_The extensive properties are$?

Volume, mass and number of moles

Free energy, entropy and enthalpy

_In case of the decomposition of hydroiodic acid (2HI ‚Äö√°√£ H‚Äö√á√á + I‚Äö√á√á), addition of H‚Äö√á√á (at equilibrium condition) will$?

Increase the partial pressure of I‚Äö√á√á

Decrease the partial pressure of HI

Diminish the degree of dissociation of HI

_Grams of butane (C‚Äö√á√ëH‚Äö√á√Ö‚Äö√á√Ñ) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be$?

Data insufficient; can't be computed

_Pick out the correct statement.$?

A real gas on expansion in vacuum gets heated up

An ideal gas on expansion in vacuum gets cooled

An ideal gas on expansion in vacuum gets heated up

A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

_Entropy of the system decreases, when$?

A gas expands spontaneously from high pressure to low pressure

_The thermodynamic law, PVy = constant, is not applicable in case of$?

Adiabatic expansion of steam in a turbine

Adiabatic compression of a perfect gas

(‚Äö√ √áT/‚Äö√ √áP)H is the mathematical expression for$?

Specific heat at constant pressure (Cp)

Specific heat at constant volume (Cv)

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

For some gases, Virial equations and ideal gas equations are the same

Virial co-efficients are universal constants

Virial co-efficients are function of temperature only

For some gases, Virial equations and ideal gas equations are the same

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

0¬¨‚àûC and 1 kgf/cm¬¨‚â§

Which of the following is an undesirable characteristics of a refrigerant ?$?

Its vapor pressure at the condenser temperature should be very high

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

Its vapor pressure at the condenser temperature should be very high

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?$?

Vapor compression cycle using expansion valve

Vapor compression cycle using expansion engine

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 (‚Äö√ √áP/‚Äö√ √áV)S and the slope of the reversible isothermal line (‚Äö√ √áP/‚Äö√ √áV)T are related as (where, y = Cp/Cv))$?

(‚Äö√ √áP/‚Äö√ √áV)S = 1/y(‚Äö√ √áP/‚Äö√ √áV)T

(‚Äö√ √áP/‚Äö√ √áV)S = (‚Äö√ √áP/‚Äö√ √áV)T

(‚Äö√ √áP/‚Äö√ √áV)S = [(‚Äö√ √áP/‚Äö√ √áV)T]Y

(‚Äö√ √áP/‚Äö√ √áV)S = y(‚Äö√ √áP/‚Äö√ √áV)T

(‚Äö√ √áP/‚Äö√ √áV)S = 1/y(‚Äö√ √áP/‚Äö√ √áV)T

Internal energy of an ideal gas$?

Increases with increase in pressure

Decreases with increase in temperature

For a spontaneous process, free energy$?

Decreases whereas the entropy increases

Ideal refrigeration cycle is$?

Dependent on the refrigerant's properties

The least efficient of all refrigeration processes

Claude's liquefaction process employs the cooling of gases by$?

Following a constant pressure cycle

469 + Mcqs in Chemical Engineering Thermodynamics in Chemical Engineering Page 7 McqOptions

301.	_The extensive properties are$?
A.	Volume, mass and number of moles
B.	Free energy, entropy and enthalpy
C.	Both A and B
D.	None of these
Answer» D. None of these

Discussion

302.	_Fugacity and pressure are numerically equal, when the gas is$?
A.	In standard state
B.	At high pressure
C.	At low temperature
D.	In ideal state
Answer» E.

Discussion

303.	_In a turbine, the fluid expands almost$?
A.	Isothermally
B.	Isobarically
C.	Adiabatically
D.	None of these
Answer» D. None of these

Discussion

304.	_In case of the decomposition of hydroiodic acid (2HI ‚Äö√°√£ H‚Äö√á√á + I‚Äö√á√á), addition of H‚Äö√á√á (at equilibrium condition) will$?
A.	Increase the partial pressure of I‚Äö√á√á
B.	Decrease the partial pressure of HI
C.	Diminish the degree of dissociation of HI
D.	None of these
Answer» D. None of these

Discussion

305.	_Grams of butane (C‚Äö√á√ëH‚Äö√á√Ö‚Äö√á√Ñ) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be$?
A.	580
B.	640
C.	1160
D.	Data insufficient; can't be computed
Answer» D. Data insufficient; can't be computed

Discussion

306.	_The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzman's constant, T = absolute temperature)$?
A.	‚Äö√ √∂(2KT/m)
B.	‚Äö√ √∂(3KT/m)
C.	‚Äö√ √∂(6KT/m)
D.	3KT/m
Answer» C. ‚Äö√ √∂(6KT/m)

Discussion

307.	_Pick out the correct statement.$?
A.	A real gas on expansion in vacuum gets heated up
B.	An ideal gas on expansion in vacuum gets cooled
C.	An ideal gas on expansion in vacuum gets heated up
D.	A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected
Answer» E.

Discussion

308.	_The accentric factor of a materical, '≈ì√¢', is defined as ≈ì√¢ = -log10(Prsat)Tr‚Äö√Ö¬™¬¨œÄ = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always$?
A.	> 2
B.	< 1
C.	> 1
D.	< 3
Answer» C. > 1

Discussion

309.	_The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is$?
A.	3
B.	1
C.	2
D.	0
Answer» C. 2

Discussion

310.	_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.	Kirchoff's
C.	Lavoisier and Laplace
D.	None of these
Answer» B. Kirchoff's

Discussion

311.	_The minimum number of phases that can exist in a system is$?
A.	0
B.	1
C.	2
D.	3
Answer» C. 2

Discussion

312.	_Entropy of the system decreases, when$?
A.	Snow melts into water
B.	A gas expands spontaneously from high pressure to low pressure
C.	Water is converted into ice
D.	Both B & C
Answer» E.

Discussion

313.	_Heat of formation of an element in its standard state is$?
A.	0
B.	< 0
C.	> 0
D.	A function of pressure
Answer» B. < 0

Discussion

314.	_Kopp's rule is used to calculate the heat capacity of$?
A.	Solids
B.	Liquids
C.	Gases
D.	All of the above
Answer» B. Liquids

Discussion

315.	_The thermodynamic law, PVy = constant, is not applicable in case of$?
A.	Ideal compression of air
B.	Free expansion of an ideal gas
C.	Adiabatic expansion of steam in a turbine
D.	Adiabatic compression of a perfect gas
Answer» C. Adiabatic expansion of steam in a turbine

Discussion

316.	_If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.$?
A.	100
B.	50
C.	205
D.	200
Answer» E.

Discussion

317.	_The internal energy of an ideal gas does not change in a reversible __________ process.$?
A.	Isothermal
B.	Adiabatic
C.	Isobaric
D.	Isometric
Answer» B. Adiabatic

Discussion

318.	_Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is$?
A.	2
B.	0
C.	1
D.	3
Answer» B. 0

Discussion

319.	___________ equation predicts the activity co-efficient from experimental data.$?
A.	Lewis-Randall
B.	Margules
C.	Van Laar
D.	Both B & C
Answer» E.

Discussion

320.	Henry's law is closely obeyed by a gas, when its __________ is extremely high.$?
A.	Pressure
B.	Solubility
C.	Temperature
D.	None of these
Answer» E.

Discussion

321.	Equation which relates pressure, volume and temperature of a gas is called the$?
A.	Equation of state
B.	Gibbs Duhem equation
C.	Ideal gas equation
D.	None of these
Answer» B. Gibbs Duhem equation

Discussion

322.	(‚Äö√ √áT/‚Äö√ √áP)H is the mathematical expression for$?
A.	Specific heat at constant pressure (Cp)
B.	Specific heat at constant volume (Cv)
C.	Joule-Thompson co-efficient
D.	None of these
Answer» D. None of these

Discussion

323.	The work done in an adiabatic change in a particular gas depends upon changes in the __________ only.$?
A.	Temperature
B.	Specific heat
C.	Volume
D.	Pressure
Answer» B. Specific heat

Discussion

324.	Entropy is a/an$?
A.	State function
B.	Macroscopic property
C.	Extensive property
D.	None of these
Answer» E.

Discussion

325.	The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is$?
A.	0
B.	‚Äö√ √ª
C.	+ve
D.	-ve
Answer» D. -ve

Discussion

326.	Which of the following is true for Virial equation of state?$?
A.	Virial co-efficients are universal constants
B.	Virial co-efficients
C.	Virial co-efficients are function of temperature only
D.	For some gases, Virial equations and ideal gas equations are the same
Answer» D. For some gases, Virial equations and ideal gas equations are the same

Discussion

327.	Normal temperature and pressure (N.T.P.) corresponds to$?
A.	0¬¨‚àûC and 760 mm Hg
B.	15¬¨‚àûC and 760 mm Hg
C.	20¬¨‚àûC and 760 mm Hg
D.	0¬¨‚àûC and 1 kgf/cm¬¨‚â§
Answer» D. 0¬¨‚àûC and 1 kgf/cm¬¨‚â§

Discussion

328.	Which of the following decreases with increase in pressure?$?
A.	Melting point of ice
B.	Melting point of wax
C.	Boiling point of liquids
D.	None of these
Answer» B. Melting point of wax

Discussion

329.	In a homogeneous solution, the fugacity of a component depends upon the$?
A.	Pressure
B.	Composition
C.	Temperature
D.	All of the above
Answer» E.

Discussion

330.	Fundamental principle of refrigeration is based on the __________ law of thermodynamics.$?
A.	Zeroth
B.	First
C.	Second
D.	Third
Answer» D. Third

Discussion

331.	A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature.$?
A.	Less than
B.	More than
C.	Equal to or higher than
D.	Less than or equal to
Answer» E.

Discussion

332.	If two gases have same reduced temperature and reduced pressure, then they will have the same$?
A.	Volume
B.	Mass
C.	Critical temperature
D.	None of these
Answer» E.

Discussion

333.	The quantitative effect of temperature on chemical equilibrium is given by the$?
A.	Vant-Hoff equation
B.	Le-Chatelier's principle
C.	Arhenius equation
D.	None of these
Answer» B. Le-Chatelier's principle

Discussion

334.	Which of the following is an undesirable characteristics of a refrigerant ?$?
A.	It should be non-explosive
B.	It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
C.	Its vapor pressure at the condenser temperature should be very high
D.	None of these
Answer» C. Its vapor pressure at the condenser temperature should be very high

Discussion

335.	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.	Air refrigeration cycle
C.	Vapor compression cycle using expansion engine
D.	Carnot refrigeration cycle
Answer» E.

Discussion

336.	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 (‚Äö√ √áP/‚Äö√ √áV)S and the slope of the reversible isothermal line (‚Äö√ √áP/‚Äö√ √áV)T are related as (where, y = Cp/Cv))$?
A.	(‚Äö√ √áP/‚Äö√ √áV)S = (‚Äö√ √áP/‚Äö√ √áV)T
B.	(‚Äö√ √áP/‚Äö√ √áV)S = [(‚Äö√ √áP/‚Äö√ √áV)T]Y
C.	(‚Äö√ √áP/‚Äö√ √áV)S = y(‚Äö√ √áP/‚Äö√ √áV)T
D.	(‚Äö√ √áP/‚Äö√ √áV)S = 1/y(‚Äö√ √áP/‚Äö√ √áV)T
Answer» D. (‚Äö√ √áP/‚Äö√ √áV)S = 1/y(‚Äö√ √áP/‚Äö√ √áV)T

Discussion

337.	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.	Kinematic viscosity
B.	Work
C.	Temperature
D.	None of these
Answer» E.

Discussion

338.	Entropy is a measure of the __________ of a system.$?
A.	Disorder
B.	Orderly behaviour
C.	Temperature changes only
D.	None of these
Answer» B. Orderly behaviour

Discussion

339.	What is the value of Joule-Thomson co-efficient for an ideal gas?$?
A.	+ve
B.	-ve
C.	0
D.	‚Äö√ √ª
Answer» D. ‚Äö√ √ª

Discussion

340.	Internal energy of an ideal gas$?
A.	Increases with increase in pressure
B.	Decreases with increase in temperature
C.	Is independent of temperature
D.	None of these
Answer» E.

Discussion

341.	Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?$?
A.	Expansion valve
B.	Condenser
C.	Refrigerator
D.	Compressor
Answer» E.

Discussion

342.	Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a$?
A.	Straight line
B.	Sine curve
C.	Parabola
D.	Hyperbola
Answer» B. Sine curve

Discussion

343.	For a spontaneous process, free energy$?
A.	Is zero
B.	Increases
C.	Decreases whereas the entropy increases
D.	And entropy both decrease
Answer» D. And entropy both decrease

Discussion

344.	Joule-Thomson co-efficient depends on the$?
A.	Pressure
B.	Temperature
C.	Both A & B
D.	Neither A nor B
Answer» D. Neither A nor B

Discussion

345.	With increase in temperature, the atomic heat capacities of all solid elements$?
A.	Increases
B.	Decreases
C.	Remains unchanged
D.	Decreases linearly
Answer» B. Decreases

Discussion

346.	Ideal refrigeration cycle is$?
A.	Same as Carnot cycle
B.	Same as reverse Carnot cycle
C.	Dependent on the refrigerant's properties
D.	The least efficient of all refrigeration processes
Answer» C. Dependent on the refrigerant's properties

Discussion

347.	The internal energy of an ideal gas is a function of its __________ only.$?
A.	Molecular size
B.	Volume
C.	Pressure
D.	Temperature
Answer» E.

Discussion

348.	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

349.	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 number of degrees of freedom are$?
A.	1
B.	2
C.	3
D.	0
Answer» C. 3

Discussion

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

Discussion

Explore topic-wise MCQs in Chemical Engineering.

_The extensive properties are$?

_Fugacity and pressure are numerically equal, when the gas is$?

_In a turbine, the fluid expands almost$?

_In case of the decomposition of hydroiodic acid (2HI ‚Äö√°√£ H‚Äö√á√á + I‚Äö√á√á), addition of H‚Äö√á√á (at equilibrium condition) will$?

_Grams of butane (C‚Äö√á√ëH‚Äö√á√Ö‚Äö√á√Ñ) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be$?

_The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzman's constant, T = absolute temperature)$?

_Pick out the correct statement.$?

_The accentric factor of a materical, '≈ì√¢', is defined as ≈ì√¢ = -log10(Prsat)Tr‚Äö√Ö¬™¬¨œÄ = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always$?

_The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is$?

_If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.$?

_The minimum number of phases that can exist in a system is$?

_Entropy of the system decreases, when$?

_Heat of formation of an element in its standard state is$?

_Kopp's rule is used to calculate the heat capacity of$?

_The thermodynamic law, PVy = constant, is not applicable in case of$?

_If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.$?

_The internal energy of an ideal gas does not change in a reversible __________ process.$?

_Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is$?

___________ equation predicts the activity co-efficient from experimental data.$?

Henry's law is closely obeyed by a gas, when its __________ is extremely high.$?

Equation which relates pressure, volume and temperature of a gas is called the$?

(‚Äö√ √áT/‚Äö√ √áP)H is the mathematical expression for$?

The work done in an adiabatic change in a particular gas depends upon changes in the __________ only.$?

Entropy is a/an$?

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

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

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

Which of the following decreases with increase in pressure?$?

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

Fundamental principle of refrigeration is based on the __________ law of thermodynamics.$?

A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature.$?

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

The quantitative effect of temperature on chemical equilibrium is given by the$?

Which of the following is an undesirable characteristics of a refrigerant ?$?

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?$?

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.$?

Entropy is a measure of the __________ of a system.$?

What is the value of Joule-Thomson co-efficient for an ideal gas?$?

Internal energy of an ideal gas$?

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

Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a$?

For a spontaneous process, free energy$?

Joule-Thomson co-efficient depends on the$?

With increase in temperature, the atomic heat capacities of all solid elements$?

Ideal refrigeration cycle is$?

The internal energy of an ideal gas is a function of its __________ only.$?

Claude's liquefaction process employs the cooling of gases by$?

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 number of degrees of freedom are$?

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