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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-2 section-4

Each section contains 100 MCQs on Chemical Engineering Thermodynamics .
11
$$\frac{1}{{\text{V}}}{\left( {\frac{{\partial {\text{V}}}}{{\partial {\text{T}}}}} \right)_{\text{P}}}$$   is the mathematical expression
Discuss
Answer & Solution
Answer: Option C
Solution:
The fractional change in volume with change in temperature is called as coefficient of thermal expansion of a material with respect to volume.
12
Cp - Cv = R is valid for __________ gases.
Discuss
Answer & Solution
Answer: Option A
Solution:
$${C_P} - {C_V} = R,$$    is valid for ideal gas and we can prove this by using $$T-dS$$  equations.
13
The change in Gibbs freee energy for vaporisation of a pure substance is
Discuss
Answer & Solution
Answer: Option C
Solution:
Since, the gibbs free energy for vaporization of a pure substance is $$dG=VdP-SdT$$    since during phase change the temperature and pressure remains constant the gibbs free energy remains constant.
14
The chemical potential for a pure substance is __________ its partial molal free energy.
Discuss
Answer & Solution
Answer: Option C
Solution:
The chemical potential is nothing but the partial molar gibbs free energy.
$${\mu _i} = \left( {\frac{{\partial nG}}{{\partial {n_i}}}} \right)d{n_i}$$
15
For a given substance at a specified temperature, activity is __________ to fugacity.
Discuss
Answer & Solution
Answer: Option A
Solution:
For a given substance the activity is defined as ratio of fugacity at conditions of interest to fugacity at standard state, the standard state can be anything where the fugacity is known know, if you keep the standard state same and change the conditions of interest where you want to find out the fugacity then we can say that the activity becomes directly proportional to fugacity.
$$ \Rightarrow {a_i} = \frac{{{f_i}}}{{f_i^o}}$$
16
The unit of fugacity is the same as that of the
Discuss
Answer & Solution
Answer: Option A
Solution:
The fugacity is nothing but effective pressure and hence unit of fugacity is same as pressure.
17
Claussius-Clayperon equation gives accurate result, when the
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
18
Joule-Thomson experiment is
Discuss
Answer & Solution
Answer: Option D
Solution:
Joule -Thomson experiment is usually carried out at adiabatic conditions and the fluid enthalpy remains same during the process since during the process the internal energy and pressure energy will change in such a way that the enthalpy remains constant.
19
If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the
Discuss
Answer & Solution
Answer: Option D
Solution:
By first law of thermodynamics we can say $$\delta Q = dU + \delta W$$
$$ \Rightarrow $$  for the internal energy and work to be same in magnitude we can say that heat transfer has to be zero $$\delta Q = 0$$
So the process is adiabatic and given the system is ideal gas and its internal energy is decreasing so, we can say that temperature decreases since the internal energy of a substance is solely dependent of temperature.
20
The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.
Discuss
Answer & Solution
Answer: Option B
Solution:
The point at which all the three physical phases existing in equilibrium is nothing but triple point and here the degree of freedom becomes zero for a pure substance.