Solved question paper for EME Dec-2010 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering Dec-2010
PTU • B-TECH • Civil Engineering • 1st-2nd • Dec-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-
How is the property of system classified?Short Answer 2 Marks Dec-2010 • PTU B-TECH
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May 2007 How is the property of system classified? Explain with example.
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What do we understand by energy in Transit?Short Answer 2 Marks Dec-2010 • PTU B-TECH
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Differentiate between the adiabatic and polytropic process.Short Answer 2 Marks Dec-2010 • PTU B-TECH
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Why C_p is greater than C_v?Short Answer 2 Marks Dec-2010 • PTU B-TECH
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What are the assumptions for steady flow process?Short Answer 2 Marks Dec-2010 • PTU B-TECH
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Dec 2023
What is a steady flow process?
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May 2013 What is a steady flow process?
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Sketch the Carnot cycle on p-V and T:S diagram.Long Answer 2 Marks Dec-2010 • PTU B-TECH
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Define the mean effective pressure for Reciprocating engine.Short Answer 2 Marks Dec-2010 • PTU B-TECH
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State the law of lifting of machine.Short Answer 2 Marks Dec-2010 • PTU B-TECH
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Dec 2007 State the law of lifting machine.
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What is kinematic link.Short Answer 2 Marks Dec-2010 • 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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Dec 2014 What is 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 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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Sketch a Stress-Strain for ductile and brittle materials and show the salient point on it.Long Answer 2 Marks Dec-2010 • PTU B-TECH
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May 2015 Draw and explain the stress-strain diagram for mild steel? Also describe how it is different from brittle materials.
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May 2011 Sketch stress-strain curves for ductile and brittle materials and show the salient points on it.
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May 2007 Draw stress strain curve for a typical brittle material.
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Dec 2005 Draw a stress-strain curve for a mild steel specimen.
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Define and explain the Zeroth law of thermodynamics. Why is it so called.Long Answer Dec-2010 • 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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Dec 2016 What is 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 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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A non flow reversible process occurs for which pressure and volume are correlated by the expression PV=150, where V is the volume in m3 and p is the pressure in bar. Make calculations for the work done on or by the system as pressure increases from 10 bar to 100 bar. Indicate the nature of process, whether expansion or compression.Long Answer Dec-2010 • PTU B-TECH
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Dec 2018 A non-flow reversible process occurs for which pressure and volume are correlated by the expression pV = 150, where V is the volume in m3 and p is the pressure in bar. Calculate the work done on or by the system as pressure increases from 10 bar to 100 bar. Indicate the nature of process, whether expansion or compression.
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How are the state parameters P, V and T related in a polytropic process? What are the values of polytropic exponent for isochoric, isothermal and adiabatic process.Long Answer Dec-2010 • PTU B-TECH
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Show that the internal energy is a property of the system.Long Answer Dec-2010 • PTU B-TECH
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The gas leaving the turbine jet engine flows steadily into the jet pipe with enthalpy 960 kJ/kg and velocity 250 m/s relative to the pipe. The exit from the pipe is at enthalpy 1000 kJ/kg, and the exhaust is in line with intake. Neglecting heat loss from the system, determine the relative velocity of gas leaving the pipe.Long Answer Dec-2010 • PTU B-TECH
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Explain the establishment of thermodynamic temperature scale. Why is thermodynamic temperature scale called the absolute temperature scale.Long Answer Dec-2010 • PTU B-TECH
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Derive an expression for the air standard efficiency and mean effective pressure of an Otto cycle. State the assumptions made.Long Answer Dec-2010 • PTU B-TECH
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Dec 2023 Draw Otto cycle and derive its air standard efficiency and mean effective pressure.
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Dec 2018 Derive an expression for the air standard thermal efficiency of Otto cycle.
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May 2017 Derive the expression for air standard efficiency for Otto cycle. Also draw its PV and T-S diagram.
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Dec 2016 Derive an expression for efficiency and mean effective pressure of Otto cycle.
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May 2007 Derive the expression for the air standard efficiency for otto cycle.
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Discuss briefly the working of a 4 stroke diesel engine.Long Answer Dec-2010 • PTU B-TECH
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May 2010 Write short notes on working of four stroke diesel engine.
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Make a labelled sketch of Oldham coupling?Long Answer Dec-2010 • PTU B-TECH
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May 2013 Make a labelled sketch of Oldham Coupling.
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May 2011 Make a labeled sketch of the Oldham coupling and list its uses.
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Discuss the various inversion of double slider crank chain mechanism.Long Answer Dec-2010 • PTU B-TECH
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May 2018 Sketch and briefly explain any two inversions of a double slider crank chain.
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May 2011 Discuss various inversions of double slider crank chain mechanism.
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An unknown weight falls 4 cm on to a collar rigidly attached to the lower end of a vertical bar 4 m long and 8 cm2 in section. If the maximum instantaneous extension is found to be 0.42 cm. Find the corresponding stress and the value of unknown weight E = 200 kN/mm2.Long Answer Dec-2010 • PTU B-TECH
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May 2014 A weight W falls through 1 cm on a collar attached at the bottom of a vertical bar. The maximum instantaneous extension in the bar is 0.002 mm for a length of 3 m. The area of cross-section of the bar is 6 cm^2. Find the corresponding stress and the weight W. Take E = 200 GPa.
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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.