8247 + Mcqs in Chemical Engineering Page 65 McqOptions

3201.	Which of the following has the minimum value of COP for a given refrigeration effect?
A.	Reverse Carnot cycle.
B.	Ordinary vapour-compression cycle.
C.	Vapour-compression process with a reversible expansion engine.
D.	Air refrigeration cycle.
Answer» E.

Discussion

3202.	__________ decreases during adiabatic throttling of a perfect gas.
A.	Entropy
B.	Temperature
C.	Enthalpy
D.	Pressure
Answer» E.

Discussion

3203.	The work done in isothermal compression compared to that in adiabatic compression will be
A.	less
B.	more
C.	same
D.	more or less depending upon the extent of work done
Answer» C. same

Discussion

3204.	Pick out the Claussius-Clayperon equation from the following:
A.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-66-1.png">
B.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-66-2.png">
C.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-59-1.png">
D.	none of these
Answer» C. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-59-1.png">

Discussion

3205.	For organic compounds, group contribution method can be used for the estimation of
A.	critical properties.
B.	specific gravity.
C.	specific volume.
D.	thermal conductivity.
Answer» B. specific gravity.

Discussion

3206.	Specific __________ does not change during phase change at constant temperature and pressure.
A.	entropy
B.	Gibbs energy
C.	internal energy
D.	enthalpy
Answer» C. internal energy

Discussion

3207.	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 vapour phase.
B.	more in liquid phase.
C.	same in both the phases.
D.	replaced by chemical potential which is more in vapour phase.
Answer» D. replaced by chemical potential which is more in vapour phase.

Discussion

3208.	4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is
A.	4 J
B.
C.	0
D.	8 J
Answer» D. 8 J

Discussion

3209.	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

3210.	Throttling (Joule-Thomson effect) process is a constant __________ process.
A.	enthalpy
B.	entropy
C.	pressure
D.	none of these
Answer» B. entropy

Discussion

3211.	The Joule-Thomson co-efficient is defined as ( T/ P)H. Its value at the inversion point is
A.
B.	1
C.	0
D.	-ve
Answer» D. -ve

Discussion

3212.	Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.
A.	decreases
B.	decreases exponentially
C.	increases
D.	remains constant
Answer» D. remains constant

Discussion

3213.	Entropy is a/an
A.	state function
B.	macroscopic property
C.	extensive property
D.	none of these
Answer» E.

Discussion

3214.	In the reaction, represented by, 2SO2 + O2 2SO3; H = - 42 kcal; the forward reaction will be favoured by
A.	low temperature
B.	high pressure
C.	both (a) and (b)
D.	neither (a) nor (b)
Answer» D. neither (a) nor (b)

Discussion

3215.	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

3216.	Entropy change for an irreversible isolated system is
A.
B.	0
C.	< 0
D.	> 0
Answer» E.

Discussion

3217.	Maxwell's relation corresponding to the identity, dH = dS = Vdp + i dni is
A.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-495-1.png">
B.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-495-2.png">
C.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-495-3.png">
D.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/427-495-4.png">
Answer» E.

Discussion

3218.	Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.
A.	the same
B.	less than
C.	greater than
D.	different than
Answer» B. less than

Discussion

3219.	The unit of equilibrium constant of a chemical reaction is the same as that of
A.	molar concentration
B.	temperature
C.	internal energy
D.	none of these
Answer» E.

Discussion

3220.	Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is
A.	1
B.	4
C.	2
D.	3
Answer» D. 3

Discussion

3221.	The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its
A.	pressure
B.	volume
C.	temperature
D.	all (a), (b) & (c).
Answer» D. all (a), (b) & (c).

Discussion

3222.	"When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs". This phenomenon is related to the
A.	Gibbs-Duhem equation
B.	Gibbs-Helmholtz equation
C.	Third law of thermodynamics
D.	Joule-Thomson effect
Answer» E.

Discussion

3223.	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

3224.	"Dry ice" is
A.	moisture free ice
B.	solid helium
C.	solid carbon dioxide
D.	none of these
Answer» D. none of these

Discussion

3225.	Cv is given by
A.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-1.png">
B.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-2.png">
C.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-3.png">
D.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-4.png">
Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/394-49-2.png">

Discussion

3226.	Which of the following non-flow reversible compression processes require maximum work ?
A.	Adiabatic process
B.	Isothermal process
C.	Isobaric process
D.	All require same work
Answer» B. Isothermal process

Discussion

3227.	"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.	Kopp's rule.
C.	law of corresponding state.
D.	Arrehenius hypothesis.
Answer» B. Kopp's rule.

Discussion

3228.	The shape of T-S diagram for Carnot Cycle is a
A.	rectangle
B.	rhombus
C.	trapezoid
D.	circle
Answer» B. rhombus

Discussion

3229.	For an isothermal process, the internal energy of a gas
A.	increases
B.	decreases
C.	remains unchanged
D.	data insufficient, can't be predicted
Answer» D. data insufficient, can't be predicted

Discussion

3230.	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

3231.	Gibbs phase rule finds application, when heat transfer occurs by
A.	conduction
B.	convection
C.	radiation
D.	condensation
Answer» E.

Discussion

3232.	Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of
A.	sublimation
B.	fusion
C.	transition
D.	vaporisation
Answer» D. vaporisation

Discussion

3233.	Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400 C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is
A.	superheated vapour.
B.	partially condensed vapour with quality of 0.9.
C.	saturated vapour.
D.	partially condensed vapour with quality of 0.1.
Answer» B. partially condensed vapour with quality of 0.9.

Discussion

3234.	An isentropic process is carried out at constant
A.	volume
B.	pressure
C.	temperature
D.	all (a), (b) and (c)
Answer» B. pressure

Discussion

3235.	All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.
A.	oxygen
B.	nitrogen
C.	air
D.	hydrogen
Answer» E.

Discussion

3236.	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.	chemical potentials of all components should be same in a particular phase.
C.	sum of the chemical potentials of any given component in all the phases should be the same.
D.	none of these.
Answer» B. chemical potentials of all components should be same in a particular phase.

Discussion

3237.	In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process.
A.	isothermal
B.	adiabatic
C.	isentropic
D.	polytropic
Answer» D. polytropic

Discussion

3238.	The ammonia synthesis reaction represented by N2 + 3H2 2NH3 ; H = - 22.4 kcal, is
A.	endothermic
B.	exothermic
C.	isothermal
D.	adiabatic
Answer» C. isothermal

Discussion

3239.	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

3240.	The temperature at the eutectic point of the system is the __________ temperature that can be attained in the system.
A.	lowest
B.	highest
C.	average
D.	none of these
Answer» B. highest

Discussion

3241.	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

3242.	Fugacity co-efficient of a substance is the ratio of its fugacity to
A.	mole fraction
B.	activity
C.	pressure
D.	activity co-efficient
Answer» D. activity co-efficient

Discussion

3243.	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.	224
C.	22.4
D.	data insufficient; can't be computed
Answer» B. 224

Discussion

3244.	Rotary lime kiln is an example of a/an __________ system.
A.	closed
B.	open
C.	isolated
D.	non-thermodynamic
Answer» C. isolated

Discussion

3245.	Heat of reaction is
A.	dependent on pressure only.
B.	dependent on temperature only.
C.	dependent on both pressure and temperature.
D.	independent of temperature changes.
Answer» D. independent of temperature changes.

Discussion

3246.	The expression, , is for the____of an ideal gas.
A.	compressibility
B.	work done under adiabatic contition
C.	work done under isothermal condition
D.	co-efficient of thermal expansion
Answer» D. co-efficient of thermal expansion

Discussion

3247.	What happens in a reversible adiabatic expansion process ?
A.	Heating takes place.
B.	Cooling takes place.
C.	Pressure is constant.
D.	Temperature is constant.
Answer» C. Pressure is constant.

Discussion

3248.	The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is
A.	less pronounced
B.	more pronounced
C.	equal
D.	data insufficient, can't be predicted.
Answer» C. equal

Discussion

3249.	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

3250.	As the time is passing, entropy of the universe
A.	is increasing
B.	is decreasing
C.	remains constant
D.	data insufficient, can't be predicted
Answer» B. is decreasing

Discussion

Explore topic-wise MCQs in Engineering.

Which of the following has the minimum value of COP for a given refrigeration effect?

__________ decreases during adiabatic throttling of a perfect gas.

The work done in isothermal compression compared to that in adiabatic compression will be

Pick out the Claussius-Clayperon equation from the following:

For organic compounds, group contribution method can be used for the estimation of

Specific __________ does not change during phase change at constant temperature and pressure.

When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

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

Throttling (Joule-Thomson effect) process is a constant __________ process.

The Joule-Thomson co-efficient is defined as ( T/ P)H. Its value at the inversion point is

Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.

Entropy is a/an

In the reaction, represented by, 2SO2 + O2 2SO3; H = - 42 kcal; the forward reaction will be favoured by

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

Entropy change for an irreversible isolated system is

Maxwell's relation corresponding to the identity, dH = dS = Vdp + i dni is

Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.

The unit of equilibrium constant of a chemical reaction is the same as that of

Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is

The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its

"When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs". This phenomenon is related to the

The internal energy of an ideal gas does not change in a reversible __________ process.

"Dry ice" is

Cv is given by

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

"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

The shape of T-S diagram for Carnot Cycle is a

For an isothermal process, the internal energy of a gas

Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates

Gibbs phase rule finds application, when heat transfer occurs by

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

Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400 C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

An isentropic process is carried out at constant

All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

The necessary condition for phase equilibrium in a multiphase system of N components is that the

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

The ammonia synthesis reaction represented by N2 + 3H2 2NH3 ; H = - 22.4 kcal, is

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

The temperature at the eutectic point of the system is the __________ temperature that can be attained in the system.

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

Fugacity co-efficient of a substance is the ratio of its fugacity to

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.

Rotary lime kiln is an example of a/an __________ system.

Heat of reaction is

The expression, , is for the____of an ideal gas.

What happens in a reversible adiabatic expansion process ?

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) 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.

As the time is passing, entropy of the universe