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Chemical Engineering
Chemical Engineering Thermodynamics
Quiz 4
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Q.1
On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will
Increase
Decrease
Remain same
Increase in summer and will decrease in winter
Q.2
The value of gas constant 'R' is
1.987 cal/gm mole °K
1.987 BTU/lb. mole °R
Both A and B
Neither A nor B
Q.3
With increase in pressure (above atmospheric pressure), the C
p
of a gas
Increases
Decreases
Remains unchanged
First decreases and then increases
Q.4
Work done in case of free expansion is
Indeterminate
Zero
Negative
None of these
Q.5
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which
A homogeneous solution (say of phenol water) is formed
Mutual solubility of the two liquids shows a decreasing trend
Two liquids are completely separated into two layers
None of these
Q.6
PV
γ
= Constant (where, γ = C
p
/C
v
) is valid for a/an __________ process.
Isothermal
Isentropic
Isobaric
Adiabatic
Q.7
In the reaction, represented by, 2SO₂ + O₂ ⇋ 2SO₃; ΔH = - 42 kcal; the forward reaction will be favoured by
Low temperature
High pressure
Both A and B
Neither A nor B
Q.8
Third law of thermodynamics is concerned with the
Value of absolute entropy
Energy transfer
Direction of energy transfer
None of these
Q.9
Second law of thermodynamics is concerned with the
Amount of energy transferred
Direction of energy transfer
Irreversible processes only
Non-cyclic processes only
Q.10
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
Increased COP
Same COP
Decreased COP
Increased or decreased COP ; depending upon the type of refrigerant
Q.11
The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature.
Critical
Boyle
Inversion
Reduced
Q.12
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂.Degree of dissociation of PCl5 will
Decrease on addition of Cl₂
Increase on addition of an inert gas at constant pressure
Decrease on increasing the pressure of the system
None of these
Q.13
A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
4
3
5
6
Q.14
In which of the following reaction equilibria, the value of equilibrium constant K
p
will be more than is K
c
?
2HI ⇋ H₂ + I₂
N₂O₄ ⇋ 2NO₂
2SO₂ + O₂ ⇋ 2SO₃
None of these
Q.15
As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches
Unity
Zero
That of the heat of reaction
Infinity
Q.16
Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.
Polar
Non-polar
Both A & B
Neither A nor B
Q.17
The heat capacities for the ideal gas state depend upon the
Pressure
Temperature
Both A & B
Neither A nor B
Q.18
One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is
30554
10373
4988.4
4364.9
Q.19
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be
Same
Doubled
Halved
One fourth of its original value
Q.20
Any substance above its critical temperature exists as
Saturated vapour
Solid
Gas
Liquid
Q.21
Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called __________ solutions.
Ideal
Real
Isotonic
None of these
Q.22
Internal energy change of a system over one complete cycle in a cyclic process is
Zero
+ve
-ve
Dependent on the path
Q.23
Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature.
Decreases
Increases
Remains constant
Decreases logarithmically
Q.24
Chemical potential is a/an
Extensive property
Intensive property
Force which drives the chemical system to equilibrium
Both B and C
Q.25
For a real gas, the chemical potential is given by
RT dlnP
RT dlnf
R dlnf
None of these
Q.26
The compressibility factor of a gas is given by (where, V₁ = actual volume of the gas V₂ = gas volume predicted by ideal gas law )
V₁/V₂
V₂/V₁
V₁-V₂
V₁.V₂
Q.27
Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = C
p
/C
v
= 7/5) and the process to be reversible, is
300(3
2/7
)
300(3
3/5
)
300(3
3/7
)
300(3
5/7
)
Q.28
As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches
Unity
Zero
Infinity
None of these
Q.29
Reduced pressure of a gas is the ratio of its
Pressure to critical pressure
Critical pressure to pressure
Pressure to pseudocritical pressure
Pseudocritical pressure to pressure
Q.30
An ideal liquid refrigerant should
Not have a subatmospheric vapour pressure at the temperature in the refrigerator coils
Not have unduly high vapour pressure at the condenser temperature
Both A and B
Have low specific heat
Q.31
Dry ice is
Moisture free ice
Solid helium
Solid carbon dioxide
None of these
Q.32
Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates
Use of only one graph for all gases
Covering of wide range
Easier plotting
More accurate plotting
Q.33
The activity of an ideal gas is numerically __________ its pressure.
More than
Less than
Equal to
Data insufficient, can't be predicted
Q.34
The temperature at the eutectic point of the system is the __________ temperature that can be attained in the system.
Lowest
Highest
Average
None of these
Q.35
Cv for an ideal gas
Does not depend upon temperature
Is independent of pressure only
Is independent of volume only
Is independent of both pressure and volume
Q.36
First law of thermodynamics is mathematically stated as
dQ = dE + dW
dQ = dE - dW
dE = dQ + dW
dW = dQ + dE
Q.37
A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is
349
651
667
1000
Q.38
For an ideal gas, the chemical potential is given by
RT dlnP
R dlnP
R dlnf
None of these
Q.39
Boiling of liquid is accompanied with increase in the
Vapor pressure
Specific Gibbs free energy
Specific entropy
All of the above
Q.40
Entropy of a substance remains constant during a/an __________ change.
Reversible isothermal
Irreversible isothermal
Reversible adiabatic
None of these
Q.41
Which of the following is a thermodynamic property of a system?
Concentration
Mass
Temperature
Entropy
Q.42
For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is
X
X + 1
X + 2
X + 3
Q.43
Isobaric process means a constant process.
Temperature
Pressure
Volume
Entropy
Q.44
Equilibrium constant of a reaction varies with the
Initial concentration of the reactant
Pressure
Temperature
None of these
Q.45
Which of the following will increase the volume of a real gas by four times ?
Doubling the absolute temperature as well as pressure of the gas
Reducing pressure to one fourth at constant temperature
Reducing temperature to one fourth at constant pressure
Reducing the temperature to half and doubling the pressure
Q.46
__________ decreases during adiabatic throttling of a perfect gas.
Entropy
Temperature
Enthalpy
Pressure
Q.47
C
v
is given by
(∂E/∂T)
V
(∂E/∂V)
T
(∂E/∂P)
V
(∂V/∂T)
P
Q.48
1m³ of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be
35 K
174 K
274 K
154 K
Q.49
When pressure is applied on the system, ice ⟷ water, then
Equilibrium can not be established
More ice will be formed
More water will be formed
Evaporation of water will take place
Q.50
Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
Isothermal
Adiabatic
Isentropic
None of these
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