Cv for an ideal gas__________________?

Does not depend upon temperature

Is independent of pressure only

Is independent of both pressure and volume

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

Not liquify (barring exceptions)

Never liquify however high the pressure may be

Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?

Mutual solubility of the two liquids shows a decreasing trend

A homogeneous solution (say of phenol water) is formed

Mutual solubility of the two liquids shows a decreasing trend

Two liquids are completely separated into two layers

Critical compressibility factor for all substances___________________?

Vary as square of the absolute temperature

Are more or less constant (vary from 0.2 to 0.3)

Vary as square of the absolute temperature

Vary as square of the absolute pressure

Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?

Use of only one graph for all gases

Compressibility factor of a gas is___________________?

Not a function of its temperature

Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?

Same at the same reduced temperature

Same at the same reduced pressure

Compressibility factor for almost all the gases are approximately same at the same__________________?

Critical pressure and critical temperature

Reduced pressure and reduced temperature

Critical pressure and critical temperature

Compound having large heat of formation is_____________________?

Not at all stable (like nascent O2)

Either more or less stable; depends on the compound

Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?

Work required to refrigeration obtained

Refrigeration obtained to the work required

Clausius-Clapeyron Equation gives accurate result, when the __________________?

Vapour pressure is relatively low and the temperature does not vary over wide limits

Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

Volume in the liquid state is negligible compared with that in the vapour state

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

Following a constant pressure cycle

Clapeyron Equation deals with the____________________?

Effect of an inert gas on vapour pressure

Rate of change of vapour pressure with temperature

Effect of an inert gas on vapour pressure

Calculation of ΔF for spontaneous phase change

Temperature dependence of heat of phase transition

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

Pressure must be kept below 5.2 atm

Temperature must be kept above – 57°C

Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C

Pressure and temperature must be kept below 5.2 atm. and – 57°C respectively

Chemical potential is a/an_____________________?

Force which drives the chemical system to equilibrium

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

Energy transformation from one form to another

_____________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low?

A combination of separating & throttling

Boyle’s law for gases states that____________________?

P ∝ V, at constant temperature & mass of the gas

P ∝ 1/V, when temperature is constant

P ∝ 1/V, when temperature & mass of the gas remain constant

P ∝ V, at constant temperature & mass of the gas

At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?

More or less; depending on the system

At the critical point of a substance____________?

Liquid and vapour have the same density

There is no distinction between liquid and vapour phases

456 + Mcqs in Thermodynamics for Chemical in Chemical Engineering Page 8 McqOptions

351.	During adiabatic expansion of gas___________________?
A.	Pressure remains constant
B.	Pressure is increased
C.	Temperature remains constant
D.	None of these
Answer» E.

Discussion

352.	During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?
A.	+ve
B.	0
C.	-ve
D.	∞
Answer» B. 0

Discussion

353.	During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?
A.	+ve
B.	0
C.	-ve
D.	∞
Answer» B. 0

Discussion

354.	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.	Separating
C.	Bucket
D.	Throttling
Answer» B. Separating

Discussion

355.	“Dry ice” is________________?
A.	Moisture free ice
B.	Solid helium
C.	Solid carbon dioxide
D.	None of these
Answer» D. None of these

Discussion

356.	Domestic refrigerator usually works on the _____________ refrigeration cycle?
A.	Carnot
B.	Air
C.	Absorption
D.	vapour-ejection
Answer» D. vapour-ejection

Discussion

357.	____________ does not change during phase transformation processes like sublimation, melting & vaporisation?
A.	Entropy
B.	Gibbs free energy
C.	Internal energy
D.	All (A), B. & (C)
Answer» C. Internal energy

Discussion

358.	Degrees of freedom at triple point will be______________?
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

359.	Degree of freedom of the system ice-water-vapour will be ________________?
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

360.	Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be_________________?
A.	0
B.	1
C.	2
D.	3
Answer» E.

Discussion

361.	________________ decreases during adiabatic throttling of a perfect gas?
A.	Entropy
B.	Temperature
C.	Enthalpy
D.	Pressure
Answer» E.

Discussion

362.	Cv is given by__________________?
A.	(∂E/∂T)V
B.	(∂E/∂V)T
C.	(∂E/∂P)V
D.	(∂V/∂T)P
Answer» B. (∂E/∂V)T

Discussion

363.	Cv for an ideal gas__________________?
A.	Does not depend upon temperature
B.	Is independent of pressure only
C.	Is independent of volume only
D.	Is independent of both pressure and volume
Answer» E.

Discussion

364.	Critical temperature is defined as the temperature above which a gas will____________________?
A.	Not liquify (barring exceptions)
B.	Immediately liquify
C.	Never liquify however high the pressure may be
D.	None of these
Answer» D. None of these

Discussion

365.	Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?
A.	A homogeneous solution (say of phenol water) is formed
B.	Mutual solubility of the two liquids shows a decreasing trend
C.	Two liquids are completely separated into two layers
D.	None of these
Answer» B. Mutual solubility of the two liquids shows a decreasing trend

Discussion

366.	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 temperature
C.	Vary as square of the absolute pressure
D.	None of these
Answer» B. Vary as square of the absolute temperature

Discussion

367.	Cp of a gas at its critical temperature and pressure_______________?
A.	Becomes zero
B.	Becomes infinity
C.	Equals 1 kcal/kmol °K
D.	Equals 0.24 kcal/kmol °K
Answer» C. Equals 1 kcal/kmol °K

Discussion

368.	Cp – Cv = R is valid for ______________ gases?
A.	Ideal
B.	Very high pressure
C.	Very low temperature
D.	All of the above
Answer» B. Very high pressure

Discussion

369.	COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?
A.	0.5
B.	3.5
C.	4.5
D.	8.5
Answer» C. 4.5

Discussion

370.	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
Answer» C. > 94 kcal

Discussion

371.	Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?
A.	Use of only one graph for all gases
B.	Covering of wide range
C.	Easier plotting
D.	More accurate plotting
Answer» B. Covering of wide range

Discussion

372.	Compressibility factor of a gas is___________________?
A.	Not a function of its pressure
B.	Not a function of its nature
C.	Not a function of its temperature
D.	Unity, if it follows PV = nRT
Answer» B. Not a function of its nature

Discussion

373.	Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?
A.	Always greater than one
B.	Same at the same reduced temperature
C.	Same at the same reduced pressure
D.	Both B. & C
Answer» E.

Discussion

374.	Compressibility factor for almost all the gases are approximately same at the same__________________?
A.	Pressure and temperature
B.	Reduced pressure and reduced temperature
C.	Critical pressure and critical temperature
D.	None of these
Answer» C. Critical pressure and critical temperature

Discussion

375.	Compound having large heat of formation is_____________________?
A.	More stable
B.	Less stable
C.	Not at all stable (like nascent O2)
D.	Either more or less stable; depends on the compound
Answer» B. Less stable

Discussion

376.	Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?
A.	T2/(T1 – T2)
B.	T1/(T1 – T2)
C.	(T1 – T2)/T1
D.	(T1 – T2)/T2
Answer» B. T1/(T1 – T2)

Discussion

377.	Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?
A.	Work required to refrigeration obtained
B.	Refrigeration obtained to the work required
C.	Lower to higher temperature
D.	Higher to lower temperature
Answer» C. Lower to higher temperature

Discussion

378.	Clausius-Clapeyron Equation gives accurate result, when the __________________?
A.	Vapour pressure is relatively low and the temperature does not vary over wide limits
B.	Vapour obeys the ideal gas law and the latent heat of vaporisation is constant
C.	Volume in the liquid state is negligible compared with that in the vapour state
D.	All A, B. and C
Answer» E.

Discussion

379.	Clausius-Clapeyron equation is applicable to _____________ equilibrium processes?
A.	Solid-vapor
B.	Solid-liquid
C.	Liquid-vapor
D.	All A, B. and C
Answer» E.

Discussion

380.	Claude’s liquefaction process employs the cooling of gases by__________________?
A.	Expansion in an engine
B.	Following a constant pressure cycle
C.	Throttling
D.	None of these
Answer» B. Following a constant pressure cycle

Discussion

381.	Claude gas liquefaction process employs cooling___________________?
A.	At constant pressure
B.	By throttling
C.	By expansion in an engine
D.	None of these
Answer» D. None of these

Discussion

382.	Clapeyron Equation deals with the____________________?
A.	Rate of change of vapour pressure with temperature
B.	Effect of an inert gas on vapour pressure
C.	Calculation of ΔF for spontaneous phase change
D.	Temperature dependence of heat of phase transition
Answer» B. Effect of an inert gas on vapour pressure

Discussion

383.	Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm) ?
A.	Pressure must be kept below 5.2 atm
B.	Temperature must be kept above – 57°C
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
Answer» E.

Discussion

384.	Chemical potential of ith component of a system is given by________________?
A.	μi = (∂F/∂ni)T, P, ni
B.	μi = (∂A/∂ni)T, P, ni
C.	μi = (∂F/∂ni)T, P
D.	μi = (∂A/∂ni)T, P
Answer» B. μi = (∂A/∂ni)T, P, ni

Discussion

385.	Chemical potential is a/an_____________________?
A.	Extensive property
B.	Intensive property
C.	Force which drives the chemical system to equilibrium
D.	Both B. and C
Answer» E.

Discussion

386.	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.	0
B.	1
C.	∞
D.	None of these
Answer» C. ∞

Discussion

387.	Chemical engineering thermodynamics is concerned with the ____________ in/of chemical processes?
A.	Reaction mechanism
B.	Calculation of rates
C.	Energy transformation from one form to another
D.	None of these
Answer» D. None of these

Discussion

388.	Charles’ law for gases states that__________________?
A.	V/T = Constant
B.	V ∝ 1/T
C.	V ∝ 1/P
D.	PV/T = Constant
Answer» B. V ∝ 1/T

Discussion

389.	Change of state namely evaporation condensation, freezing and melting is an _______________ process?
A.	Isothermal
B.	Adiabatic
C.	Isobaric
D.	Isochoric
Answer» B. Adiabatic

Discussion

390.	Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?
A.	Calorific value
B.	Heat of reaction
C.	Heat of combustion
D.	Heat of formation
Answer» D. Heat of formation

Discussion

391.	_____________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low?
A.	Bucket
B.	Throttling
C.	Separating
D.	A combination of separating & throttling
Answer» E.

Discussion

392.	Boyle’s law for gases states that____________________?
A.	P ∝ 1/V, when temperature is constant
B.	P ∝ 1/V, when temperature & mass of the gas remain constant
C.	P ∝ V, at constant temperature & mass of the gas
D.	P/V = constant, for any gas
Answer» C. P ∝ V, at constant temperature & mass of the gas

Discussion

393.	Boiling of liquid is accompanied with increase in the__________________?
A.	Vapor pressure
B.	Specific Gibbs free energy
C.	Specific entropy
D.	All (A), B. and (C)
Answer» B. Specific Gibbs free energy

Discussion

394.	At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?
A.	More
B.	Less
C.	Same
D.	More or less; depending on the system
Answer» D. More or less; depending on the system

Discussion

395.	At the critical point of a substance____________?
A.	The surface tension vanishes
B.	Liquid and vapour have the same density
C.	There is no distinction between liquid and vapour phases
D.	All A, B. and C
Answer» E.

Discussion

396.	“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.	Nernst heat theorem
D.	Maxwell’s relations
Answer» B. Second law of thermodynamics

Discussion

397.	At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?
A.	Eutectic
B.	Triple
C.	Plait
D.	Critical
Answer» C. Plait

Discussion

398.	At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?
A.	72
B.	92
C.	142
D.	192
Answer» C. 142

Discussion

399.	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°+ R ln f
C.	μ° + T ln f
D.	μ° + R/T ln f
Answer» B. μ°+ R ln f

Discussion

400.	At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________?
A.	Zero
B.	One
C.	Infinity
D.	Negative
Answer» C. Infinity

Discussion

Explore topic-wise MCQs in Chemical Engineering.

During adiabatic expansion of gas___________________?

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

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

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?

“Dry ice” is________________?

Domestic refrigerator usually works on the _____________ refrigeration cycle?

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

Degrees of freedom at triple point will be______________?

Degree of freedom of the system ice-water-vapour will be ________________?

Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be_________________?

________________ decreases during adiabatic throttling of a perfect gas?

Cv is given by__________________?

Cv for an ideal gas__________________?

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

Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?

Critical compressibility factor for all substances___________________?

Cp of a gas at its critical temperature and pressure_______________?

Cp – Cv = R is valid for ______________ gases?

COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?

Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?

Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates__________________?

Compressibility factor of a gas is___________________?

Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?

Compressibility factor for almost all the gases are approximately same at the same__________________?

Compound having large heat of formation is_____________________?

Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?

Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?

Clausius-Clapeyron Equation gives accurate result, when the __________________?

Clausius-Clapeyron equation is applicable to _____________ equilibrium processes?

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

Claude gas liquefaction process employs cooling___________________?

Clapeyron Equation deals with the____________________?

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

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

Chemical potential is a/an_____________________?

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________________?

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

Charles’ law for gases states that__________________?

Change of state namely evaporation condensation, freezing and melting is an _______________ process?

Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?

_____________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low?

Boyle’s law for gases states that____________________?

Boiling of liquid is accompanied with increase in the__________________?

At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?

At the critical point of a substance____________?

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

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

At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?

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.) ?

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