About this previous year paper
Section A — Short Answer Conceptual Questions
Section A consists of a set of concise, concept-based questions designed to test the student’s fundamental understanding of thermodynamics. Each question requires clear definitions, explanations, or basic reasoning.
This section focuses on:
Basic laws of thermodynamics
Fundamental definitions such as system, state, properties
Differences between thermodynamic concepts
Pure substance behavior
Work & heat interactions
Thermodynamic equilibrium
Limitations and applicability of thermodynamic processes
These questions measure the student’s grasp of essential theoretical knowledge that forms the foundation for solving advanced thermodynamic problems.
(Page 1)
Section B — Analytical & Numerical Problem-Solving
Section B includes detailed numerical and analytical questions that require step-by-step application of thermodynamic laws.
One of the major numerical problems involves air compression, where air at:
100 kPa and 280 K
is compressed steadily to:
600 kPa and 400 K
with a mass flow rate of 0.02 kg/s and heat loss of 16 kJ/kg.
Students must compute the power input required to the compressor using the steady-flow energy equation, assuming negligible kinetic and potential energy changes.
This section tests:
Energy balance in open systems
Work and heat interaction calculations
Application of the First Law for steady-flow systems
Understanding of compressor processes in real-world engineering
(Page 2)
Section C — Long Answer Questions (Thermodynamic Cycles & Advanced Applications)
Section C focuses on larger thermodynamic systems and cycle analysis. The key problem describes two Carnot engines working in series between high and low temperature reservoirs (550 K and 350 K). Students must determine the intermediate temperature when both engines deliver equal power.
This question evaluates understanding of:
Carnot cycle efficiency
Temperature ratios
Reversible heat engine analysis
Ideal cycle performance
Other questions in this section may cover theoretical explanations, process analysis, entropy, and cycle efficiencies.