Solved question paper for EME Dec-2016 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering Dec-2016
PTU • B-TECH • Mechanical Engineering • 1st-2nd • Dec-2016
elements of mechanical engineering previous year question papers on BRpaper are organized for students of Punjab Technical University’s Bachelor of Technology program, 1st-2nd semester. This section makes it easier to browse subject-wise old question papers for elements of mechanical engineering, so students can review how questions are typically framed in past exams and get a sense of the exam pattern. Many students search for elements of mechanical engineering question bank while preparing for exams, and this page is built to support exactly that kind of subject-wise browsing and revision. BRpaper is not the official website of Punjab Technical University or any institution, and it does not publish official notices or academic updates.
PART-A
1. Basic Concepts of Thermodynamics (08)
Definition of thermodynamic: Need to study thermodynamics; Application areas of thermodynamic; Difference between Microscopic (or, Statistical) thermodynamics and Macroscopic(or, Classical) thermodynamics; Brief concept of continuum; Thermodynamic System : definition, types (Open, Closed and Isolated) and their examples; Thermodynamic System Boundary : definition, types and their examples; Surroundings; Control(fixed) mass and Control Volume concept and their example ; Thermodynamic State; Thermodynamic Property: definition, types citing their examples; condition for any quantity to be a property; State postulate; Thermodynamic equilibrium (which includes Thermal, Mechanical and Chemical equilibrium etc.); Thermodynamic path; Thermodynamic process: definition, concept of reversible process, quasi-static (or, quasi-equilibrium) process, irreversible process, conditions for reversibility and how these are met with, non-flow processes and flow processes, method of representation of reversible and irreversible process on property diagrams; Cyclic process; Thermodynamic Cycle: definition and its concept; Energy and its forms (microscopic and macroscopic); Physical insight to internal energy; Energy transfer across system boundary i.e. transient energies (heat and work); Difference between heat and work; Sign conventions for heat and work interactions; heat and work as path functions; Equality of Temperature and Zeroth law of Thermodynamics.
2. First Law of Thermodynamics and its applications (12)
Definition, essence and corollaries or consequences of first law of Thermodynamics; Expressions for First law of Thermodynamics for a control mass undergoing a Cycle and for process (i.e., a change in state of a control mass) ; Concept of Enthalpy and total energy and differentiation between the two - a thermodynamic property; Compressible and incompressible substances, Specific heats, Difference between Internal Energy and Enthalpy of compressible and incompressible substances; Representation of first law of thermodynamics as rate equation; Analysis of non-flow/ flow process for a control mass undergoing constant volume, constant pressure, constant temperature, adiabatic and polytropic processes; Free Expansion Process and its examples, its representation on Property diagram; Review of concepts of control volume; Expressions of first law of thermodynamics for a control volume (i.e. open system) ; Steady State Steady Flow process and its examples; First law analysis of Steady State Flow process e.g. isochoric, isobaric, isothermal, isentropic and polytropic process; Throttling process and its applications; Flow energy or inertial energy of flowing fluids or, Energy transport by mass; Application of Steady State Flow Energy Equation to various engineering devices.
3. Second Law of Thermodynamics (16)
Limitations of first law of thermodynamics; and how 2nd law is fully able to explain away and thus overcome those shortcomings of Ist law; Thermal Reservoirs, source and sink (Low temperature and high temperatures); Heat Engine, Heat Pump and Refrigerator: definitions, working, efficiency/performance and their real life examples. Justification as to why the actual efficiency of Heat Pump and Refrigerator shall also be ≤ 100% though on the face of it seems to be more than 100%; Various statements of Second Law of Thermodynamics and their equivalence; Philosophy of Carnot cycle and its consequences viz. how each of the individual four processes constituting the cycle contribute in optimizing the output and efficiency of the cycle; Carnot Engine, Carnot Refrigerator and Carnot Heat Pump: definitions, working, efficiency/performance and Limitations of the cycle; Carnot theorem for heat engines, refrigerators and heat pumps; derivation of Carnot efficiency/COP (which seems to be more than 100%); Thermodynamic Temperature Scale; Clausius theorem and Inequality; Philosophy and concept of entropy; Entropy changes during various processes; Temperature - Entropy Chart and representation of various processes on it; Principle of Increase of Entropy; Applications of Entropy Principle; Quality of Energy viz. high and low grade energies; Degradation of Energy; Third Law of Thermodynamics.
PART-B
4. Gas Power Cycles (12)
Introduction; Concept and philosophy of Air Standard Cycle alongwith associated assumptions and advantages; Air Standard Efficiency; Nomenclature of reciprocating piston-cylinder arrangement with basic definitions such as swept volume, clearance volume, compression ratio, mean effective pressure etc; Otto Cycle (or constant volume heat addition cycle), Diesel cycle (or constant pressure heat addition cycle) and Dual cycle (Mixed or Composite or Limited Pressure cycle) with their representation on P-V and T-S charts, their Air-standard (thermal) Efficiencies; Brayton Cycle, Comparison of Otto, Diesel and Dual cycle under some defined similar parametric conditions; Introduction to heat engines; Merits of I.C. Engines and their important applications, Classification and constructional features of I.C. Engines; working of two stroke and four stroke Petrol and Diesel engines and their comparison.
5. Engineering Materials (05)
Materials and Civilization, Materials and Engineering, Classification of Engineering Materials, Mechanical Properties of Materials: elasticity, plasticity, strength, ductility, brittleness, melleability, toughness, resilience, hardness, machinability, formability, weldability. Properties, Composition, and Industrial Applications of materials: metals (ferrous- cast iron, tool steels, stainless steels and non ferrous- Aluminum, brass, bronze ), polymers (natural and synthetic , thermoplastic and thermosetting), ceramics (glass, optical fibre glass, cements), composites ( fibre reinforced, metal matrix), smart materials (piezoelectric, shape memory, thermochromic, photochromic, magnetorheological), Conductors, Semiconductors and insulators, Organic and Inorganic materials. Selection of materials for engineering applications.
6. Centroid, Centre of Gravity and Moment of Inertia: (08)
Difference between centre of gravity and centroid. Determination of position of centroid of plane geometric figures of I, U, H, L, T, C, Circular and Triangular Sections. Centroid of Composite Areas. Determination of position of Centre of Gravity (CG) of regular solids viz. Right Circular Cone, Solid Hemisphere, thin Hollow Hemisphere. Area moment of inertia & mass moment of inertia, Polar moment of inertia, Parallel axes Theorem (or transfer formula), Perpendicular axes Theorem, Radius of gyration, determination of area Moment of Inertia of I, U, H, L, T, C, Circular and Triangular Sections along various axes. Mass moment of Inertia of Circular Ring, Disc, Cylinder, Sphere and Cone about their axis of symmetry and other axes.
Solved Questions
Solved-
What do you understand by thermodynamic equilibrium?Short Answer 2 Marks Dec-2016 • PTU B-TECH
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Dec 2019 Define thermodynamic equilibrium.
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May 2018 What is meant by thermodynamic equilibrium? How does it differ from thermal equilibrium?
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May 2013 Explain the concept of thermodynamic equilibrium.
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May 2009 Discuss the concept of thermal equilibrium.
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Dec 2008 What is meant by thermodynamic equilibrium?
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What is first law of thermodynamics?Short Answer 2 Marks Dec-2016 • PTU B-TECH
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Dec 2023
Name and state the property introduced by the first law of thermodynamics.
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Dec 2023 What is the essence of first law of thermodynamics? Write down expression for the first law applied to
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May 2020 Explain briefly the zeroth law of thermodynamics.
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Dec 2020 Explain briefly zeroth law of thermodynamics.
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Dec 2020 Explain the first law of thermodynamics with respect to close systems.
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May 2016 Name and state the property introduced by the first law of thermodynamics.
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May 2015 Define and explain the Zeroth law of thermodynamics.
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May 2013 What is the essence of first law of thermodynamics? Write down expression for the first law applied to cycle.
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May 2013 What is the essence of first law of thermodynamics? Write down expression for the first law applied to process.
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Dec 2010 Define and explain the Zeroth law of thermodynamics. Why is it so called.
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Dec 2009 Define and explain Zeroth law of thermodynamics? Why it is so called?
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May 2008 What is zeroth law of thermodynamics?
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Distinguish between non-flow and flow processes.Short Answer 2 Marks Dec-2016 • PTU B-TECH
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State the Clausius statement of second law of thermodynamics.Short Answer 2 Marks Dec-2016 • PTU B-TECH
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May 2019 State Zeroth Law of Thermodynamics.
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Dec 2018 Define zeroth law of thermodynamics.
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May 2017 State and prove the Zeroth’s law of thermodynamics.
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Dec 2017 State the third law of thermodynamics.
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May 2016 Give the Kelvin-Plank statement of the second law.
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May 2015 State and explain the second law of thermodynamics.
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May 2015 State and prove the Zeroth’s law of thermodynamics.
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Dec 2008 Define third law of thermodynamics.
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Dec 2005 State the Zeroth law of Thermodynamics.
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What is Clausius inequality?Short Answer 2 Marks Dec-2016 • PTU B-TECH
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Dec 2023 b) State and prove Clausius inequality.
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May 2016 Explain the concept of Clausius Inequality.
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May 2012 State and prove Clausius inequality.
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Dec 2011 State and prove Clausius inequality.
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Draw p-v and T-S diagram for the Otto cycle.Short Answer 2 Marks Dec-2016 • PTU B-TECH
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May 2017 Explain the working principle of Otto cycle with the help of PV and TS diagrams.
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May 2015 Draw the PV and TS diagram of Otto cycle.
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May 2015 Draw the TS diagram for Otto cycle.
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Dec 2014 Draw the PV and TS diagram for Otto cycle?
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Define mechanical advantage and velocity ratio.Short Answer 2 Marks Dec-2016 • PTU B-TECH
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May 2009 Define velocity ratio, mechanical advantage and efficiency of a machine.
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Differentiate between mechanism and machines.Short Answer 2 Marks Dec-2016 • PTU B-TECH
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May 2015 Differentiate between machine and structure.
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May 2010 Differentiate between machine and mechanism.
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May 2009 Differentiate between mechanism and machine.
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May 2007 Differentiate between machine and mechanism.
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What is thermal stress?Short Answer 2 Marks Dec-2016 • PTU B-TECH
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May 2011 Define temperature stresses and strains.
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May 2010 Define temperature stresses and strains.
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Dec 2009 What are temperature stresses?
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What is meant by hardness of a material?Short Answer 2 Marks Dec-2016 • PTU B-TECH
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Dec 2023 Discuss the concept of \\\"hardness\\\" as a material property.
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A pump forces 1.5 m3/min of water horizontally from an open well to a closed tank where the pressure is 0.9 MPa. Calculate the work the pump must do upon the water in an hour just to force water into the tank against the pressure.Long Answer 8 Marks Dec-2016 • PTU B-TECH
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A gas turbine receives gases from the combustion chamber at 7 bar and 650ºC with a velocity of 90 m/s. The gases leave the turbine at 1 bar with a velocity of 45 m/s. Calculate the work done if the expansion is isentropic. Assume γ = 1.333 and Cp = 1.11 kJ/kg.Long Answer 8 Marks Dec-2016 • PTU B-TECH
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1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the heat added.Long Answer Dec-2016 • PTU B-TECH
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the work done.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the initial temperature of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the final pressure of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the heat added.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the gain in internal energy per kg.
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1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the work done.Long Answer Dec-2016 • PTU B-TECH
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the heat added.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the initial temperature of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the final pressure of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the heat added.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the gain in internal energy per kg.
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4 kg of air is compressed in a reversible steady flow polytropic process, pV1.25 = C, from 1 bar and 30ºC to 10 bar. Calculate the work input, heat transferred and change in entropy.Long Answer 8 Marks Dec-2016 • PTU B-TECH
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Derive the expression for the ideal efficiency of Diesel cycle.Long Answer 8 Marks Dec-2016 • PTU B-TECH
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Dec 2020 Derive the expression for the efficiency of the Diesel cycle.
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Dec 2016 What is air standard efficiency? Write its expression for diesel cycle.
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May 2015 Derive the efficiency equation for Diesel cycle.
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Dec 2014 Write down the expression for air standard efficiency for a diesel engine?
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May 2013 Derive an expression for the air standard efficiency and mean effective pressure of a Diesel cycle. State the assumptions made.
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May 2012 Derive an expression for efficiency and mean effective pressure for a Diesel cycle.
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Dec 2011 Derive an expression for mean effective pressure of diesel cycle.
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Dec 2007 What is air standard efficiency? Write its expression for diesel cycle.
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In a lifting machine, an effort of 30 N is required to raise a load of 1 kN. If the efficiency of the machine is 0.75, what is the velocity ratio?Long Answer 8 Marks Dec-2016 • PTU B-TECH
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Dec 2016 In a lifting machine, if an effort of 59 N raised a load of 2 kN, what is now the efficiency?
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In a lifting machine, if an effort of 59 N raised a load of 2 kN, what is now the efficiency?Long Answer 8 Marks Dec-2016 • PTU B-TECH
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Dec 2016 In a lifting machine, an effort of 30 N is required to raise a load of 1 kN. If the efficiency of the machine is 0.75, what is the velocity ratio?
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In a lifting machine, what will be the effort required to raise a load of 6 kN?Long Answer 8 Marks Dec-2016 • PTU B-TECH
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In a differential wheel and axle, the diameter of the larger axle is 250 mm and that of the smaller 225 mm. The diameter of effort wheel is 500 mm. Find the velocity ratio. If an effort of 150 N lifts a load of 3.5 kN, what is the efficiency and effort lost in friction?Long Answer 8 Marks Dec-2016 • PTU B-TECH
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Dec 2009 In a differential wheel and axel, the diameter of the larger axel is 250 mm and that of the smaller is 225 mm. The diameter of the effort wheel is 500 mm. Find the velocity ratio. If an effort of 150 N lifts a load of 3.5 kN, what is the efficiency and effort lost in friction?
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A steel bar of 25 mm diameter is loaded as shown in figure below. Calculate the stress in each portion and the total elongation. Take E = 200 GPa.Long Answer 8 Marks Dec-2016 • PTU B-TECH
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Answers about this subject, solved papers, and preparation.
01 Where can I find elements of mechanical engineering previous year question papers for Bachelor of Technology, 1st-2nd semester?
This page lists elements of mechanical engineering question papers uploaded for Punjab Technical University Bachelor of Technology, 1st-2nd semester, organized for subject-wise browsing where available.
02 Are these official Punjab Technical University question papers?
BRpaper is not the official website of Punjab Technical University. These papers are shared for reference and revision purposes only and are not official university material.
03 How can previous year elements of mechanical engineering papers help in exam preparation?
Reviewing past papers can help you understand how questions are typically framed, notice commonly repeated topics, and get a sense of the exam pattern before your own exam.
04 What kind of topics does elements of mechanical engineering usually cover?
The question papers here relate to the official elements of mechanical engineering syllabus set by the university for this course and semester.
05 Does this page include a elements of mechanical engineering question bank or solved answers?
This page focuses on providing access to the previous year question papers themselves. A separate question bank or solved answers may not be available for every paper.
06 Can I find papers for other subjects in the same Bachelor of Technology?
Yes, BRpaper organizes papers by university, course, stream, and semester, so you can browse other subjects within the same Punjab Technical University Bachelor of Technology.