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Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering

Learn Chemical Engineering Thermodynamics MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Chemical Engineering Thermodynamics MCQ question is the important chapter for a Chemical Engineering and GATE students. Page-9 section-3

Each section contains 100 MCQs on Chemical Engineering Thermodynamics .
81
A gas shows deviation from ideal behaviour at
Discuss
Answer & Solution
Answer: Option C
Solution:
A gas is close to ideal gas behavior at low pressure and high temperatures since at these conditions the gas satisfies the required conditions to be an ideal gas like the attractive forces between the molecules of gas becomes zero.
82
Fugacity and pressure are numerically not equal for the gases
Discuss
Answer & Solution
Answer: Option C
Solution:
The fugacity is also called as effective pressure in case of real gas ,and for ideal gas it numerically becomes equal to pressure so, for an gas to behave ideally we know the required conditions should be high temperature and low pressure and an standard state is usually selected where we know the value of fugacity so, it may or may not be equal to pressure.
83
__________ equation predicts the activity co-efficient from experimental data.
Discuss
Answer & Solution
Answer: Option D
Solution:
Both van-laar and margules equations are models to find out the activity co-efficient.
84
Pick out the correct statement.
Discuss
Answer & Solution
Answer: Option D
Solution:
The heat of formation is defined as amount of heat absorbed or evolved when I mol of a compound is formed from its elements in their standard states.
85
Entropy change of mixing two liquid substances depends upon the
Discuss
Answer & Solution
Answer: Option C
Solution:
Since entropy change of mixing is $${\left( {\Delta s} \right)_{mix}} = - nR\sum {} {x_i}\ln {x_i}$$
So, it is dependent on both number of moles and composition as we can see physically also that more and more number of moles we add to the system the system behavior changes and the properties changes.
86
Pick out the wrong statement.
Discuss
Answer & Solution
Answer: Option D
Solution:
The acentric factor can’t always be greater than 1. For many monoatomic fluids the acentric factor is close to zero.
87
Ideal gas law is applicable at
Discuss
Answer & Solution
Answer: Option D
Solution:
A gas is close to ideal gas behavior at low pressure and high temperatures since at these conditions the gas satisfies the required conditions to be an ideal gas like the attractive forces between the molecules of gas becomes zero etc.
88
Ideal refrigeration cycle is
Discuss
Answer & Solution
Answer: Option B
Solution:
Since ideal refrigeration cycle is just the reverse of ideal heat engine cycle (Carnot cycle), the ideal refrigeration cycle is same as reverse Carnot cycle.
89
Specific volume of an ideal gas is
Discuss
Answer & Solution
Answer: Option B
Solution:
The specific volume of any gas is inverse of density.
For an ideal gas, $$PV=nRT$$
$$ \Rightarrow P = \frac{{RT}}{{Mv}}$$    where $$v=$$ specific volume.
90
The necessary and sufficient condition for equilibrium between two phases is
Discuss
Answer & Solution
Answer: Option D
Solution:
The necessary and sufficient condition for a system containing different phases and different constituents to be in internal equilibrium is pressure and temperature of each and every phase should be same and chemical potential of constituent in a phase should be same in all the other phases.