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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-5 section-5

Each section contains 100 MCQs on Chemical Engineering Thermodynamics .
41
With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
42
In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.
Discuss
Answer & Solution
Answer: Option B
Solution:
In an isothermal process as we $$PV = {\text{constant}}$$
$$ \Rightarrow $$ on applying $$\log $$ we get $$\log P + \log V = \operatorname{log\,Constant} $$      on differentiating we get $$\frac{{dP}}{P} + \frac{{dV}}{V} = 0,$$
So, $$\frac{{dV}}{V} * 100 = - \frac{{dp}}{p} * 100$$     given the pressure has a percentage increase of $$0.5$$
So, the volume will have a percentage decrease of $$0.5.$$
43
The temperature at which both liquid and gas phases are identical, is called the __________ point.
Discuss
Answer & Solution
Answer: Option A
Solution:
The critical point is a point where the difference in properties between the vapour and liquid will no longer exists and so, we can’t identify which is liquid and which is vapour.
44
The variation of heat of reaction with temperature at constant pressure is given by the __________ law.
Discuss
Answer & Solution
Answer: Option C
Solution:
Kirchhoff law gives the variation of heat of reaction with temperature at constant pressure.
45
For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.
Discuss
Answer & Solution
Answer: Option B
Solution:
We know for an ideal binary solution by Lewis-Randall rule fugacity of a component is directly proportional to mole fraction of that component. So basically on increasing the mole fraction the fugacity of the component is increasing but this equation is valid only for an ideal solution but, we can extend this behavior for real solution also under some conditions.
46
Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.
Discuss
Answer & Solution
Answer: Option C
Solution:
We know for an ideal binary solution by Lewis-Randall rule fugacity of a component is directly proportional to mole fraction of that component. So basically on increasing the mole fraction the fugacity of the component is increasing but this equation is valid only for an ideal solution but, we can extend this behavior for real solution also under some conditions.
47
When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the
Discuss
Answer & Solution
Answer: Option D
Solution:
The given is the phenomena that takes place during Joule Thomson (cooling or heating) effect.
48
Fugacity co-efficient of a substance is the ratio of its fugacity to
Discuss
Answer & Solution
Answer: Option C
Solution:
Fugacity coefficient s nothing but ratio of fugacity of the gas at some particular conditions to the fugacity of the gas when it is behaved as an ideal gas at the same conditions (nothing but pressure as for an ideal gas fugacity $$=$$ pressure).
49
Out of the following refrigeration cycles, which one has maximum COP?
Discuss
Answer & Solution
Answer: Option B
Solution:
Carnot cycle is an theoretical cycle designed to use as an reference cycle it will have maximum COP since all the steps involved during the cycle are reversible so, no losses are involved.
50
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be
Discuss
Answer & Solution
Answer: Option A
Solution:
The Otto engine has more efficiency than diesel engine. As the ratio of area under p-v diagram to heat addition in case of petrol engine is more than the diesel engine. But for the practical purposes the diesel engine has more efficiency.