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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-1 section-2

Each section contains 100 MCQs on Chemical Engineering Thermodynamics .
1
Joule-Thomson effect i.e., a throttling process is a constant __________ process.
Discuss
Answer & Solution
Answer: Option D
Solution:
Joule – thomson throttling process is an iso-enthalpic process since pressure change is done at constant enthalpy that means a pressure change will occur but a corresponding internal energy change also occurs and enthalpy remains constant.
Since $$H = U + PV$$
2
Throttling (Joule-Thomson effect) process is a constant __________ process.
Discuss
Answer & Solution
Answer: Option A
Solution:
Joule – thomson throttling process is an iso-enthalpic process since pressure change is done at constant enthalpy that means a pressure change will occur but a corresponding internal energy change also occurs and enthalpy remains constant.
Since $$H = U + PV$$
3
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
Discuss
Answer & Solution
Answer: Option D
Solution:
Carnot refrigeration cycle has maximum COP since carnot is an ideal cycle consisting of reversiable changes at each and every step and hence no losses.
4
A nozzle is a device, which
Discuss
Answer & Solution
Answer: Option A
Solution:
Usually a nozzle is an converging duct so along the flow the area decreases so, by continuity we can say velocity increases when velocity increases (kinetic energy increases) we can say pressure decreases by bernoulli equation.
5
The first law of thermodynamics is a statement of conservation of
Discuss
Answer & Solution
Answer: Option C
Solution:
The first law of thermodynamics is an conservation of energy which states that energy cant be destroyed energy can be converted from one from to other but energy is not destroyed during the process and the energy of an isolated system always remans constant.
$$\delta Q = dU + \delta W$$
6
The total change in the enthalpy of a system is independent of the
Discuss
Answer & Solution
Answer: Option A
Solution:
The enthalpy is an state variable (point function) so, the change in enthalpy doesn’t depend upon the path involved to bring that change so we can say enthalpy change doesn’t depend upon whether the reaction carried through a path of single step or multiple steps.
7
All gases above its inversion temperature, in a throttling process will show
Discuss
Answer & Solution
Answer: Option A
Solution:
Above the inversion temperature joul thomson coefficient $$\left( \mu \right) = {\left( {\frac{{\partial T}}{{\partial P}}} \right)_H}{\text{ is }} - {\text{ve}}$$
So, on decreasing the pressure (throttling) the temperature increases.
8
Which of the following is an undesirable characteristics of a refrigerant ?
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
9
The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
Discuss
Answer & Solution
Answer: Option D
Solution:
The given statement is law of mass action which states that the rate of chemical reaction is directly proportional concentration of species involved in reaction.
Concentration involved in reaction $$=$$ active mass.
10
Linde gas liquefaction process employs cooling
Discuss
Answer & Solution
Answer: Option A
Solution:
Linde gas liquefication process is an throttling process where gas is kept below its inversion temperature so on decreasing the pressure (throttling) the temperature decreases and cooling occurs.