THEORY EXAMINATION (SEM–IV) 2016-17 CHEMICAL ENGINEERING THERMODYNAMICS-I

Subject: Chemical Engineering Thermodynamics – I (CH402)

Time: 3 Hours
Maximum Marks: 100

Section A – Short Questions (10 × 2 = 20 Marks)

This section focuses on definitions, basic principles, and conceptual understanding.
Topics include:

Second law of thermodynamics                   Volume expansivity

Heat engine concept                                    Limitations of the first law of thermodynamics

Expression for gas expansion                       COP (Coefficient of Performance)

Joule–Thomson Coefficient                          Third Law of Thermodynamics

Thermodynamic property                            Closed system (with examples)

Section B – Descriptive / Problem-Based Questions (5 × 10 = 50 Marks)

Longer conceptual and numerical questions covering applied thermodynamics.
Key problems include:

Adiabatic compression of CO₂ — find Q, ΔU, and W for each step

Explanation of the critical point and P–V diagram

Derivation showing fugacity for a real gas obeying p(v−B)=RTp(v-B) = RTp(v−B)=RT

Derivation of the fundamental property relation and four Maxwell’s relations

Calculation of least rate of heat rejection for a heat engine between two reservoirs

Relation for entropy change during adiabatic mixing

Problem on entropy change when a hot steel casting is quenched in oil

Problem involving reversible expansion of a perfect gas with entropy change calculations

Section C – Long Analytical / Derivation Questions (2 × 15 = 30 Marks)

Conceptually deeper questions requiring derivations or detailed reasoning.
Questions include:

Turbine Problem – Calculate power output using given steam flow conditions (enthalpy, velocity, elevation, and heat loss data).

P–V Diagram Explanation – Discuss and derive work for isothermal and adiabatic processes.

Gibbs–Duhem Equation – Explain what it relates and derive its various forms.

Major Topics Covered

Laws of Thermodynamics

Energy equations for steady-flow systems

Entropy, fugacity, and equilibrium relations

Isothermal & adiabatic work

Maxwell’s relations

Gibbs–Duhem equation

Heat engines and efficiency concepts

Thermodynamic property relations