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Chemical Engineering Thermodynamics
Quiz 3
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Q.1
Which of the following is not correct for a reversible adiabatic process?
TV
γ-1
= constant
P
1-γ
.T
Y
= constant
PV
γ
= constant
None of these
Q.2
Requisites of a reversible process is that the
System and surroundings pressure be equal
Friction in the system should be absent
System and surroundings temperature be equal
None of these
Q.3
The internal energy of an ideal gas does not change in a reversible __________ process.
Isothermal
Adiabatic
Isobaric
Isometric
Q.4
In the equation PV
n
= constant, if the value of n = y = C
p
/C
v
, then it represents a reversible __________ process.
Isothermal
Adiabatic
Isentropic
Polytropic
Q.5
Pick out the wrong statement.
Activity co-efficient is dimensionless
In case of an ideal gas, the fagacity is equal to its pressure
In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component
The fugacity co-efficient is zero for an ideal gas
Q.6
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the
Two temperatures only
Pressure of working fluid
Mass of the working fluid
Mass and pressure both of the working fluid
Q.7
Pick out the correct statement.
Entropy and enthalpy are path functions
In a closed system, the energy can be exchanged with the surrounding, while. matter can not be exchanged
All the natural processes are reversible in nature
Work is a state function
Q.8
Pick out the wrong statement.
The values of (∂P/∂V)
T
and (∂²P/∂V²)
T
are zero for a real gas at its critical point
Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure, non-flow, mechanically reversible process
Thermal efficiency of a Carnot engine depends upon the properties of the working fluid besides the source & sink temperatures
During a reversible adiabatic process, the entropy of a substance remains constant
Q.9
Efficiency of a Carnot engine working between temperatures T₁ and T₂ (T₁ < T₂) is
(T₂ - T₁)/T₂
(T₂ - T₁)/T₁
(T₁ - T₂)/T₂
(T₁ - T₂)/T₁
Q.10
Co-efficient of performance for a reversed Carnot cycle working between temperatures T₁ and T₂ (T₁ > T₂) is
T₂/(T₁ - T₂)
T₁/(T₁ - T₂)
(T₁ - T₂)/T₁
(T₁ - T₂)/T₂
Q.11
Heat pump
Accomplishes only space heating in winter
Accomplishes only space cooling in summer
Accomplishes both A and B
Works on Carnot cycle
Q.12
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.
448
224
22.4
Data insufficient; can't be computed
Q.13
Which of the following liquid metals has the highest thermal conductivity?
Molten sodium
Molten lead
Mercury
Molten potassium
Q.14
The following heat engine produces power of 100000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is
100, 000 kW
160, 000 kW
200, 000 kW
320, 000 kW
Q.15
Degress of freedom at triple point will be
0
1
2
3
Q.16
Refrigeration cycle
Violates second law of thermodynamics
Involves transfer of heat from low temperature to high temperature
Both A and B
Neither A nor B
Q.17
Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as
P + F - C = 2
C = P - F + 2
F = C - P - 2
P = F - C - 2
Q.18
In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is
More
Less
Same
Unpredictable; depends on the particular reaction
Q.19
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:
Δ H = 0 and ΔS = 0
Δ H ≠ 0 and ΔS = 0
Δ H ≠ 0 and ΔS ≠ 0
Δ H = 0 and ΔS ≠ 0
Q.20
Compressibility factor of a gas is
Not a function of its pressure
Not a function of its nature
Not a function of its temperature
Unity, if it follows PV = nRT
Q.21
(∂E/∂T)
V
is the mathematical expression for
C
V
Enthalpy change
Free energy change
None of these
Q.22
(∂H/∂T)
p
is the mathematical expression for
C
V
Entropy change
Gibbs free energy
None of these
Q.23
A refrigerator may be termed as a
Heat pump
Heat engine
Carnot engine
None of these
Q.24
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
0.5
3.5
4.5
8.5
Q.25
The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is
3
1
2
0
Q.26
Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.
Infinity
Minus infinity
Zero
None of these
Q.27
In the equation, PV
n
= Constant, if the value of n = 0, then it represents a reversible __________ process.
Isobaric
Isothermal
Isentropic
Isometric
Q.28
(∂T/∂P)
H
is the mathematical expression for
Specific heat at constant pressure (C
p
)
Specific heat at constant volume (C
v
)
Joule-Thompson co-efficient
None of these
Q.29
A refrigeration cycle is the same as a __________ cycle,
Turbine
Heat engine
Reversed heat engine
None of these
Q.30
In the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂, decrease in the pressure of the system will __________ the degree of dissociation of PCl5.
Increase
Decrease
Not alter
None of these
Q.31
The four properties of a system viz. P, V, T, S are related by __________ equation.
Gibbs-Duhem
Gibbs-Helmholtz
Maxwell's
None of these
Q.32
Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?
Air cycle
Carnot cycle
Ordinary vapour compression cycle
Vapour compression with a reversible expansion engine
Q.33
Heat of reaction is
Dependent on pressure only
Dependent on temperature only
Dependent on both pressure and temperature
Independent of temperature changes
Q.34
Melting of ice exemplifies a/an
Adiabatic process
Endothermic reaction
Exothermic reaction
Process involving a chemical reaction
Q.35
Entropy change for an irreversible process taking system and surrounding together is
0
> 0
< 0
None of these
Q.36
Melting of wax is accompanied with __________ in entropy.
Increase
Decrease
No change
None of these
Q.37
Joule-Thomson co-efficient for a perfect gas is
Zero
Positive
Negative
None of these
Q.38
Which of the following is not affected by temperature changes?
Fugacity
Activity co-efficient
Free energy
None of these
Q.39
Forward reaction will be favoured for the exothermic reaction, represented by CO + H₂O ⇋ CO₂ + H₂, by
Low temperature and high pressure
Low temperature and low pressure
High temperature and high pressure
High temperature and low pressure
Q.40
The unit of equilibrium constant of a chemical reaction is the same as that of
Molar concentration
Temperature
Internal energy
None of these
Q.41
Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are
Always greater than one
Same at the same reduced temperature
Same at the same reduced pressure
Both B & C
Q.42
Refrigeration capacity of a household refrigerator may be round about __________ tons.
0.15
1.5
4.5
6.5
Q.43
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
CO₂
H₂
O₂
N₂
Q.44
Activity co-efficient is a measure of the
Departure from ideal solution behaviour
Departure of gas phase from idea] gas law
Vapour pressure of liquid
None of these
Q.45
The main feature of Carnot refrigeration cycle is that, it
Does not need the addition of external work for its functioning
Transfers heat from high temperature to low temperature
Accomplishes the reverse effect of the heat engine
None of these
Q.46
The principle applied in liquefaction of gases is
Adiabatic expansion
Joule-Thomson effect
Both A and B
Neither A nor B
Q.47
For a cyclic process, a fixed ratio between heat and work
Always exists
May exist
Never exists
Is difficult to predict
Q.48
During a reversible isothermal expansion of an ideal gas, the entropy change is
+ve
0
-ve
∞
Q.49
When a gas in a vessel expands, its internal energy decreases. The process involved is
Reversible
Irreversible
Isothermal
Adiabatic
Q.50
Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is
1
4
2
3
0 h : 0 m : 1 s
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