About this previous year paper
This document is the B.Tech Semester–III Theory Examination 2019–20 question paper for Thermodynamics (Sub Code: KME301) under Dr. A.P.J. Abdul Kalam Technical University (AKTU).
The uploaded paper contains three pages, clearly divided into SECTION A, SECTION B, and SECTION C.
The exam duration is 3 hours, and the total marks are 100.
The paper evaluates a student’s understanding of thermodynamic laws, Carnot cycle, P–T diagrams, irreversibility, phase equilibrium, energy equations, Rankine cycle, steam turbines, Joule–Kelvin effect, Clapeyron equation, heat interactions, entropy, and gas/vapour processes.
SECTION A — Short Questions (10 × 2 = 20 Marks)
(Page 1 of the uploaded file)
Section A contains ten 2-mark questions, testing fundamental concepts of thermodynamics.
Topics include:
Critical point and triple point First law limitations
Carnot theorem Third law of thermodynamics
Difference between Helmholtz & Gibbs functions Meaning of 1 ton of refrigeration
Causes of irreversibility P–T diagram of a pure substance
Effect of evaporator pressure and superheating on C.O.P.
Definition of inversion curve
SECTION B — Long Descriptive Questions (Attempt Any 3 × 10 = 30 Marks)
(Page 1 bottom)
Students must choose any three of the long questions.
Topics include:
Steady flow energy equation (SFEE) for heat exchanger, nozzle, pump, turbine & boiler
P–V diagram based work/heat interactions
Application of First law to steady-flow systems
Steam properties, enthalpy relations
Basic thermodynamic processes & equations
Each question requires detailed derivation, explanation, or formulation.
SECTION C — Numerical & Advanced Questions (Q3–Q6)
(Pages 2 & 3)
Section C has four major questions (Q3, Q4, Q5, Q6).
Each contains two alternatives (a or b), and students must attempt one from each.
Q3 — Thermodynamic Cycle / Steady Flow Turbine
(Page 2)
(a) Three-process thermodynamic cycle with:
Compression Heat transfer Expansion
Given U₁, U₂, U₃ and W-values → Find Q₁₂ & Q₃₁.
(b) Steam turbine problem:
Inlet: 1.2 MPa, 188°C, enthalpy 2785 kJ/kg Exit: 20 kPa, enthalpy 2512 kJ/kg
Given velocities & mass flow → Find power output.
Q4 — Carnot Cycle / Entropy Change
(Page 2)
(a) Carnot cycle with steam heated from 350°C → saturation at 27°C.
Calculate heat supplied & cycle work.
(b) Entropy change of 1 kg water on heating.
Q5 — Clapeyron Equation / Heat Rejection
(Page 3)
(a) Explain Clapeyron equation + Joule–Kelvin effect with inversion curve.
(b) Reversible engine between 525 K and 875 K, heat rejection at 290 K — Find:
Total heat abstracted
Availability
Loss of available work
Q6 — Rankine Cycle / Psychrometric Concepts
(Page 3)
(a) Steam turbine working on Rankine cycle with dry saturated steam at 25 bar, exhaust at 0.2 bar → Determine:
Quality at end of expansion Turbine work
Pump work Rankine efficiency
Heat flow to condenser Mass flow = 10 kg/s
(b) Define & explain:
Dry bulb temperature Wet bulb temperature
Dew point temperature Relative humidity
Specific humidity These cover psychrometry and steam cycle concepts.
OVERALL SUMMARY OF THE DOCUMENT
The Thermodynamics (KME301) exam paper thoroughly evaluates:
Fundamental Concepts
First, second, and third laws Carnot theorem
Irreversibility, availability & work potential Thermodynamic properties: U, H, S, G, F
Applied Thermodynamics
P–T & P–V diagrams Pure substance behavior
Phase rule, inversion curves Clapeyron & Joule–Kelvin relations
Systems & Cycles
Steady-flow devices (turbine, pump, nozzle, boiler) Heat interactions and work transfer
Carnot and Rankine cycles Refrigeration performance (COP)
Numericals
Power output from turbine Heat interaction in cycles
Entropy change Psychrometric property calculations
The uploaded paper spans 3 pages, contains numerical problems, theoretical explanations, and cycle diagrams mentioned in text.