E/∂V)T
D. (∂V/∂T)P

There is a change in ______________ during the phase transition?

A. Volume
B. Temperature
C. Pressure
D. All a, b & c

In Joule-Thomson porous plug experiment, the__________________?

A. Temperature remains constant
B. Entire apparatus is exposed to surroundings
C. Enthalpy does not remain constant
D. None of these

A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system is______________?

A. 3
B. 5
C. 4
D. 6

A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_________________?

A. 349
B. 667
C. 651
D. 1000

Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?

A. ∞
B. 1
C. 0
D. None of these

One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is_________________?

A. 4988.4
B. 10373
C. 30554
D. 4364.9

Trouton’s ratio of ______________ liquids is calculated using Kistyakowsky equation?

A. Polar
B. Non-polar
C. Both of the above
D. Neither of the above

The shape of T-S diagram for Carnot Cycle is a__________________?

A. Rectangle
B. Trapezoid
C. Rhombus
D. Circle

Claude’s liquefaction process employs the cooling of gases by__________________?

A. Expansion in an engine
B. Throttling
C. Following a constant pressure cycle
D. None of these

“The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances”. This is the_________________?

A. Le-Chatelier’s principle
B. Statement of Van’t Hoff Equation
C. Lewis-Randall rule
D. None of these

A Carnot cycle consists of the following steps ?

A. Two isothermal and two isentropic
B. Two isochoric and two isobaric
C. Two isobaric and two isothermal
D. Two isothermals and two isochoric

A solid is transformed into vapour without going to the liquid phase at_________________?

A. Triple point
B. Below triple point
C. Boiling point
D. Always

When a gas is subjected to adiabatic expansion, it gets cooled due to__________________?

A. Decrease in temperature
B. Decrease in velocity
C. Decrease in kinetic energy
D. Energy spent in doing work

Work done in case of free expansion is____________________?

A. Negative
B. Zero
C. Indeterminate
D. None of these

Ideal gas law is applicable at____________________?

A. High T, high P
B. Low T, low P
C. Low T, high P
D. High T, low P

For an isothermal process, the internal energy of a gas____________________?

A. Decreases
B. Increases
C. Remains unchanged
D. Data insufficient, can’t be predicted

The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is__________________?

A. A . x22
B. Ax2
C. Ax1
D. Ax12

The standard Gibbs free energy change of a reaction depends on the equilibrium______________________?

A. Composition
B. Temperature
C. Pressure
D. All A, B. and C

The most important application of distribution law is in_____________________?

A. Drying
B. Liquid extraction
C. Evaporation
D. Distillation

Enthalpy changes over a constant pressure path are always zero for ______________ gas?

A. A real
B. A perfect
C. An easily liquefiable
D. Any

Fugacity is most helpful in____________________?

A. Representing actual behaviour of real gases
B. The study of chemical equilibria involving gases at atmospheric pressure
C. Representing actual behaviour of ideal gases
D. None of these

During adiabatic expansion of gas___________________?

A. Pressure is increased
B. Pressure remains constant
C. Temperature remains constant
D. None of these

What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?

A. 2
B. 1
C. 0
D. 3

In an ideal solution, the activity of a component equals its __________________?

A. Mole fraction
B. Partial pressure
C. Fugacity at the same temperature and pressure
D. None of these

Which of the following non-flow reversible compression processes require maximum work ?

A. Adiabatic process
B. Isobaric process
C. Isothermal process
D. All require same work

Fluid Mechanics Mcqs

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?

A. Negative
B. Positive
C. Zero
D. Infinity

Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?

A. d ln p/dt = Hvap/RT2
B. dp/dt = RT2/Hvap
C. d ln p/dt = RT2/Hvap
D. dp/dt = Hvap/RT2

Cp – Cv = R is valid for ______________ gases?

A. Ideal
B. Very low temperature
C. Very high pressure
D. All of the above

If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in____________________?

A. Enthalpy
B. Volume
C. Both A. & B
D. Neither A. nor B

Activity co-efficient is a measure of the____________________?

A. Departure from ideal solution behaviour
B. Vapour pressure of liquid
C. Departure of gas phase from ideal gas law
D. None of these

Fugacity and pressure are numerically equal, when the gas is____________________?

A. At high pressure
B. In standard state
C. At low temperature
D. In ideal state

Third law of thermodynamics is concerned with the__________________?

A. Value of absolute entropy
B. Direction of energy transfer
C. Energy transfer
D. None of these

Clapeyron Equation deals with the____________________?

A. Rate of change of vapour pressure with temperature
B. Calculation of ΔF for spontaneous phase change
C. Effect of an inert gas on vapour pressure
D. Temperature dependence of heat of phase transition

For an ideal gas, the enthalpy__________________?

A. Decreases with rise in pressure
B. Increases with rise in pressure
C. Is independent of pressure
D. Is a path function

Fugacity and pressure are numerically not equal for the gases__________________?

A. At standard state
B. At low temperature and high pressure
C. Both A. and B
D. In ideal state

Work done in an adiabatic process between two states depends on the__________________?

A. Initial state only
B. Rate of heat transmission
C. End states only
D. None of these

Which is an example of closed system ?

A. Boiler
B. Liquid cooling system of an automobile
C. Air compressor
D. None of these

For a reversible process involving only pressure-volume work____________________?

A. (dA)T, v < 0
C. (dF)T, p = 0
D. (dF)T, p 0

Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?

A. Partial pressure
B. Fugacity
C. Activity co-efficient
D. All (A), (B), and (C)

A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?

A. Temperature and pressure only
B. Temperature only
C. Temperature, pressure and liquid composition xi only
D. Temperature, pressure, liquid composition xi and vapour composition yi

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ?

A. 3
B. 2
C. 1
D. 0

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?

A. 300 × (32/7)
B. 300 × (333/7)
C. 300 × (33/5)
D. 300 × (35/7)

What is the ratio of adiabatic compressibility to isothermal compressibility ?

A. > 1
B. < 1
C. 1
D. >> 1

“Dry ice” is________________?

A. Solid helium
B. Moisture free ice
C. Solid carbon dioxide
D. None of these

Henry’s law is closely obeyed by a gas, when its _____________ is extremely high?

A. Solubility
B. Pressure
C. Temperature
D. None of these

In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible ______________ process?

A. Isobaric
B. Isentropic
C. Isothermal
D. Isometric

Which of the following is an extensive property of a system ?

A. Heat capacity
B. Pressure
C. Molal heat capacity
D. Concentration

In a homogeneous solution, the fugacity of a component depends upon the __________________?

A. Composition
B. Pressure
C. Temperature
D. All (A), B. and (C)

Compressibility factor of a gas is___________________?

A. Not a function of its pressure
B. Not a function of its temperature
C. Not a function of its nature
D. Unity, if it follows PV = nRT

Gibbs free energy of mixing at constant pressure and temperature is always__________________?

A. ∞
B. 0
C. + ve
D. – ve

For an incompressible fluid, the _______________ is a function of both pressure as well as temperature?

A. Entropy
B. Enthalpy
C. Internal energy
D. All (A), B. & (C)

Plant-Economics Mcqs

When dilute aqueous solutions of two salts are mixed, the process is associated with ___________________?

A. No change in temperature
B. Increase in temperature
C. Decrease in temperature
D. Change in temperature which is a function of composition

For a cyclic process, a fixed ratio between heat and work___________________?

A. Always exists
B. Never exists
C. May exist
D. Is difficult to predict

Equilibrium constant of a reaction varies with the____________________?

A. Pressure
B. Initial concentration of the reactant
C. Temperature
D. None of these

Which of the following is not a reversible process ?

A. Atmospheric pressure vaporisation of water at 100°C
B. Expansion of an ideal gas against constant pressure
C. Solution of NaCl in water at 50°C
D. None of these

With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure___________________?

A. Increases
B. Remain same
C. Decreases
D. Decreases linearly

The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?

A. Reversible isothermal volume change
B. Cooling of a substance
C. Heating of a substance
D. Simultaneous heating and expansion of an ideal gas

Critical temperature is defined as the temperature above which a gas will____________________?

A. Immediately liquify
B. Not liquify (barring exceptions)
C. Never liquify however high the pressure may be
D. None of these

For equilibrium process (i.e. reversible) in an isolated system __________________?

A. ds = 0
B. ds = Constant
D. ds 0

Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by_________________?

A. Low temperature and high pressure
B. High temperature and high pressure
C. Low temperature and low pressure
D. High temperature and low pressure

If two gases have same reduced temperature and reduced pressure, then they will have the same____________________?

A. Mass
B. Volume
C. Critical temperature
D. None of these

“The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture”. This is__________________?

A. Henry’s law
B. Called Lewis-Randall rule
C. The statement as per Gibbs-Helmholtz
D. None of these

The internal energy of an ideal gas is a function of its _____________ only?

A. Volume
B. Molecular size
C. Pressure
D. Temperature

Third law of thermodynamics is helpful in___________________?

A. Prediction of the extent of a chemical reaction
B. Evaluating entropy changes of chemical reaction
C. Calculating absolute entropies of substances at different temperature
D. Both B. and C.

Entropy change for an irreversible process taking system and surrounding together is___________________?

A. < 0
B. > 0
C. 0
D. None of these

____________ explains the equilibrium constant for any chemical reaction?

A. Hess’s law
B. Law of mass action
C. Henry’s law
D. None of these

“When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change.” This is called the_______________?

A. Le-Chatelier principle
B. Law of corresponding state
C. Kopp’s rule
D. Arrhenius hypothesis

The adiabatic throttling process of a perfect gas is one of constant enthalpy_________________?

A. Which is exemplified by a non-steady flow expansion
B. In which there is a temperature drop
C. Which can be performed in a pipe with a constriction
D. In which there is an increase in temperature

The compressibility factor for an ideal gas is 1. Its value for any other real gas is_______________?

A. 1
B. 2
D. Either B. or C, depends on the nature of the gas

Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm) ?

A. Temperature must be kept above – 57°C
B. Pressure must be kept below 5.2 atm
C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
D. Pressure and temperature must be kept below 5.2 atm. and – 57°C respectively

The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition?

A. Enthalpy
B. Internal energy
C. Gibbs free energy
D. Helmholtz free energy

Gibbs free energy (F) is defined as__________________?

A. F = H + TS
B. F = H – TS
C. F = E – TS
D. F = E + TS

A refrigeration cycle is the same as a _____________ cycle?

A. Heat engine
B. Turbine
C. Reversed heat engine
D. None of these

The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________?

A. T, P and Z
B. T and P
C. T
D. T and Z

A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount”. This is_________________?

A. The distribution law
B. A corollary of Henry’s law
C. Followed from Margules equation
D. None of these

Pick out the wrong statement_________________?

A. CP and CV are state function
B. Heat and work are both state function
C. The work done by expansion of a gas in vacuum is zero
D. Phase rule variables are intensive properties

Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?

A. (T2 – T1)/T2
B. (T1 – T2)/T2
C. (T2 – T1)/T1
D. (T1 – T2)/T1

Chemical potential of ith component of a system is given by________________?

A. μi = (∂F/∂ni)T, P, ni
B. μi = (∂F/∂ni)T, P
C. μi = (∂A/∂ni)T, P, ni
D. μi = (∂A/∂ni)T, P

Kopp’s rule is used to calculate the heat capacity of___________________?

A. Solids
B. Gases
C. Liquids
D. All (A), B. & (C)

An isolated system can exchange ______________ with its surroundings?

A. Energy
B. Matter
C. Neither matter nor energy
D. Both matter and energy

Heat of formation of an element in its standard state is___________________?

A. 0
B. A function of pressure
D. 1

Pick out the wrong statement. A. The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction________________?

A. With increase in temperature, the equilibrium constant increases for an exothermic reaction
B. None of the above
C. The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction
D. The equilibrium constant of a reaction depends upon temperature only

Latest Chemical Engineering MCQs – Competitive Thermodynamics MCQs

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