Solved question paper for EME May-2008 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering May-2008
PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2008
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-
Explain thermodynamic system.Short Answer 2 Marks May-2008 • 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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Dec 2014 What is thermodynamic system?
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What is zeroth law of thermodynamics?Short Answer 2 Marks May-2008 • 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 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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Define internal energy.Short Answer 2 Marks May-2008 • 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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Dec 2014 Define internal energy?
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What do you understand by closed system?Short Answer 2 Marks May-2008 • PTU B-TECH
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May 2015 What are open and closed systems?
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Dec 2014 What is closed system?
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What is isobaric process?Short Answer 2 Marks May-2008 • PTU B-TECH
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May 2017 What is adiabatic process?
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Dec 2014 Define isobaric process?
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Dec 2008 What is isothermal process?
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What is the concept of heat pump?Short Answer 2 Marks May-2008 • PTU B-TECH
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Dec 2014 What is the c.o.p. for heat pump?
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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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What do you mean by air standard cycles?Short Answer 2 Marks May-2008 • PTU B-TECH
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May 2016 What is an air standard cycle?
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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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Define mean effective pressure.Short Answer 2 Marks May-2008 • PTU B-TECH
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What is the elastic limit?Short Answer 2 Marks May-2008 • PTU B-TECH
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What is the use of oldham's coupling?Short Answer 2 Marks May-2008 • PTU B-TECH
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May 2016 Discuss the working of Oldham coupling.
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May 2010 State the uses of Oldham coupling.
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Dec 2007 Explain the working of Oldham coupling.
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Differentiate between reversible and irreversible processes.Long Answer 8 Marks May-2008 • PTU B-TECH
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Dec 2017 Differentiate between thermodynamic state and process.
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Define enthalpy, why does the enthalpy of an ideal gas depend only on temperature? Discuss.Long Answer 8 Marks May-2008 • PTU B-TECH
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Dec 2016 Why does the enthalpy of an ideal gas depend upon temperature only?
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1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the initial temperature of air.Short Answer 2 Marks May-2008 • PTU B-TECH
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the heat added.
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the work done.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the final pressure of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the heat added.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the gain in internal energy per kg.
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1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the final pressure of air.Short Answer 2 Marks May-2008 • PTU B-TECH
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the heat added.
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the work done.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the initial temperature of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the heat added.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the gain in internal energy per kg.
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1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the heat added.Short Answer 2 Marks May-2008 • PTU B-TECH
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the heat added.
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the work done.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the initial temperature of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the final pressure of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the gain in internal energy per kg.
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1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the gain in internal energy per kg.Short Answer 2 Marks May-2008 • PTU B-TECH
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the heat added.
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Dec 2016 1 kg of air having an initial volume of 0.3 m3 is heated at constant pressure of 3.2 bar until the volume is doubled. Find the work done.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the initial temperature of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the final pressure of air.
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May 2008 1 kg of air at 3.5 bar and occupying 0.35 m3 is heated at constant volume until its temperature has risen to 316°C. Find the heat added.
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What is Carnot cycle? What are the four processes which constitute the cycle? Explain.Long Answer 8 Marks May-2008 • PTU B-TECH
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An air standard Otto cycle operates with a compression ratio of 8.5:1. At the beginning of the compression the air is at 1 bar and 32°C and during the heat addition process the pressure is tripled. Calculate the thermal efficiency of the cycle.Short Answer 4 Marks May-2008 • PTU B-TECH
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the compression ratio.
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the maximum temperature in the cycle.
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the work ratio.
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the thermal efficiency.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the heat supplied per kg of air.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the work done per kg of air.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the maximum pressure of the cycle.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the thermal efficiency.
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May 2017 An engine working on otto cycle has the following conditions: Pressure at the beginning of compression = 1 × 10^5 N/m^2, Pressure at the end of compression = 10 bar. Calculate the air standard efficiency of the engine, take γ = 1.4.
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Dec 2017 An engine is working on OTTO cycle. The pressure and temperature at the beginning of compression stroke are 1 bar and 300 K and the temperature at the end of compression stroke is 600 K. If the temperature at the end of constant volume heat addition process is 1800 K, calculate the air standard efficiency, heat addition per kg of air and heat rejected per kg of air. Assume γ = 1.4, Cv = 0.751 J/kg K.
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May 2015 An engine working on Otto cycle has the following conditions: Pressure at the beginning of compression = 1 × 105 N/m2. Pressure at the end of compression = 10 bar. Calculate the air standard efficiency of the engine. Take y = 1.4.
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May 2015 An engine working on Otto cycle has the following conditions: Pressure at the beginning of compression =1 × 10^5 N/m^2 Pressure at the end of compression = 10 bar. Calculate the air standard efficiency of the engine, Take y = 1.4
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Dec 2014 In an air standard Otto cycle, the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate: (a) the compression ratio, (b) the maximum temperature in the cycle, (c) work ratio, (d) thermal efficiency.
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May 2008 An air standard Otto cycle operates with a compression ratio of 8.5:1. At the beginning of the compression the air is at 1 bar and 32°C and during the heat addition process the pressure is tripled. Calculate the efficiency of the Carnot engine operating between the same overall temperature limits.
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Dec 2008 An air standard Otto cycle has compression ratio 10, the compression begins at 37.8°C, 1 bar and maximum temperature of the cycle is 1050°C. Determine: (a) the heat supplied per kg of air, (b) the work done per kg of air, (c) the maximum pressure of the cycle, and (d) the thermal efficiency.
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An air standard Otto cycle operates with a compression ratio of 8.5:1. At the beginning of the compression the air is at 1 bar and 32°C and during the heat addition process the pressure is tripled. Calculate the efficiency of the Carnot engine operating between the same overall temperature limits.Short Answer 4 Marks May-2008 • PTU B-TECH
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the compression ratio.
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the maximum temperature in the cycle.
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the work ratio.
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May 2018 In an air standard Otto cycle the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate the thermal efficiency.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the heat supplied per kg of air.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the work done per kg of air.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the maximum pressure of the cycle.
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May 2018 In an air standard Otto cycle the compression ratio is 10, the compression begins at 38°C, 1 bar, and the maximum temperature of the cycle is 1060°C. Determine the thermal efficiency.
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May 2017 An engine working on otto cycle has the following conditions: Pressure at the beginning of compression = 1 × 10^5 N/m^2, Pressure at the end of compression = 10 bar. Calculate the air standard efficiency of the engine, take γ = 1.4.
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Dec 2017 An engine is working on OTTO cycle. The pressure and temperature at the beginning of compression stroke are 1 bar and 300 K and the temperature at the end of compression stroke is 600 K. If the temperature at the end of constant volume heat addition process is 1800 K, calculate the air standard efficiency, heat addition per kg of air and heat rejected per kg of air. Assume γ = 1.4, Cv = 0.751 J/kg K.
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May 2015 An engine working on Otto cycle has the following conditions: Pressure at the beginning of compression = 1 × 105 N/m2. Pressure at the end of compression = 10 bar. Calculate the air standard efficiency of the engine. Take y = 1.4.
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May 2015 An engine working on Otto cycle has the following conditions: Pressure at the beginning of compression =1 × 10^5 N/m^2 Pressure at the end of compression = 10 bar. Calculate the air standard efficiency of the engine, Take y = 1.4
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Dec 2014 In an air standard Otto cycle, the pressure and temperature at the start of compression is 1 bar and 310 K. The pressure at the end of compression is 28 bar and at the end of heat addition is 75 bar. Calculate: (a) the compression ratio, (b) the maximum temperature in the cycle, (c) work ratio, (d) thermal efficiency.
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May 2008 An air standard Otto cycle operates with a compression ratio of 8.5:1. At the beginning of the compression the air is at 1 bar and 32°C and during the heat addition process the pressure is tripled. Calculate the thermal efficiency of the cycle.
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Dec 2008 An air standard Otto cycle has compression ratio 10, the compression begins at 37.8°C, 1 bar and maximum temperature of the cycle is 1050°C. Determine: (a) the heat supplied per kg of air, (b) the work done per kg of air, (c) the maximum pressure of the cycle, and (d) the thermal efficiency.
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Explain longitudinal strain, Poission's ratio, yield point and bulk modulus.Long Answer 8 Marks May-2008 • PTU B-TECH
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May 2011 Explain longitudinal and lateral strain, Poisson\'s ratio, yield point and bulk modulus.
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Dec 2008 Explain lateral strain, Young\'s modulus of elasticity and stress-strain curve.
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Compare the Otto Diesel and Dual cycle.Long Answer 8 Marks May-2008 • PTU B-TECH
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Write notes on Differential wheel and axle.Short Answer 4 Marks May-2008 • PTU B-TECH
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May 2011 Write brief notes on differential wheel and axle.
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Write notes on Lifting machines.Short Answer 4 Marks May-2008 • PTU B-TECH
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May 2011 Write brief notes on lifting machines.
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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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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.
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