Chemical Engineering MCQs – Latest 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:
The third law of thermodynamics states that the__________________?
A. Heat capacity of a crystalline solid is zero at absolute zero temperature
B. Gases having same reduced properties behaves similarly
C. Heat transfer from low temperature to high temperature source is not possible without external work
D. None of these
1st law of thermodynamics is nothing but the law of conservation of___________________?
A. Mass
B. Momentum
C. Energy
D. None of these
Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour?
A. Superheated
B. Non-condensable
C. Desuperheated
D. None of these
High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?
A. Δ H ≠ 0 and ΔS ≠ 0
B. Δ H ≠ 0 and ΔS = 0
C. Δ H = 0 and ΔS = 0
D. Δ H = 0 and ΔS ≠ 0
Compressibility factor for almost all the gases are approximately same at the same__________________?
A. Critical pressure and critical temperature
B. Reduced pressure and reduced temperature
C. Pressure and temperature
D. None of these
Which of the following will increase the volume of a real gas by four times ?
A. Reducing temperature to one fourth at constant pressure
B. Reducing pressure to one fourth at constant temperature
C. Doubling the absolute temperature as well as pressure of the gas
D. Reducing the temperature to half and doubling the pressure
Gibbs phase rule finds application, when heat transfer occurs by___________________?
A. Convection
B. Conduction
C. Radiation
D. Condensation
In jet refrigerators, the refrigerating fluid is practically always_________________?
A. Water
B. Freon
C. Ammonia
D. Brine
(∂T/∂P)H is the mathematical expression for__________________?
A. Specific heat at constant volume (Cv)
B. Specific heat at constant pressure (Cp)
C. Joule-Thompson co-efficient
D. None of these
Throttling process is a/an _____________ process?
A. Reversible and constant entropy
B. Irreversible and constant enthalpy
C. Reversible and isothermal
D. Reversible and constant enthalpy
Cv for an ideal gas__________________?
A. Is independent of pressure only
B. Does not depend upon temperature
C. Is independent of volume only
D. Is independent of both pressure and volume
The internal energy of an incompressible fluid depends upon its_________________?
A. Pressure
B. Temperature
C. Both of the above
D. Neither of the above
In a working refrigerator, the value of COP is always__________________?
A. < 0
B. 0
C. < 1
D. > 1
Ideal refrigeration cycle is____________________?
A. Dependent on the refrigerant’s properties
B. Same as reverse Carnot cycle
C. Same as Carnot cycle
D. The least efficient of all refrigeration processes
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?
A. < 0
B. = 0
C. > 0
D. None of these
An irreversible process____________________?
A. Is the analog of linear frictionless motion in machines
B. Yields the maximum amount of work
C. Is an idealised visualisation of behaviour of a system
D. Yields an amount of work less than that of a reversible process
Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the ____________ equation?
A. Maxwell’s
B. Gibbs-Duhem
C. Clapeyron
D. None of these
The unit of fugacity is the same as that of the_________________?
A. Pressure
B. Volume
C. Temperature
D. Molar concentration
Generation of heat by friction is an example of a/an ________________ change?
A. Adiabatic
B. Irreversible
C. Isothermal
D. Reversible
The variation of heat of reaction with temperature at constant pressure is given by the ____________ law?
A. Antoine’s
B. Kelvin’s
C. Kirchoff’s
D. None of these
Pick out the Clausius-Clapeyron equation from the following?
A. ΔF = ΔH + T [∂(ΔF)/∂T]P
B. ln P = – (ΔH/RT) + constant
C. dP/dT = ΔH/TΔV
D. None of these
An ideal liquid refrigerant should______________________?
A. Not have unduly high vapour pressure at the condenser temperature
B. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils
C. Both A. and B
D. Have low specific heat
Cp of a gas at its critical temperature and pressure_______________?
A. Equals 1 kcal/kmol °K
B. Becomes infinity
C. Becomes zero
D. Equals 0.24 kcal/kmol °K
Refractory Technology Mcqs
Which law of the thermodynamics provides basis for measuring the thermodynamic property ?
A. Third law
B. Zeroth law
C. First law
D. Second law
Second law of thermodynamics is concerned with the_________________?
A. Irreversible processes only
B. Direction of energy transfer
C. Amount of energy transferred
D. Non-cyclic processes only
In case of the decomposition of hydroiodic acid (2HI ⇌ H2 + I2), addition of H2 (at equilibrium condition) will__________________?
A. Decrease the partial pressure of HI
B. Increase the partial pressure of I2
C. Diminish the degree of dissociation of HI
D. None of these
Internal energy change of a system over one complete cycle in a cyclic process is__________________?
A. Zero
B. -ve
C. +ve
D. Dependent on the path
Entropy of an ideal gas depends upon its__________________?
A. Temperature
B. Pressure
C. Both A. & B
D. Neither A. nor B
Critical compressibility factor for all substances___________________?
A. Are more or less constant (vary from 0.2 to 0.3)
B. Vary as square of the absolute pressure
C. Vary as square of the absolute temperature
D. None of these
The expression, nRT ln(P1/P2), is for the _____________of an ideal gas?
A. Work done under adiabatic condition
B. Compressibility
C. Work done under isothermal condition
D. Co-efficient of thermal expansion
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2.Degree of dissociation of PCl5 will_________________?
A. Decrease on increasing the pressure of the system
B. Increase on addition of an inert gas at constant pressure
C. Decrease on addition of Cl2
D. None of these
As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches________________?
A. Zero
B. Infinity
C. Unity
D. None of these
Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?
A. Hot reservoir approaches infinity
B. Cold reservoir approaches zero
C. Either A. or B
D. Neither A. nor B
_____________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low?
A. Throttling
B. Bucket
C. Separating
D. A combination of separating & throttling
The necessary condition for phase equilibrium in a multiphase system of N components is that the____________________?
A. Chemical potentials of a given component should be equal in all phases
B. Sum of the chemical potentials of any given component in all the phases should be the same
C. Chemical potentials of all components should be same in a particular phase
D. None of these
The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by_________________?
A. (∂H/∂ni)S, P, nj
B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj
C. (∂E/∂ni)S, v, nj
D. All (A), B. and (C)
In case of a close thermodynamic system, there is ______________ across the boundaries?
A. Mass and energy transfer
B. No mass transfer but heat transfer
C. No heat and mass transfer
D. None of these
Entropy of a substance remains constant during a/an ____________ change?
A. Irreversible isothermal
B. Reversible isothermal
C. Reversible adiabatic
D. None of these
With increase in compression ratio, the efficiency of the otto engine________________?
A. Increases
B. Decreases
C. Increases linearly
D. Remain constant
When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is__________________?
A. More in liquid phase
B. More in vapour phase
C. Same in both the phases
D. Replaced by chemical potential which is more in vapour phase
A refrigerator may be termed as a____________________?
A. Heat pump
B. Carnot engine
C. Heat engine
D. None of these
Adiabatic compression of a saturated water vapour makes it ____________________ ?
A. Supersaturated
B. Superheated
C. Both of the above
D. Neither of the above
In case of an _______________ process, the temperature of the system increases?
A. Isothermal expansion
B. Isothermal compression
C. Adiabatic expansion
D. Adiabatic compression
Free energy change of mixing two liquid substances is a function of the__________________?
A. Temperature only
B. Quantities of the constituents only
C. Concentration of the constituents only
D. All A, B. and C
Gibbs-Helmholtz equation is__________________?
A. ΔF = ΔH + T [∂(ΔF)/∂T]P
B. d(E – TS) T, V < 0
C. ΔF = ΔH – TΔT
D. dP/dT = ΔHvap/T.ΔVvap
The equation, PV = nRT, is best obeyed by gases at____________________?
A. Low pressure & high temperature
B. Low pressure & low temperature
C. High pressure & low temperature
D. None of these
Heat of reaction at constant volume is identified with _____________ change?
A. Enthalpy
B. Internal energy
C. Either of the above
D. Neither of the above
The equation DU = Tds – PdV is applicable to infinitesimal changes occuring in_________________?
A. A closed system of constant composition
B. An open system of constant composition
C. An open system with changes in composition
D. A closed system with changes in composition
Which of the following is not an intensive property ?
A. Viscosity
B. Internal energy
C. Molar heat capacity
D. None of these
Process Control And Instrumentation Mcqs
Van Laar equation deals with the activity co-efficients in___________________?
A. Binary solutions
B. Azeotropic mixture only
C. Ternary solutions
D. None of these
The extensive properties are____________________?
A. Free energy, entropy and enthalpy
B. Volume, mass and number of moles
C. Both A. and B
D. None of these
In an ideal gas mixture, fugacity of a species is equal to its___________________?
A. Chemical potential
B. Partial pressure
C. Vapor pressure
D. None of these
A large iceberg melts at the base, but not at the top, because of the reason that_________________?
A. The iceberg remains in a warmer condition at the base
B. Due to the high pressure at the base, its melting point reduces
C. Ice at the base contains impurities which lowers its melting point
D. All A, B. and C
At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?
A. 142
B. 92
C. 72
D. 192
The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is__________________?
A. 0.5 RT
B. -RT ln 0.5
C. -2 RT ln 0.5
D. 2 RT
______________ Equation predicts the activity co-efficient from experimental data ?
A. Lewis-Randall
B. Van Laar
C. Margules
D. Both B. & C.
Charles’ law for gases states that__________________?
A. V/T = Constant
B. V ∝ 1/P
C. V ∝ 1/T
D. PV/T = Constant
At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ?
A. μ° + RT ln f
B. μ° + T ln f
C. μ°+ R ln f
D. μ° + R/T ln f
Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?
A. Use of only one graph for all gases
B. Easier plotting
C. Covering of wide range
D. More accurate plotting
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________?
A. CO2
B. H2
C. O2
D. N2
The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by____________________?
A. (ΔH/R) (1/T2 – 1/T1)
B. (ΔH/R) (1/T1 – 1/T2)
C. (R/ΔH) (1/T1 – 1/T2)
D. (1/R) (1/T1 – 1/T2)
In the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?
A. Increase
B. Not alter
C. Decrease
D. None of these
Pick out the correct equation relating ‘F’ and ‘A’___________________?
A. F = A + PV
B. F = A – TS
C. F = E + A
D. F = A + TS
A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be _____________ litres?
A. 448
B. 22.4
C. 224
D. Data insufficient; can’t be computed
For an ideal gas, the activity co-efficient is_________________?
A. Inversely proportional to pressure
B. Directly proportional to pressure
C. Unity at all pressures
D. None of these
In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible _____________ process?
A. Isentropic
B. Isometric
C. Adiabatic
D. Isothermal
“If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them”. This is ______________ law?
A. Hess’s
B. Lavoisier and Laplace
C. Kirchoff’s
D. None of these
A gas can be liquefied by pressure alone only, when its temperature is _____________ its critical temperature?
A. More than
B. Less than
C. Equal to or higher than
D. Less than or equal to
Fluid Mechanics Mcqs
Heat is added at constant temperature in an ideal ______________ cycle?
A. Stirling
B. Rankine
C. Brayton
D. None of these
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________?
A. Vaporisation
B. Fusion
C. Transition
D. None of these
Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the_______________?
A. High pressure and low temperature
B. Low pressure and low temperature
C. Low pressure and high temperature
D. High pressure and high temperature
Which of the following has the least thermal efficiency ?
A. Steam engine
B. Diesel engine
C. Carnot engine
D. Otto engine
The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point?
A. Boiling
B. Triple
C. Freezing
D. Boyle
Specific volume of an ideal gas is____________________?
A. Proportional to pressure
B. The reciprocal of its density
C. Equal to its density
D. None of these
Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture ______________ calorimeter is not used for measuring the dryness fraction of steam?
A. Bomb
B. Bucket
C. Separating
D. Throttling
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same?
A. Work
B. Kinematic viscosity
C. Temperature
D. None of these
The specific heat of saturated water vapour at 100°C is__________________?
A. 0
B. -ve
C. ∞
D. +ve
An isentropic process is carried out at constant____________________?
A. Volume
B. Temperature
C. Pressure
D. All (A), B. and (C)
Entropy is a measure of the _____________ of a system?
A. Disorder
B. Temperature changes only
C. Orderly behaviour
D. None of these
If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as__________________?
A. Solubility is independent of temperature
B. Solubility increases as temperature decreases
C. Solubility increases as temperature increases
D. Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution
Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?
A. > 94 kcal
B. +94 kcal
C. -94 kcal
D. < -94 kcal
Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________?
A. 0
B. ∞
C. Maximum
D. Minimum
The ammonia synthesis reaction represented by N2 + 3H2 ⇌ 2NH3; ΔH = – 22.4 kcal, is__________________?
A. Isothermal
B. Exothermic
C. Endothermic
D. Adiabatic
The quantitative effect of temperature on chemical equilibrium is given by the____________________?
A. Van’t-Hoff equation
B. Arrhenius equation
C. Le-Chatelier’s principle
D. None of these
Which is a state function ?
A. Pressure
B. Work
C. Specific volume
D. Temperature
Gibbs free energy of a pure fluid approaches _____________ as the pressure tends to zero at constant temperature?
A. Zero
B. Minus infinity
C. Infinity
D. None of these
Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be_________________?
A. 1
B. 0
C. 2
D. 3
Joule-Thomson experiment is__________________?
A. Isobaric
B. Isenthalpic
C. Adiabatic
D. Both B. & C.
The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?
A. 160,000 kW
B. 100,000 kW
C. 200,000 kW
D. 320,000 kW
The standard state of a gas (at a given temperature) is the state in which fugacity is equal to__________________?
A. Activity
B. Unity
C. Both A. & B
D. Neither A. nor B
As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is_________________?
A. Increasing
B. Decreasing
C. Not changed
D. Data sufficient, can’t be predicted
Fugacity co-efficient of a substance is the ratio of its fugacity to__________________?
A. Activity
B. Mole fraction
C. Pressure
D. Activity co-efficient
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?
A. Vapor compression cycle using expansion valve
B. Vapor compression cycle using expansion engine
C. Air refrigeration cycle
D. Carnot refrigeration cycle
For a multi-component system, the term chemical potential is equivalent to the ___________________?
A. Molar free energy
B. Molal concentration difference
C. Partial molar free energy
D. Molar free energy change
Which of the following behaves most closely like an ideal gas ?
A. He
B. O2
C. N2
D. H2
The total change in the enthalpy of a system is independent of the _______________________?
A. Number of intermediate chemical reactions involved
B. State of combination and aggregation in the beginning and at the end of the reaction
C. Pressure and temperature
D. None of these
With increase in temperature, the atomic heat capacities of all solid elements_________________?
A. Increases
B. Remains unchanged
C. Decreases
D. Decreases linearly
Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance) ?
A. Air cycle
B. Ordinary vapour compression cycle
C. Carnot cycle
D. Vapour compression with a reversible expansion engine
For an irreversible process involving only pressure-volume work____________________?
A. (dF)T, p <0
B. (dF)T, p > 0
C. (dF)T, p = 0
D. (dA)T, v >0
Degrees of freedom at triple point will be______________?
A. 0
B. 2
C. 1
D. 3