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-
Define property and mention its main characteristic in relation to a cyclic process.Short Answer 2 Marks May-2016 • PTU B-TECH
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Define specific heat. Why are there two specific heats for gases?Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2012 Why there are two values of specific heat for a gas?
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Dec 2009 Why gases have two specific heats?
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Name and state the property introduced by the first law of thermodynamics.Short Answer 2 Marks May-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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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 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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Show that the work done in a steady flow process is given by -∫vdp.Short Answer 2 Marks May-2016 • PTU B-TECH
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Explain the concept of Clausius Inequality.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2023 b) State and prove Clausius inequality.
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Dec 2016 What is 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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Comment on the statement, “The entropy of the universe tends to be maximum”.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2012 Comment on the statement: The entropy of the universe tends to be maximum.
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Define the terms available energy and unavailable energy.Short Answer 2 Marks May-2016 • PTU B-TECH
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May 2020 Explain the concept of available and unavailable energy.
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Dec 2020 Explain the concept of available and unavailable energy.
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How IC engines are classified?Short Answer 2 Marks May-2016 • PTU B-TECH
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May 2012 How are internal combustion engines classified?
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Dec 2012 What are the two basic types of internal combustion engines? What are the fundamental differences between the two?
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Dec 2011 How internal combustion engines can be classified on the basis of cylinder arrangement?
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Give the position of centroid of a triangle and semicircle.Short Answer 2 Marks May-2016 • PTU B-TECH
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Give composition and uses of high carbon steel and high speed steel.Short Answer 2 Marks May-2016 • PTU B-TECH
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May 2012 Discuss the composition, specific properties and main applications of Mild steel.
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May 2012 Discuss the composition, specific properties and main applications of High carbon steel.
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May 2012 Discuss the composition, specific properties and main applications of High speed steel.
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May 2012 Discuss the composition, specific properties and main applications of Stainless steel.
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Set up an expression for the displacement work done during any arbitrary process.Long Answer 3 Marks May-2016 • PTU B-TECH
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May 2016 Set up an expression for the displacement work done during any arbitrary process.
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May 2013 Set up an expression for the displacement work done during any arbitrary process.
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Dec 2012 Set up an expression for the displacement work done during an arbitrary process.
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Set up an expression for the displacement work done during any arbitrary process.Long Answer 3 Marks May-2016 • PTU B-TECH
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May 2016 Set up an expression for the displacement work done during any arbitrary process.
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May 2013 Set up an expression for the displacement work done during any arbitrary process.
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Dec 2012 Set up an expression for the displacement work done during an arbitrary process.
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Air initially at 75 kPa pressure, 1000 K temperature and occupying a volume of 0.12 m3 is compressed isothermally until the volume is halved and subsequently it undergoes further compression at constant pressure till the volume is halved again. Sketch the process on p-V diagram and make calculations for work done.Long Answer 5 Marks May-2016 • PTU B-TECH
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May 2009 Air initially at 61 kPa pressure, 800 K temperature and occupying a volume of 0.1 m3 is compressed isothermally till the volume is halved and further it goes through compression at constant pressure till the volume is halved again. Sketch the process on p-V diagram and make calculations for total work done and total heat interaction for the two processes. Assume ideal gas behaviour for air and take R = 1.005 kJ/kg K.
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Dec 2009 An air initially at 90 kPa pressure, 700 K temperature and occupying a volume of 0.5 m3 is compressed isothermally till the volume is halved and further it goes compression at constant pressure till the volume is halved again. Sketch the process on p-V diagram and make calculations for total work done and total heat interaction for the two processes. Assume ideal gas behaviour for air and take c_v = 1.004 kJ/kg K.
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A steady flow of water at enthalpy 250 kJ/kg enters a section of the heating plant of building in which there are no pumps. The water leaves the section at enthalpy 200 kJ/kg. The exit pipe is 25 m above the inlet pipe. Neglecting changes in kinetic energy, make calculations for the heat transfer from the water.Long Answer 8 Marks May-2016 • PTU B-TECH
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May 2013 A steady flow of water at enthalpy 250 kJ/kg enters a section of heating plant of a building in which there are no pumps. The water leaves the section at enthalpy 200 kJ/kg. The exit pipe is 25 m above the inlet pipe. Neglecting changes in kinetic energy, make calculations for the heat transfer from the water.
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Prove that the efficiency of an engine working on a reversible cycle depends only on the temperature of source and sink and is independent of the working fluid.Long Answer 4 Marks May-2016 • PTU B-TECH
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Dec 2016 Prove that the efficiency of an engine working on a reversible cycle depends only on the temperature of source and sink and is independent of the working fluid.
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A reversible heat engine receives heat from two thermal reservoirs at 870 K and 580 K, and rejects 50 kW of heat to a sink at 290 K. If the engine output is 85 kW, make calculations for the engine efficiency and heat supplied by each reservoir.Long Answer 4 Marks May-2016 • PTU B-TECH
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Show that whenever a system executes a complete cyclic process, ∮δQ/T is less than zero or in the limit is equal to zero. Hence prove that entropy is a property of the system.Long Answer 4 Marks May-2016 • PTU B-TECH
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A fluid transfers 2000 kJ of heat to the environment at 300 K. If the entropy change of the fluid is -5 kJ/K determine the overall entropy change and comment on the nature of the process whether possible, reversible, irreversible.Long Answer 4 Marks May-2016 • PTU B-TECH
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Derive an expression for efficiency and mean effective pressure for a Dual cycle.Long Answer 8 Marks May-2016 • PTU B-TECH
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May 2023 Derive the expression for the efficiency of the following cycles: b) Duel Cycle
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May 2023 Derive the expression for the efficiency of the following cycles: a) Diesel cycle
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Dec 2020 Derive the expression for the efficiency of the Duel Cycle.
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Dec 2007 Derive the expression for the air standard efficiency for dual cycle.
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A vertical cylinder with diameter 30 cm and height 40 cm is topped by a right circular cone of same diameter and height 20 cm. Find the C.G. of the composite body from the apex of the cone.Long Answer 8 Marks May-2016 • PTU B-TECH
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Differentiate between creep and fatigue.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2011 Differentiate between creep and fatigue?
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May 2009 Describe creep and fatigue.
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Dec 2007 Differentiate between creep and fatigue.
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Differentiate between yield stress and proof stress.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2023 a) Differentiate between the following: ii) Yield stress and proof stress
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Differentiate between ductile and brittle fracture.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2023 a) Differentiate between the following: iii) Ductile and brittle fracture
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What are the commercial alloys of aluminum? Briefly describe their composition and uses.Short Answer 2 Marks May-2016 • PTU B-TECH
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Dec 2023 b) What are the commercial alloys of aluminium? Briefly describe their composition and uses.
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A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the compression ratio.Short Answer May-2016 • PTU B-TECH
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May 2016 A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the pressure and temperature of the air after compression.
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May 2016 A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the thermal efficiency and power output if the air is heated to 1370°C.
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A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the pressure and temperature of the air after compression.Short Answer May-2016 • PTU B-TECH
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May 2016 A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the compression ratio.
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May 2016 A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the thermal efficiency and power output if the air is heated to 1370°C.
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A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the thermal efficiency and power output if the air is heated to 1370°C.Short Answer May-2016 • PTU B-TECH
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May 2016 A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the compression ratio.
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May 2016 A diesel engine operates on the air standard diesel cycle. The engine has six cylinders of 11 cm bore and 13 cm stroke. The engine runs at 2000 rpm. At the beginning of compression the air is at 1 bar and 26°C. If the clearance volume is 12.5 percent of the stroke volume, find the pressure and temperature of the air after compression.
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01 Where can I find elements of mechanical engineering previous year question papers for Bachelor of Technology, 1st-2nd semester?
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02 Are these official Punjab Technical University question papers?
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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?
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