New Thermodynamics MCQs – Most Latest Chemical Engineering MCQs

New Thermodynamics MCQs – Most Latest Chemical Engineering 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

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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:

Enthalpy of a gas depends upon its___________________?

A. Temperature
B. Volume
C. Mass
D. Pressure

The intensive properties are_____________?

A. Refractive index and surface tension
B. Molar volume, density, viscosity and boiling point
C. Both A. and B
D. None of these

Standard temperature and pressure (S.T.P.) is__________________?

A. 0°C and 750 mm Hg
B. 0°C and 1 kgf/cm2
C. 15°C and 750 mm Hg
D. 15°C and 1 kgf/cm2

The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is__________________?

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

Melting of wax is accompanied with ______________ in entropy?

A. Increase
B. No change
C. Decrease
D. None of these

Reduced pressure of a gas is the ratio of its__________________?

A. Pressure to critical pressure
B. Pressure to pseudocritical pressure
C. Critical pressure to pressure
D. Pseudocritical pressure to pressure

Which of the following exemplifies an adiabatic process ?

A. Condensation of alcohol vapor
B. Melting of ice
C. Sudden bursting of a cycle tube
D. Evaporation of water

For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ↔ C2H5OH(g), the equilibrium conversion does not depend on the________________?

A. Temperature
B. Steam to ethylene ratio
C. Pressure
D. None of these

Which of the following is affected by the temperature ?

A. Free energy
B. Activity co-efficient
C. Fugacity
D. All A, B. & C

Chemical engineering thermodynamics is concerned with the ____________ in/of chemical processes?

A. Calculation of rates
B. Reaction mechanism
C. Energy transformation from one form to another
D. None of these

In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be________________?

A. 5.2
B. 0.168
C. 6.2
D. Data insufficient, can’t be found out

Which one is true for a throttling process ?

A. The inversion temperature is same for all gases
B. The inversion temperature is different for different gases
C. A gas may have more than one inversion temperatures
D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________?

A. Unity
B. Infinity
C. Constant
D. Negative

Refrigerants commonly used for domestic refrigerators are_________________?

A. Ethyl chloride or methyl chloride
B. Propane
C. Freon-12
D. NH3 or CO2

Which of the following is not an extensive property ?

A. Entropy
B. Free energy
C. Refractive index
D. None of these

Air-refrigeration cycle________________?

A. Has very low efficiency
B. Is the most efficient of all refrigeration cycles
C. Requires relatively large quantities of air to achieve a significant amount of refrigeration
D. Both B. and C

The minimum number of phases that can exist in a system is________________?

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

For an isothermal reversible compression of an ideal gas_______________?

A. Only ΔH =0
B. Only ΔE = 0
C. ΔE = ΔH = 0
D. dQ = dE

Solid and liquid phases of a substance are in equilibrium at the____________________?

A. Critical temperature
B. Freezing point
C. Melting point
D. Both B. and C

Internal energy of an ideal gas___________________?

A. Is independent of temperature
B. Decreases with increase in temperature
C. Increases with increase in pressure
D. None of these

Refractory Technology Mcqs

Requisites of a reversible process is that the ____________________?

A. System and surroundings temperature be equal
B. Friction in the system should be absent
C. System and surroundings pressure be equal
D. None of these

The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann‟s constant, T = absolute temperature) ?

A. √(6KT/m)
B. √(3KT/m)
C. √(2KT/m)
D. 3KT/m

Normal temperature and pressure (N.T.P.) corresponds to ___________________?

A. 15°C and 760 mm Hg
B. 0°C and 760 mm Hg
C. 20°C and 760 mm Hg
D. 0°C and 1 kgf/cm2

Melting of ice exemplifies a/an______________________?

A. Exothermic reaction
B. Endothermic reaction
C. Adiabatic process
D. Process involving a chemical reaction

Absolute zero temperature signifies the ____________________?

A. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in
B. Minimum temperature attainable
C. Temperature of the heat reservoir to which a Carnot engine rejects no heat
D. None of these

A gas performs the maximum work, when it expands___________________?

A. Adiabatically
B. Non-uniformly
C. Isobarically
D. Isothermally

Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?

A. Two temperatures only
B. Mass of the working fluid
C. Pressure of working fluid
D. Mass and pressure both of the working fluid

For a thermodynamic system containing ‘x’ chemical species, the maximum number of phases that can co-exist at equilibrium is_________________?

A. x + 1
B. x
C. x + 2
D. x + 3

At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?

A. Plait
B. Triple
C. Eutectic
D. Critical

Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?

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

Which of the following is Virial equation of state ?

A. PV = nRT
B. (p + a/V2)(V – b) = nRT
C. PV = A + B/V + C/V2 + D/V3 + …
D. None of these

Joule-Thomson effect i.e., a throttling process is a constant _____________ process?

A. Temperature
B. Entropy
C. Internal energy
D. Enthalpy

For an exothermic reaction ____________________?

A. Only internal energy change (ΔE) is negative
B. Only enthalpy change (ΔH) is negative
C. Both ΔH and ΔE are negative
D. Enthalpy change is zero

For spontaneous changes in an isolated system (S = entropy) ___________________?

A. ds <0
B. ds = 0
C. ds > 0
D. ds = Constant

The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?

A. Zero
B. More than zero
C. Negative
D. Indeterminate

In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _____________ process?

A. Isothermal
B. Polytropic
C. Isobaric
D. Adiabatic

The second law of thermodynamics states that___________________?

A. It is not possible to transfer heat from a lower temperature to a higher temperature
B. The energy change of a system undergoing any reversible process is zero
C. The total energy of system and surrounding remains the same
D. None of the above

A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be _____________ c.c?

A. 273
B. 28.3
C. 2.73
D. 283

The energy of activation of exothermic reaction is_________________?

A. Negative
B. Zero
C. Very large compared to that for endothermic reaction
D. Not possible to predict

Which of the following is not a common refrigerant ?

A. Freon-12
B. Ethylene
C. Carbon dioxide
D. Ammonia

Sublimation temperature of dry ice (solid CO2) is ____________ °C?

A. 0
B. -273
C. -78
D. 5

A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________?

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

During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?

A. +ve
B. -ve
C. 0
D. ∞

The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the _____________ equation?

A. Margules
B. Van Laar
C. Gibbs-Duhem
D. Gibbs-Duhem-Margules

A domestic refrigerator has a/an ____________ cooled condenser?

A. Evaporative
B. Air
C. Water
D. Gas

The equilibrium constant for a chemical reaction at two different temperatures is given by__________________?

A. Kp2/Kp1 = – (ΔH/R) (1/T2 – 1/T1)
B. Kp2/Kp1 = ΔH (1/T2 – 1/T1)
C. Kp2/Kp1 = (ΔH/R) (1/T2 – 1/T1)
D. Kp2/Kp1 = – (1/R) (1/T2 – 1/T1)

During Joule-Thomson expansion of gases_________________?

A. Enthalpy remains constant
B. Temperature remains constant
C. Entropy remains constant
D. None of these

The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is________________?

A. ∞
B. 0
C. +ve
D. -ve

Joule-Thomson co-efficient is defined as__________________?

A. μ = (∂E/∂T)H
B. μ = (∂T/∂P)H
C. μ = (∂P/∂T)H
D. μ = (∂E/∂P)H

Thermodynamics Mcqs

Gibbs free energy per mole for a pure substance is equal to the__________________?

A. Molal boiling point
B. Chemical potential
C. Latent heat of vaporisation
D. Heat capacity

All gases except ____________ shows a cooling effect during throttling process at atmospheric temperature and pressure?

A. Nitrogen
B. Oxygen
C. Air
D. Hydrogen

Out of the following refrigeration cycles, which one has maximum COP ?

A. Ordinary vapor compression cycle
B. Carnot cycle
C. Air cycle
D. Vapor compression with a reversible expansion engine

In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of ‘n’ is_________________?

A. 0
B. y = 1.44
C. 1
D. 1.66

Which of the following is true for Virial equation of state ?

A. Virial co-efficients ‘B’ represents three body interactions
B. Virial co-efficients are universal constants
C. Virial co-efficients are function of temperature only
D. For some gases, Virial equations and ideal gas equations are the same

The gas law (PV = RT) is true for an ______________ change?

A. Adiabatic
B. Isothermal
C. Both A. & B
D. Neither A. nor B

The work done in isothermal compression compared to that in adiabatic compression will be__________________?

A. Same
B. More
C. Less
D. More or less depending upon the extent of work done

Water on heating from 1 to 4°C___________________?

A. Contracts
B. Has same volume
C. Expands
D. May contract or expand

In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible ____________ process?

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

The chemical potential of any constituent of an ideal solution depends on the ______________ of the solution?

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

For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the _______________ of each component must be same in all phases?

A. Fugacity
B. Chemical potential
C. Both A. and B
D. Neither A. nor B

For a spontaneous process, free energy__________________?

A. Increases
B. Is zero
C. Decreases whereas the entropy increases
D. And entropy both decrease

The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is__________________?

A. Less
B. Same
C. More
D. Dependent on climatic conditions

First law of thermodynamics deals with the ___________________?

A. Direction of energy transfer
B. Irreversible processes only
C. Reversible processes only
D. None of these

The first law of thermodynamics is a statement of conservation of_____________________?

A. Momentum
B. Heat
C. Energy
D. Work

If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________?

A. Process must be isobaric
B. Process must be adiabatic
C. Temperature must decrease
D. Both B. and C.

As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches____________________?

A. Infinity
B. Unity
C. Zero
D. An indeterminate value

A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the _____________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) ?

A. Arithmetic
B. Logarithmic
C. Geometric
D. Harmonic

During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?

A. +ve
B. -ve
C. 0
D. ∞

Mollier chart is a _____________ plot?

A. Pressure vs. volume
B. Pressure vs. enthalpy
C. Enthalpy vs. entropy
D. Temperature vs. entropy

For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system _____________ as its mole fraction increases?

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

Rotary lime kiln is an example of a/an _____________ system?

A. Isolated
B. Open
C. Closed
D. Non-thermodynamic

Isobaric process means a constant process ?

A. Volume
B. Pressure
C. Temperature
D. Entropy

Fugacity is a measure of the____________________?

A. Escaping tendencies of the same substance in different phases of a system
B. Behaviour of ideal gases
C. Relative volatility of a mixture of two miscible liquids
D. None of these

A system is said to be at equilibrium, if the entropy of the system has reached ____________ value?

A. Zero
B. Minimum
C. Maximum
D. None of these

Fluid Mechanics Mcqs

The kinetic energy of gas molecule is zero at_____________________?

A. 273°C
B. 0°C
C. 100°C
D. -273°C

In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible ______________ process?

A. Adiabatic
B. Isothermal
C. Isentropic
D. Polytropic

Linde gas liquefaction process employs cooling ____________________?

A. By throttling
B. At constant pressure
C. By expansion in an engine
D. None of these

For a given substance at a specified temperature, activity is ______________ to fugacity?

A. Directly proportional
B. Equal
C. Inversely proportional
D. None of these

To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 – 1/T2) from the exact Clapeyron equation, it is assumed that the____________________?

A. Vapour phase behaves as an ideal gas
B. Volume of the liquid phase is negligible compared to that of vapour phase
C. Heat of vaporisation is independent of temperature
D. All A , B. & C.

Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?

A. 0
B. +ve
C. ∞
D. -ve

Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________?

A. Fusion
B. Sublimation
C. Transition
D. Vaporisation

The heat capacities for the ideal gas state depend upon the_________________?

A. Pressure
B. Temperature
C. Both of the above
D. Neither of the above

Compound having large heat of formation is_____________________?

A. More stable
B. Not at all stable (like nascent O2)
C. Less stable
D. Either more or less stable; depends on the compound

The equation, Cp – Cv = R, is true for _______________ gas?

A. Any real
B. No
C. Only ideal
D. Both B. and C.

What happens in a reversible adiabatic compression ?

A. Heating occurs
B. Pressure is constant
C. Cooling occurs
D. Temperature is constant

Maximum work that could be secured by expanding the gas over a given pressure range is the _____________ work?

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

Which of the following is not affected by temperature changes ?

A. Activity co-efficient
B. Fugacity
C. Free energy
D. None of these

Helmholtz free energy A. is defined as____________________?

A. A = H + TS
B. A = E – TS
C. A = H – TS
D. None of these

In an ideal refrigeration cycle, the change in internal energy of the fluid is_____________?

A. -ve
B. +ve
C. 0
D. Either of the above three; depends on the nature of refrigerant

Melting of ice is an example of an _____________ process?

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

Which of the following equations is used for the prediction of activity co-efficient from experiments ?

A. Margules equation
B. Van Laar equation
C. Wilson’s equation
D. All A, B. and C

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?

A. Δ S1 is always = Δ SR
C. Δ S1 is always > Δ SR
D. Δ S1 is always > Δ SR

The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

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

Measurement of thermodynamic property of temperature is facilitated by ____________ law of thermodynamics?

A. 3rd
B. Zeroth
C. 1st
D. None of these

Refrigeration cycle_________________?

A. Violates second law of thermodynamics
B. Involves transfer of heat from low temperature to high temperature
C. Both of the above
D. Neither of the above

In the reaction, C + O2 → CO2; ΔH = – 94 kcal. What is the heat content (enthalpy) of O2 ?

A. > -94 kcal
B. -94 kcal
C. < – 94 kcal
D. Zero

On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ?

A. (∂P/∂V)S = [(∂P/∂V)T]Y
B. (∂P/∂V)S = (∂P/∂V)T
C. (∂P/∂V)S = y(∂P/∂V)T
D. (∂P/∂V)S = 1/y(∂P/∂V)T

“At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the __________________?

A. Third law of thermodynamics
B. Second law of thermodynamics
C. Maxwell’s relations
D. Nernst heat theorem

In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?

A. Enhanced COP
B. No change in the value of COP
C. Decreased COP
D. Increased or decreased COP; depending upon the type of refrigerant

Which of the following identities can be most easily used to verify steam table data for superheated steam ?

A. (∂T/∂P)S = (∂V/∂S)P
B. (∂T/∂V)S = (∂p/∂S)V
C. (∂P/∂T)V = (∂S/∂V)T
D. (∂V/∂T)P = -(∂S/∂P)T

New Thermodynamics MCQs – Most Latest Chemical Engineering MCQs

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