Solved question paper for EME Dec-2014 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering Dec-2014
PTU • B-TECH • Mechanical Engineering • 1st-2nd • Dec-2014
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 is closed system?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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May 2015 What are open and closed systems?
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May 2008 What do you understand by closed system?
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What are path properties?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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Define internal energy?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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May 2020 Define internal energy.
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Dec 2020 Define Internal Energy.
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May 2017 Define internal energy.
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May 2016 Define internal energy.
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May 2008 Define internal energy.
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Write the steady flow energy equation for compressor?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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May 2023 Write down the general energy equations for steady flow system and simplify when applied to the following: a) Reciprocating air compressor
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Dec 2020 Write down the general energy equations for steady flow system and simplify when applied to the following: a) Reciprocating air compressor
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Define isobaric process?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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May 2017 What is adiabatic process?
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May 2008 What is isobaric process?
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Dec 2008 What is isothermal process?
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What is the c.o.p. for heat pump?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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May 2010 Give the relation between COP of heat pump and refrigerator.
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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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Draw the PV and TS diagram for Otto cycle?Short Answer 2 Marks Dec-2014 • 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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Dec 2016 Draw p-v and T-S diagram for the Otto cycle.
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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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What are inversions?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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What is stress?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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Define possion’s ratio?Very Short Answer 2 Marks Dec-2014 • PTU B-TECH
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May 2019 Explain Poission\'s ratio.
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State Kelvin-Planck and Clausius statements of second low of thermodynamics? Also show equivalence between them.Long Answer 5 Marks Dec-2014 • 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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May 2010 State Kelvin-Planck and Clausius statements of second law of thermodynamics. Explain the equivalence of Kelvin-Planck and Clausius statements.
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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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Derive the steady flow energy equation (SFEE) for Condenser.Long Answer 5 Marks Dec-2014 • PTU B-TECH
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May 2017 Write down the general steady flow energy equation (SFEE) and simplify it when applied to condenser.
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May 2017 Write down the general steady flow energy equation (SFEE) and simplify it when applied to evaporator.
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Dec 2014 Derive the steady flow energy equation (SFEE) for Evaporator.
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Derive the steady flow energy equation (SFEE) for Evaporator.Long Answer 5 Marks Dec-2014 • PTU B-TECH
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May 2017 Write down the general steady flow energy equation (SFEE) and simplify it when applied to condenser.
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May 2017 Write down the general steady flow energy equation (SFEE) and simplify it when applied to evaporator.
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Dec 2014 Derive the steady flow energy equation (SFEE) for Condenser.
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Steam at 8.5 bar and 2000 C is throttled to 3 bar and then expanded adiabatically to 0.5 bar. Find out the changes in entropy and enthalpy during these two processes.Long Answer 5 Marks Dec-2014 • PTU B-TECH
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What is thermodynamic system?Short Answer 5 Marks Dec-2014 • PTU B-TECH
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May 2020 Define a thermodynamics system.
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Dec 2020 Define a Thermodynamics System.
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May 2015 What is Thermodynamics?
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May 2008 Explain thermodynamic system.
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Discuss its types?Short Answer 5 Marks Dec-2014 • PTU B-TECH
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Write down the expression for air standard efficiency for a diesel engine?Short Answer 10 Marks Dec-2014 • 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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Dec 2016 Derive the expression for the ideal efficiency of Diesel cycle.
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May 2015 Derive the efficiency equation for Diesel cycle.
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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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A gas engine working on otto cycle has: Cylinder borer (diameter) = 220 mm; Stroke length = 300 mm, Clearance volume = 1600 cm3. Find the air standard efficiency (Take y =1.4).Long Answer 10 Marks Dec-2014 • PTU B-TECH
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May 2012 A gas engine working on Otto cycle has cylinder bore (diameter) = 220 mm; stroke length = 300 mm, clearance volume = 1600 cm3. Find the air standard efficiency. Take γ = 1.4.
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What is kinematic chain?Short Answer 10 Marks Dec-2014 • PTU B-TECH
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May 2017 What is kinematic chain?
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May 2017 State different types of basic kinematic chain.
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May 2013 Define link, kinematic chain with example.
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May 2012 What are kinematic links? How are they classified?
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May 2011 Define kinematic link, kinematic pair and kinematic chain.
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Dec 2010 What is kinematic link.
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Dec 2009 Define kinematic link, kinematic pair and kinematic chain.
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Dec 2007 Define link, kinematic chain with example.
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Explain it with the help of two examples?Short Answer 10 Marks Dec-2014 • PTU B-TECH
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What is mechanical advantage Explain the mechanism of worm and worm wheel?Long Answer 10 Marks Dec-2014 • PTU B-TECH
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Explain the stress starin diagram for ductile materials?Long Answer 10 Marks Dec-2014 • PTU B-TECH
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Dec 2020 Draw (only) and list stress strain diagram of ductile materials.
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May 2017 Draw and explain the stress-strain diagram for the ductile materials.
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A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the intensity of stress.Short Answer 10 Marks Dec-2014 • PTU B-TECH
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Dec 2014 A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the strain.
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Dec 2014 A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the elongation.
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A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the strain.Short Answer 10 Marks Dec-2014 • PTU B-TECH
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Dec 2014 A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the intensity of stress.
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Dec 2014 A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the elongation.
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A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the elongation.Short Answer 10 Marks Dec-2014 • PTU B-TECH
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Dec 2014 A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the intensity of stress.
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Dec 2014 A steel rod 25 mm diameter and 2m long is subjected to an axial pull of 45 KN. Find the strain.
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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.