Solved question paper for EME May-2016 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering May-2016
PTU • B-TECH • Civil Engineering • 1st-2nd • May-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 is a quasi-static process?Short Answer 2 Marks May-2016 • PTU B-TECH
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May 2023 1(a) What is a quasi-static process?
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Dec 2020 What is a quasi-static process?
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May 2017 What is quasi-static and irreversible process?
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May 2009 What do you understand by quasi-static process? How is it achieved?
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Define internal energy.Short Answer 2 Marks May-2016 • 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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Dec 2014 Define internal energy?
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May 2008 Define internal energy.
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Give the representation of throttling process on P-V chart.Short Answer 2 Marks May-2016 • PTU B-TECH
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What is a cyclic heat engine?Short Answer 2 Marks May-2016 • PTU B-TECH
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Give the Kelvin-Plank statement of the second law.Short Answer 2 Marks May-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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Dec 2016 State the Clausius statement of second law of thermodynamics.
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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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Define the COP of a refrigerator.Short Answer 2 Marks May-2016 • PTU B-TECH
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What is an air standard cycle?Short Answer 2 Marks May-2016 • PTU B-TECH
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May 2014 What do you mean by air standard cycles? What are the assumptions for air standard cycles?
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May 2013 What is an air standard cycle? Why are such cycles conceived?
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May 2008 What do you mean by air standard cycles?
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State the four processes of the Otto cycle.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2018 Name the four processes that make up the ideal Diesel cycle.
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Differentiate between kinematic chain and mechanism.Short Answer 2 Marks May-2016 • PTU B-TECH
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Define the term resilience.Short Answer 2 Marks May-2016 • PTU B-TECH
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May 2007 Define resilience.
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Derive the expression for work done in a process in which pVn = constant.Long Answer 8 Marks May-2016 • PTU B-TECH
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A mass of gas is compressed without friction from a state of 0.3 m3 and 0.105 MPa to a final state of 0.15 m3 and 0.105 MPa. There is a transfer of 37.6 kJ of heat from the gas during the process. How much does the internal energy of the gas change?Long Answer 8 Marks May-2016 • PTU B-TECH
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Give the differential form of the steady flow energy equation.Short Answer 4 Marks May-2016 • PTU B-TECH
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Dec 2023 Derive steady flow energy equation for a single stream of fluid entering and leaving the control volume.
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May 2019 Derive steady flow energy equation for a single stream of fluid entering and leaving the control volume.
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Dec 2016 State the basic assumptions of steady flow energy equation.
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Dec 2009 Explain and derive steady flow energy equation.
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May 2007 State and write the steady flow energy equation.
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Show that the enthalpy of a fluid before throttling is equal to that after throttling.Short Answer 4 Marks May-2016 • PTU B-TECH
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May 2012 Show that enthalpy of a fluid before throttling is equal to after throttling.
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Three identical finite bodies of constant heat capacity are at temperature 300, 300, and 100 K. If no work or heat is supplied from outside, what is the highest temperature to which any one of the bodies can be raised by the operation of heat engines or refrigerators?Long Answer 8 Marks May-2016 • PTU B-TECH
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For the same compression ratio and heat rejection, which cycle is most efficient: Otto, Diesel or Dual? Explain with p-v and T-s diagrams.Long Answer 8 Marks May-2016 • PTU B-TECH
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May 2018 For the same compression ratio and heat input, which cycle is more efficient: Otto, Diesel or Dual? Explain with T - s diagram.
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Dec 2014 For the same compression ratio and heat input, which cycle is more efficient: Otto, Diesel, or Dual? Explain with T–s diagram.
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Discuss the working of Oldham coupling.Short Answer 4 Marks May-2016 • PTU B-TECH
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May 2010 State the uses 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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Discuss the reversibility of lifting machines.Short Answer 4 Marks May-2016 • PTU B-TECH
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May 2014 Explain the terms reversibility and irreversibility as applied to lifting machines.
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A concrete column, 250 mm × 250 mm in section, is reinforced by 8 longitudinal 15 mm diameter round steel bars. The column carries a compressive load of 300 kN. Make calculations for the loads carried by and compressive stresses produced in the steel bars and concrete. Take Es = 200 GN/m2, Ec = 15 GN/m2.Long Answer 8 Marks May-2016 • PTU B-TECH
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Write short notes on working of two stroke petrol engine.Short Answer 4 Marks May-2016 • PTU B-TECH
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Dec 2023 Explain the construction and working of four stroke petrol engine.
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Dec 2019 Explain the working of two stroke petrol engine giving neat sketch.
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Dec 2018 Explain the working of a two-stroke petrol engine with the help of neat sketches. What are the demerits of two-stroke engines?
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May 2013 Discuss briefly the working of a 4 Stroke Petrol engine.
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May 2012 Describe the working principle of a two stroke petrol engine with a neat diagram.
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Dec 2011 Explain the working of two stroke C.I. engine with the help of neat sketches.
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May 2007 Explain the working of two stroke IC engine with neat sketches.
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Dec 2007 Explain the working of four stroke IC engine with neat sketches.
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Write short notes on elliptical trammel.Short Answer 4 Marks May-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.