Thermodynamics (KME-301) - AKTU Question Paper 2022-23
B.Tech · Semester 3 · Free PDF Download
This is the official AKTU Thermodynamics Previous Year Question Paper for B.Tech Semester 3, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 3
Session:2022-23
University:AKTU / UPTU
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Questions Asked in 2022-23
Thermodynamics (KME-301) — complete question paper
Section AAttempt all questions in brief. 2 x 10 = 20
- aWhat is the concept of continuum in thermodynamics?
- bExplain the state, path and cycl e for a thermodynamics process
- cDefine COP. Derive an expression between COP of refrigerator a nd heat pump
- dState the Clausius theorem
- eDistinguish between Helmholtz f unction and Gibb’s function
- fDefine coefficient of volume expansion
- gWhat do you understand by second law efficiency? How does it d iffer from first law efficiency?
- hWhat is meant by saturated states , sub cooled liquid and super heated vapour state? (i) Define Unit of Refrigeration. (j) Describe different types of refrigerants
Section BAttempt any three of the following: 10x3=30
- aWhat do you mean by an isolated system? Give the concept of tem perature and differentiate among heat, temperature and internal energy. A n insula te d rigid tank contains 0. 6 m3 of air at 12 bar and 150 0C. This air is allowed to expand to 1 bar. Find the maximum work that can be o btained from the escaping air in a adiabatic process. Take R= 0.277 kJ/kg-K and Cp= 1.005 kJ/kg-K for air
- bShow that the entropy change of 1 kg gas between state 1 and 2 is given as
- cDefine Joule- Thomson coefficien t. Also explain the significanc e of inversion curve
- d3 kg of steam at 18 bars occupies a volume of 0.225m 3. The steam expands at constant volume to a pressure of 10 bars. Determine final dryne ss fraction, final internal energy, change in entropy and work done
- eSketch and explain the actual va pour compression refrigeration cycle. Discuss the effect of evaporator and cond enser pressure on performance of vapour compression refrigeration cycle
Section CAttempt any one part of the following: 10x1=10
- aWhat is perpetual motion machin e of second type? A gas of mass 1.5 Kg undergoes
- aquasi static process expansion which follow relationship p = a + bV, where a and b are constants. The initial and final pressures are 100 kPa and 200 kPa respectively and the corresponding volumes are 0.20 m 3 and 1.20 m3. The specific internal energy of the gas is given by the relation. Where p is the KPa and v is in m 3/Kg. Calculate net heat transfer and the maximum internal energy of the gas attained during expansion
- bA gas undergoes a thermodynamic cycle consisting of three proc esses beginning at an initial state where p 1 = 1 bar, V1 = 1.5 m3 and U 1 = 512 kJ. The processes are as follows: (i) Process 1–2: Compression with pV = constant to p2 = 2 bar, U2 = 690 kJ (ii) Process 2–3: W23 = 0, Q23 = –150 kJ, and (iii) Process 3–1: W31 = +50 kJ. Neglecting KE and PE changes, determine the heat interactions Q12 and Q31
- aA heat engine is used to drive a heat pump. The heat transfers from the heat engine and from the heat pump are used to heat the water circulating through the radiators of
- abuilding. The efficiency of the heat engine is 27% and the CO P of the heat pump is
- 4Evaluate the ratio of the heat transfer to the circulating w ater to the heat transfer to the heat engine
- bEstimate the change of entropy of the universe due to each of t he following processes: (i) A copper block of mass 0.6 kg at 100 oC is placed in lake of water at 10oC. (ii) Two such blocks at 100oC and 10oC are joined together. Take Cp (for copper) = 0.393 kJ/ Kg-K
- aExplain Clausius- Clapeyron equation. Represent it on p-T diagram
- bA pressure vessel has a volume of 1 m 3 and contains air at 1.4 MPa, 175°C. The air is cooled to 25°C by heat transfer to the surroundings at 25°C. Calculate the availability in the initial and final states and the irreversib ility of this process. Take p0 = 100 kPa
- aA cyclic steam power plant is to be designed for a steam tempe rature at turbine inlet of 360oC and an exhaust pressure of 0.08bar. After isentropic expansio n of steam in the turbine, the moisture content at the turbine exhaust is not to exceed 15%. Determine the greatest allowable steam pressure at the turbine inlet, and calculate the Rankine efficiency
- bWith help of psychometric char t, explain the followings: (i) Heating and dehumidification processes (ii) Cooling and humidification processes (iii) Sensible heating (iv) Sensible cooling
- aExplain the working of a Reversed Carnot cycle of refrigeratio n with P-V and T- S Diagrams. What are the limitations of Carnot cycle of refrigeration?
- bIn a refrigeration plant worki ng on Bell Coleman cycle, air is compressed to 5 bar from 1 bar. Its initial temperature is 10 oC . A f t e r c o m p r e s s i o n , t h e a i r i s cooled up to 20o C in a cooler before expanding to a pressure of 1 bar. Determine the theoretical C.O.P of the plant and net refrigerating effect . Take Cp = 1.005 KJ/Kg K and Cv = 0718 KJ/Kg K
Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.
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