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Chemical Engineering Thermodynamics
Quiz 2
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Q.1
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
Infinity
Unity
Constant
Negative
Q.2
The number of degrees of freedom at the triple point of water is
0
1
2
3
Q.3
Pick out the wrong statement.
The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction
With increase in temperature, the equilibrium constant increases for an exothermic reaction
The equilibrium constant of a reaction depends upon temperature only
The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction
Q.4
The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of
T
T and P
T, P and Z
T and Z
Q.5
Heat of reaction at constant volume is identified with __________ change.
Enthalpy
Internal energy
Either A or B
Neither A nor B
Q.6
Which of the following is an extensive property of a system?
Heat capacity
Molal heat capacity
Pressure
Concentration
Q.7
The expression for entropy change, ΔS = n C
p
. ln (T₂/T₁), is valid for the __________ of a substance.
Simultaneous pressure & temperature change
Heating
Cooling
Both B and C
Q.8
The extensive properties are
Volume, mass and number of moles
Free energy, entropy and enthalpy
Both A and B
None of these
Q.9
The intensive properties are
Molar volume, density, viscosity and boiling point
Refractive index and surface tension
Both A and B
None of these
Q.10
Equilibrium constant decreases as the temperature
Increases, for an exothermic reaction
Decreases, for an exothermic reaction
Increases, for an endothermic reaction
None of these
Q.11
A solid is transformed into vapour without going to the liquid phase at
Triple point
Boiling point
Below triple point
Always
Q.12
Internal energy is equal to the heat absorbed in case of a/an __________ process.
Constant volume
Polytropic
Adiabatic
Constant pressure
Q.13
__________ increases with increase in pressure.
The melting point of wax
The boiling point of a liquid
Both A and B
Neither A nor B
Q.14
Which of the following behaves most closely like an ideal gas?
He
N₂
O₂
H₂
Q.15
The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant C
v
), depends upon its
Pressure
Volume
Temperature
All of the above
Q.16
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
Le-Chatelier principle
Kopp's rule
Law of corresponding state
Arrehenius hypothesis
Q.17
With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure
Increases
Decreases
Remains same
Decreases linearly
Q.18
Throttling process is a/an __________ process.
Reversible and isothermal
Irreversible and constant enthalpy
Reversible and constant entropy
Reversible and constant enthalpy
Q.19
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.
Decreases
Decreases exponentially
Increases
Remains constant
Q.20
Which of the following has the least thermal efficiency?
Steam engine
Carnot engine
Diesel engine
Otto engine
Q.21
A Carnot cycle consists of the following steps :
Two isothermals and two isentropics
Two isobarics and two isothermals
Two isochorics and two isobarics
Two isothermals and two isochorics
Q.22
Gibbs free energy of mixing at constant pressure and temperature is always
0
∞
+ ve
- ve
Q.23
Heating of water under atmospheric pressure is an __________ process.
Isochoric
Isobaric
Adiabatic
Isothermal
Q.24
What happens in a reversible adiabatic compression?
Heating occurs
Cooling occurs
Pressure is constant
Temperature is constant
Q.25
Pick out the wrong statement.
Enthalpies of all elements in their standard states are assumed to be zero
Combustion reactions are never en-dothermic in nature
Heat of reaction at constant volume is equal to the change in internal energy
Claussius-clayperon equation is not applicable to melting process
Q.26
The kinetic energy of gas molecule is zero at
0°C
273°C
100°C
-273°C
Q.27
In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.
0.25
0.5
0.75
1
Q.28
The temperature at which both liquid and gas phases are identical, is called the __________ point.
Critical
Triple
Freezing
Boiling
Q.29
The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.
Internal energy
Enthalpy
Gibbs free energy
Helmholtz free energy
Q.30
As the time is passing, entropy of the universe
Is increasing
Is decreasing
Remains constant
Data insufficient, can't be predicted
Q.31
When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs. This phenomenon is related to the
Gibbs-Duhem equation
Gibbs-Helmholtz equation
Third law of thermodynamics
Joule-Thomson effect
Q.32
Fugacity co-efficient of a substance is the ratio of its fugacity to
Mole fraction
Activity
Pressure
Activity co-efficient
Q.33
Pick out the wrong statement.
Cp of monoatomic gases such as metallic vapor is about 5 kcal/kg. atom
The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state
There is an increase in entropy, when a spontaneous change occurs in an isolated system
At absolute zero temperature, the heat capacity for many pure crystalline substances is zero
Q.34
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.
Isobaric
Isothermal
Adiabatic
None of these
Q.35
The equation, PV = nRT, is best obeyed by gases at
Low pressure & high temperature
High pressure & low temperature
Low pressure & low temperature
None of these
Q.36
Which one is true for a throttling process?
A gas may have more than one inversion temperatures
The inversion temperature is different for different gases
The inversion temperature is same for all gases
The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Q.37
Fugacity and pressure are numerically equal, when the gas is
In standard state
At high pressure
At low temperature
In ideal state
Q.38
Lenz's law results from the law of conservation of
Mass
Momentum
Energy
None of these
Q.39
The variation of heat of reaction with temperature at constant pressure is given by the __________ law.
Kelvin's
Antonie's
Kirchoffs
None of these
Q.40
For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.
Decreases
Increases
Remains same
Decreases linearly
Q.41
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is
Less pronounced
More pronounced
Equal
Data insufficient, can't be predicted
Q.42
"The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is
The statement as per Gibbs-Helmholtz
Called Lewis-Randall rule
Henry's law
None of these
Q.43
Out of the following refrigeration cycles, which one has maximum COP?
Air cycle
Carnot cycle
Ordinary vapor compression cycle
Vapor compression with a reversible expansion engine
Q.44
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be
More
Less
Same
Data insufficient to predict
Q.45
In the equation, PV
n
= constant, if the value of n is in between 1 and y (i.e. C
p
/C
v
), then it represents a reversible __________ process.
Isometric
Polytropic
Isentropic
Isobaric
Q.46
In the equation, PV
n
= constant, if the value of n = ± ∞, then it represents a reversible __________ process.
Adiabatic
Isometric
Isentropic
Isothermal
Q.47
In the equation, PV
n
= constant, if the value of n = 1, then it represents a reversible __________ process.
Isothermal
Isobaric
Polytropic
Adiabatic
Q.48
Pick out the wrong statement.
At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature
Normally, the gases which are easily liquified, are more soluble in common solvents
The gases which are capable of forming ions in aqueous solution, are much more soluble in water than in other solvents
At constant pressure, solubility of a gas in a liquid increases with rise in temperature
Q.49
Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole . °K
0
∞
50
100
Q.50
Entropy change for an irreversible isolated system is
∞
0
< 0
> 0
0 h : 0 m : 1 s
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