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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-10 section-3

Each section contains 100 MCQs on Chemical Engineering Thermodynamics .
91
In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v2 = 3 m3) is maximum, when the value of 'n' is
Discuss
Answer & Solution
Answer: Option A
Solution:
The work done for a process described by equation $$P{V^n} = {\text{constant}}{\text{.}}$$
Is given by $$w = \frac{{CV_2^{1 - n} - CV_1^{1 - n}}}{{1 - n}}$$
So, the work obtained will be maximum when n is minimum so, $$n = 0.$$
92
In an adiabatic process, the
Discuss
Answer & Solution
Answer: Option A
Solution:
If a system is undergoing adiabatic process that means it is not interacting with surroundings in terms of heat. Generally, it is achieved by insulating the system walls.
93
Which of the following is not an extensive property?
Discuss
Answer & Solution
Answer: Option C
Solution:
An extensive property is one which depends upon extent (mass) of the system. Since refractive index is not dependent on the amount it is not an extensive property.
94
In an irreversible process
Discuss
Answer & Solution
Answer: Option C
Solution:
From second law of thermodynamics :
$$\eqalign{ & TdS \geqslant \delta Q \cr & \Rightarrow TdS \geqslant dU + \delta W \cr} $$
For an irreversible process $$TdS - dU - \delta W > 0$$
And for an reversible process $$TdS - dU - \delta W = 0$$
95
In any spontaneous process,
Discuss
Answer & Solution
Answer: Option C
Solution:
For any spontaneous process there should be finite changes so, we can consider it as an irreversible process and we know for irreversible process from second law of thermodynamics $$TdS - dU - PdV > 0$$
Under constant temperature and volume process $$ - dF > 0 \Rightarrow dF < 0$$
Similarly for an constant temperature and pressure process
$$\eqalign{ & d\left( {TS - U - PV} \right) > 0 \cr & \Rightarrow dG = 0 \cr} $$
96
The enthalpy change when ammonia gas is dissolved in water is called the heat of
Discuss
Answer & Solution
Answer: Option A
Solution:
The enthalpy changes of solution is called the amount of heat evolved or taken by th system to form the solution.
97
During adiabatic expansion of gas
Discuss
Answer & Solution
Answer: Option D
Solution:
During adiabatic process the interactions of system with surroundings becomes zero. So, the internal energy of the system is used for doing the expansion work.
98
Compound having large heat of formation is
Discuss
Answer & Solution
Answer: Option A
Solution:
Compound having high heat of formation indicates a higher amount of energy is released during the formation of compound so the compound formed will have lower energy hence it will be more stable.
99
The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in
Discuss
Answer & Solution
Answer: Option D
Solution:
The given equation is a fundamental property relation and is valid for every open system with constant composition and for a closed system when no reaction is taking place in the system.
100
Pick out the correct statement.
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board