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Chemical Engineering
Chemical Engineering Thermodynamics
Quiz 5
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Q.1
Law of corresponding states says that
, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
No gas can be liquified above the critical temperature, howsoever high the pressure may be
The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
Q.2
For an ideal liquid solution, which of the following is unity?
Activity
Fugacity
Activity co-efficient
Fugacity co-efficient
Q.3
The accentric factor of a materical, 'ω', is defined as ω = -log10(P
r
sat
)T
r
⁻¹ = 0.7, where, P
r
sat
= reduced vapor pressure, T
r
= reduced temperature. The value of accentric factor is always
> 2
< 1
> 1
< 3
Q.4
The number of degrees of freedom for a mixture of ice and water (liquid) are
2
3
1
0
Q.5
Kopp's rule is used to calculate the heat capacity of
Solids
Liquids
Gases
All of the above
Q.6
The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature.
Boyle
Inversion
Critical
Reduced
Q.7
If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.
Hess's
Kirchoff's
Lavoisier and Laplace
None of these
Q.8
If atmospheric temperature and dew point are nearly equal, then the relative humidity is
Zero
50%
Almost 100%
Unpredictable
Q.9
The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by
Decrease in enthalpy corresponding to evolution of heat
Decrease of entropy
Increase in enthalpy corresponding to absorption of heat
No change in enthalpy
Q.10
The minimum number of phases that can exist in a system is
0
1
2
3
Q.11
Extensive properties of a thermodynamic system depend upon the __________ of the system.
Specific volume
Temperature
Mass
Pressure
Q.12
What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?
2
0
3
1
Q.13
The first law of thermodynamics is a restatement of the law of conservation of
Mass
Energy
Momentum
None of these
Q.14
For a constant volume process __________ by the system is used only to increase the internal energy.
Heat absorbed
Work done
Both A & B
Neither A nor B
Q.15
Degree of freedom of a system consisting of a gaseous mixture of H₂ and NH₃ will be
0
1
2
3
Q.16
A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
The distribution law
Followed from Margule's equation
A corollary of Henry's law
None of these
Q.17
A system in which there is exchange of energy but not of mass, is called a/an __________ system.
Isolated
Open
Insulated
Closed
Q.18
First law of thermodynamics deals with the
Direction of energy transfer
Reversible processes only
Irreversible processes only
None of these
Q.19
Which of the following is not an equation of state?
Bertholet equation
Clausius Clayperon equation
Beattie-Bridgeman equation
None of these
Q.20
Van Laar equation deals with the activity co-efficients in
Binary solutions
Ternary solutions
Azeotropic mixture only
None of these
Q.21
Entropy of the system decreases, when
Snow melts into water
A gas expands spontaneously from high pressure to low pressure
Water is converted into ice
Both B & C
Q.22
The second law of thermodynamics states that
The energy change of a system undergoing any reversible process is zero
It is not possible to transfer heat from a lower temperature to a higher temperature
The total energy of system and surrounding remains the same
None of the above
Q.23
Which of the following is not a common refrigerant?
Freon-12
Ethylene
Ammonia
Carbon dioxide
Q.24
Which of the following is not a reversible process ?
Expansion of an ideal gas against constant pressure
Atmospheric pressure vaporisation of water at 100°C
Solution of NaCl in water at 50°C
None of these
Q.25
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
Its internal energy (U) decreases and its entropy (S) increases
U and S both decreases
U decreases but S is constant
U is constant but S decreases
Q.26
The expression for entropy change given by, ΔS = - nR ln (P₂/P₁), holds good for
Expansion of a real gas
Reversible isothermal volume change
Heating of an ideal gas
Cooling of a real gas
Q.27
If we increase the pressure on a substance (which is at its triple point), then the triple point
Increases
Decreases
Remains unchanged
May increase or decrease ; depends on the substance
Q.28
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)
Logarithmic
Arithmetic
Geometric
Harmonic
Q.29
Helmholtz free energy (A) is defined as
A = H - TS
A = E - TS
A = H + TS
None of these
Q.30
For spontaneous changes in an isolated system (S = entropy)
Ds = 0
Ds <0
Ds > 0
Ds = Constant
Q.31
A gas performs the maximum work, when it expands
Non-uniformly
Adiabatically
Isobarically
Isothermally
Q.32
Partial molal quantities are important in the study of
Ideal gases
Ideal solutions
Non-ideal mixtures
A pure component
Q.33
For organic compounds, group contribution method can be used for the estimation of
Critical properties
Specific gravity
Specific volume
Thermal conductivity
Q.34
In a P-V diagram (for an ideal gas), an isothermal curve will coincide withan adiabatic curve (through a point), when
C
p
< C
v
C
p
= C
v
C
p
> C
v
C
p
≥ C
v
Q.35
The shape of T-S diagram for Carnot Cycle is a
Rectangle
Rhombus
Trapezoid
Circle
Q.36
For any system, what is the minimum number of degrees of freedom?
1
0
2
3
Q.37
Fugacity is a measure of the
Escaping tendencies of the same substance in different phases of a system
Relative volatility of a mixture of two miscible liquids
Behaviour of ideal gases
None of these
Q.38
Which of the following is not a unit of the equilibrium constant K
p
? (where, Δx = number of moles of products number of moles of reactants)
(atm)
Δx
, when Δx is negative
(atm)
Δx
, when Δx is positive
Dimensionless, when Δx = 0
(atm)
Δx
2
, when Δx > 0
Q.39
Gibbs free energy (F) is defined as
F = E - TS
F = H - TS
F = H + TS
F = E + TS
Q.40
A system is said to be at equilibrium, if the entropy of the system has reached __________ value.
Minimum
Zero
Maximum
None of these
Q.41
The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T₁ and T₂ is given by
T₁/(T₁-T₂)
T₂/(T₁-T₂)
T₁/T₂
T₂/R1
Q.42
Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.
0
273
25
None of these
Q.43
At the critical point of a substance
The surface tension vanishes
Liquid and vapour have the same density
There is no distinction between liquid and vapour phases
All of the above
Q.44
With increase in compression ratio, the efficiency of the otto engine
Increases
Decreases
Remains constant
Increases linearly
Q.45
What is the degree of freedom for a system comprising liquid water equilibrium with its vapour?
0
1
2
3
Q.46
__________ functions are exemplified by heat and work.
Path
Point
State
None of these
Q.47
Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is
Slower than Y
Faster than Y
Three times slower than Y
Three times faster than Y
Q.48
Which of the following has the minimum value of COP for a given refrigeration effect?
Reverse Carnot cycle
Ordinary vapour-compression cycle
Vapour-compression process with a reversible expansion engine
Air refrigeration cycle
Q.49
Sublimation temperature of dry ice (solid CO₂) is __________ °C.
-273
0
-78
5
Q.50
The equation relating E, P, V and T which is true for all substanes under all conditions is given by (∂E/∂V)
T
= T.(∂P/∂T)
H
- P . This equation is called the
Maxwell
Thermodynamic equation of state
Equation of state
Redlich-Kwong equation of state
0 h : 0 m : 1 s
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