Solved question paper for EME May-2010 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering May-2010
PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2010
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-
Define enthalpy of the system. How is it related to internal energy?Short Answer 2 Marks May-2010 • PTU B-TECH
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May 2011 What is the difference between total energy and enthalpy? Express both terms in detail.
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May 2011 What is the fundamental and basic difference between the terms enthalpy and total energy associated with the mass of a thermodynamic medium?
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May 2011 How enthalpy differs from the term heat transfer? Explain the difference between the two in detail.
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Dec 2005 How enthalpy is related to the internal energy?
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Define compression ratio.Short Answer 2 Marks May-2010 • PTU B-TECH
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Is it possible that W ≠ 0 even if dV = 0? If so, give an example.Short Answer 2 Marks May-2010 • PTU B-TECH
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What is entropy principle?Short Answer 2 Marks May-2010 • PTU B-TECH
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May 2018 What does the principle of increase of entropy specify?
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Draw P-V and T-S diagrams for Brayton cycle.Short Answer 2 Marks May-2010 • PTU B-TECH
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May 2013 Draw P-V and T-S plot for dual cycle.
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Dec 2005 Draw P-V and T-S diagram for an engine operated by Dual cycle.
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What is PMM1?Short Answer 2 Marks May-2010 • PTU B-TECH
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May 2020 What do you mean by PMM of first kind?
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Dec 2020 What do you mean by PMM of first kind?
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Dec 2020 What do you mean by PMM of the second kind?
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Give the relation between COP of heat pump and refrigerator.Short Answer 2 Marks May-2010 • PTU B-TECH
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Dec 2014 What is the c.o.p. for heat pump?
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Dec 2009 How COP of heat pump and refrigerator are related?
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May 2008 What is the concept of heat pump?
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Differentiate between machine and mechanism.Short Answer 2 Marks May-2010 • PTU B-TECH
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Dec 2016 Differentiate between mechanism and machines.
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May 2015 Differentiate between machine and structure.
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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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State the uses of Oldham coupling.Short Answer 2 Marks May-2010 • PTU B-TECH
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May 2016 Discuss the working of Oldham coupling.
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May 2008 What is the use of oldham\'s coupling?
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Dec 2007 Explain the working of Oldham coupling.
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Define temperature stresses and strains.Short Answer 2 Marks May-2010 • PTU B-TECH
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Dec 2016 What is thermal stress?
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May 2011 Define temperature stresses and strains.
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Dec 2009 What are temperature stresses?
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Differentiate between temperature, heat and internal energy.Short Answer May-2010 • PTU B-TECH
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May 2019 Distinguish between internal energy and enthalpy.
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May 2018 Differentiate between temperature, heat and internal energy.
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Dec 2016 Explain the difference between temperature, heat and internal energy.
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Dec 2014 Differentiate between temperature, heat and internal energy.
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Dec 2012 Differentiate between temperature, heat and internal energy.
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A non-flow reversible process occurs for which pressure and volume are correlated by the expression P = (V + 5/V), where P is in bar and V is in m3. What amount of work will be done when volume changes from 3 to 6 m3?Long Answer May-2010 • PTU B-TECH
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Dec 2005 A non flow reversible process occurs for which pressure and volume are correlated by the expression P=(V^2 + 6V), where P is in bar and V is m^3. What amount of work will be done when volume changes from 2 to 4 m^3?
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What is throttling process? Point out its salient aspects.Short Answer May-2010 • PTU B-TECH
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Dec 2019 What is throttling process?
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May 2013 What is the throttling process and give its salient features.
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May 2009 What do you understand by throttling process?
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The centrifugal pump delivers 50 kg of water per second. The inlet and outlet pressures are 1 bar and 4.2 bar respectively. The suction is 2.2 m below the centre of the pump and delivery is 8.5 m above the centre of the pump. The suction and delivery pipe diameters are 20 cm and 10 cm respectively. Determine the capacity of the electric motor to run the pump.Long Answer May-2010 • PTU B-TECH
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May 2018 A centrifugal pump delivers 50 kg of water per second. The inlet and outlet pressures are 1 bar and 4.2 bar respectively. The suction is 2.2 m below the centre of the pump and delivery is 8.5 m above the centre of the pump. The suction and delivery pipe diameters are 20 cm and 10 cm respectively. Find the capacity of electric motor to run the pump.
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May 2009 A centrifugal pump delivers 2750 kg of water per minute from initial pressure of 0.8 bar absolute to a final pressure of 3.8 bar absolute. The suction is 2 m below and delivery is 5 m above the centre of pump. If the suction and delivery pipes are of 15 cm and 10 cm diameter respectively, make calculations for power required to run the pump. Density of water: 1000 kg/m3.
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Draw P-V diagram for isobaric, isochoric and isothermal process.Short Answer May-2010 • PTU B-TECH
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May 2017 Draw the PV and TS diagrams for isobaric process.
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May 2017 Draw the PV diagram for isentropic process.
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Dec 2017 Define Isobaric process and draw its PV diagram.
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May 2015 Draw the PV and TS diagrams for isochoric process.
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May 2015 Draw the PV diagram for adiabatic process.
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0.2 m3 of an ideal gas at a pressure of 2 MPa and 600 K is expanded isothermally to 5 times the initial volume. It is then cooled to 300 K at constant volume and then compressed back polytropically to its initial state. Determine the net work done and heat transfer during the cycle.Long Answer May-2010 • PTU B-TECH
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May 2023 0.15m3 of an ideal gas at a pressure of 15 bar and 550K is expanded isothermally to 4 times the initial volume. It is then cooled at 290K at constant volume and then compressed back polytropically to its initial state. Calculate the net work done and heat transferred during the cycle.
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Dec 2020 0.15 m^3 of an ideal gas at a pressure of 15 bar and 550 K is expanded isothermally to 4 times the initial volume. It is then cooled at 290 K at constant volume and then compressed back polytropically to its initial state. Calculate the net work done and heat transferred during the cycle.
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May 2011 A 0.2 m^3 of ideal gas at a pressure of 20 bar and 600 K is expanded isothermally to 1 m^3. It is then cooled to 300 K at constant volume and then compressed back polytropically to its initial state. Find net work done and the net heat transfer during the cycle.
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Explain the working principle of dual cycle with the help of P-V and T-S diagrams. Derive an expression for the air standard efficiency of the dual cycle in terms of the compression ratio, pressure ratio, cut off ratio and the adiabatic index.Long Answer May-2010 • PTU B-TECH
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State Kelvin-Planck and Clausius statements of second law of thermodynamics. Explain the equivalence of Kelvin-Planck and Clausius statements.Long Answer May-2010 • PTU B-TECH
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Dec 2023 a) State Clausius and Kelvin-Planck statements of second law of thermodynamics and prove their equivalence.
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May 2017 State and explain the Kelvin Planck and Claussis statement of second law of thermodynamics.
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Dec 2017 State second law of thermodynamics. Prove the equivalence of Kelvin-Planck statement and Clausius statement of second law of thermodynamics.
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May 2015 State Kelvin-Planck and Claussius statements of second law of thermodynamics? Also show equivalence between them.
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Dec 2014 State Kelvin-Planck and Clausius statements of second low of thermodynamics? Also show equivalence between them.
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May 2009 Discuss equivalence of various statements of the second law of thermodynamics.
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Dec 2009 Write various statements of second law of thermodynamics and also show their equivalence.
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Explain the working of elliptical trammel.Short Answer May-2010 • PTU B-TECH
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May 2015 Describe with neat sketch the working of an Elliptical Trammel.
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May 2007 Explain the working of elliptical trammel.
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A machine raised a load of 300 N through a distance of 300 mm. The effort of 50 N moved 2.7 m during the process. Determine (i) Mechanical advantage. (ii) Velocity ratio. (iii) Efficiency. (iv) Effect of friction.Long Answer May-2010 • PTU B-TECH
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Derive the relation between Bulk modulus (K), Young's modulus (E) and Poisson's ratio (1/m).Long Answer May-2010 • PTU B-TECH
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Dec 2011 Establish a relation between Young’s modulus, modulus of rigidity and bulk modulus?
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In order to evaluate various mechanical properties, a steel specimen of 20 mm diameter and 20 cm length was tested in a standard tension test and data collected are: yield load = 150 kN; maximum load = 225 kN; fracture load = 175 kN; gauge length at fracture = 25 cm; extension at load of 30 kN = 0.08 mm. Determine (i) Yield point stress. (ii) Ultimate tensile stress. (iii) Percentage elongation. (iv) Modulus of elasticity. (v) Breaking strength.Long Answer May-2010 • PTU B-TECH
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Write short notes on reversible processes.Short Answer May-2010 • PTU B-TECH
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Write short notes on Carnot cycle.Short Answer May-2010 • PTU B-TECH
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Write short notes on creep.Short Answer May-2010 • PTU B-TECH
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Write short notes on working of four stroke diesel engine.Short Answer May-2010 • PTU B-TECH
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Dec 2010 Discuss briefly the working of a 4 stroke diesel engine.
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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.