Solved question paper for EME Dec-2007 (B-TECH 1st-2nd)
Solved Question Paper
Elements of mechanical engineering Dec-2007
PTU • B-TECH • Mechanical Engineering • 1st-2nd • Dec-2007
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-
Write steady flow energy equation for a steam turbine.Short Answer Dec-2007 • PTU B-TECH
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May 2023 Write down the general energy equations for steady flow system and simplify when applied to the following: b) Steam turbine
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Dec 2020 Write down the general energy equations for steady flow system and simplify when applied to the following: b) Steam turbine
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Represent isothermal and adiabatic processes on p-v chart.Short Answer Dec-2007 • PTU B-TECH
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Define thermodynamic state, path, process and cycle.Short Answer Dec-2007 • PTU B-TECH
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How zeroth law of thermodynamics is applied in thermometry?Short Answer Dec-2007 • PTU B-TECH
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How do you state flow and non flow work mathematically?Short Answer Dec-2007 • PTU B-TECH
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What is air standard efficiency? Write its expression for diesel cycle.Short Answer Dec-2007 • PTU B-TECH
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Dec 2020 Derive the expression for the efficiency of the Diesel cycle.
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Dec 2016 What is air standard efficiency? Write its expression for diesel cycle.
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Dec 2016 Derive the expression for the ideal efficiency of Diesel cycle.
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May 2015 Derive the efficiency equation for Diesel cycle.
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Dec 2014 Write down the expression for air standard efficiency for a diesel engine?
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May 2013 Derive an expression for the air standard efficiency and mean effective pressure of a Diesel cycle. State the assumptions made.
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May 2012 Derive an expression for efficiency and mean effective pressure for a Diesel cycle.
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Dec 2011 Derive an expression for mean effective pressure of diesel cycle.
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Define link, kinematic chain with example.Short Answer Dec-2007 • 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 2010 What is kinematic link.
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Dec 2009 Define kinematic link, kinematic pair and kinematic chain.
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State the law of lifting machine.Short Answer Dec-2007 • PTU B-TECH
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Dec 2010 State the law of lifting of machine.
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Differentiate between creep and fatigue.Short Answer Dec-2007 • PTU B-TECH
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May 2016 Differentiate between creep and fatigue.
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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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Draw differential wheel and axle arrangement.Short Answer Dec-2007 • PTU B-TECH
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A mass of 10 kg at room temperature is dropped from a height of 10 m into a bucket at room temperature containing 200 kg of water. Calculate the change in internal, potential and kinetic energies, heat and work transfer for case (a): Stone is just about to strike the water.Long Answer Dec-2007 • PTU B-TECH
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May 2011 A mass of 10 kg at room temperature is dropped from a height of 100 m into a pond containing 1000 kg of water at room temperature. Calculate the change in internal, potential and kinetic energies, heat and work transfer for the following three cases: (i) Stone is just about to strike the water. (ii) Stone just after striking the water, stopped immediately at the bottom of pond. (iii) Stone achieves the ambient temperature after reasonable amount of time.
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Dec 2007 A mass of 10 kg at room temperature is dropped from a height of 10 m into a bucket at room temperature containing 200 kg of water. Calculate the change in internal, potential and kinetic energies, heat and work transfer for case (b): Stone just stopped at bottom of bucket.
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A mass of 10 kg at room temperature is dropped from a height of 10 m into a bucket at room temperature containing 200 kg of water. Calculate the change in internal, potential and kinetic energies, heat and work transfer for case (b): Stone just stopped at bottom of bucket.Long Answer Dec-2007 • PTU B-TECH
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May 2011 A mass of 10 kg at room temperature is dropped from a height of 100 m into a pond containing 1000 kg of water at room temperature. Calculate the change in internal, potential and kinetic energies, heat and work transfer for the following three cases: (i) Stone is just about to strike the water. (ii) Stone just after striking the water, stopped immediately at the bottom of pond. (iii) Stone achieves the ambient temperature after reasonable amount of time.
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Dec 2007 A mass of 10 kg at room temperature is dropped from a height of 10 m into a bucket at room temperature containing 200 kg of water. Calculate the change in internal, potential and kinetic energies, heat and work transfer for case (a): Stone is just about to strike the water.
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During a non-flow frictionless compression process the volume changes from 0.12 m^3 to 0.04 m^3 and system rejects 40 kJ of heat. Determine the change in internal energy, heat loss and enthalpy if pressure varies with volume as p(bar) = 4.5(v) + 2; where v in m^3 and internal energy is given by the equation U = 40 – p(bar).v(m^3).Long Answer Dec-2007 • PTU B-TECH
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A steady operating pneumatic motor develops a shaft power of 0.1 kW when supplied with dry air at a pressure of 10 bar and at a temperature of 300 K and exhausting at 1 bar. The motor is adiabatic and the isentropic efficiency is 0.7. Determine the temperature of the air leaving the motor (°C) and mass flow rate.Long Answer Dec-2007 • PTU B-TECH
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An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the temperature at the end of compression.Long Answer Dec-2007 • PTU B-TECH
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Dec 2007 An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the work done during compression.
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Dec 2007 An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the interchange of heat between the air and the cylinder walls during compression.
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An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the work done during compression.Long Answer Dec-2007 • PTU B-TECH
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Dec 2007 An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the temperature at the end of compression.
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Dec 2007 An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the interchange of heat between the air and the cylinder walls during compression.
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An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the interchange of heat between the air and the cylinder walls during compression.Long Answer Dec-2007 • PTU B-TECH
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Dec 2007 An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the temperature at the end of compression.
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Dec 2007 An engine has a compression ratio of 5. The bore and stroke are 150 mm and 250 mm respectively. At the beginning of compression the air is at 1 bar and 27°C, compression then occur according to the law pv^1.2 = constant. Calculate the work done during compression.
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Calculate the change in entropy of the universe owing to the following process: 0.5 kg of copper block at 100°C is placed in water reservoir at 10°C.Long Answer Dec-2007 • PTU B-TECH
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Calculate the change in entropy of the universe owing to the following process: same block at 100°C is dropped from height of 100 mm into the reservoir and comes to rest without any change of temperature of the block.Long Answer Dec-2007 • PTU B-TECH
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Calculate the change in entropy of the universe owing to the following process: two blocks at 100°C and 0°C joined together.Long Answer Dec-2007 • PTU B-TECH
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Explain the working of four stroke IC engine with neat sketches.Long Answer Dec-2007 • 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 2016 Write short notes on working of two stroke petrol engine.
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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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Derive the expression for the air standard efficiency for dual cycle.Long Answer Dec-2007 • 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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May 2016 Derive an expression for efficiency and mean effective pressure for a Dual cycle.
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Explain the working of Oldham coupling.Short Answer Dec-2007 • 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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May 2008 What is the use of oldham\'s coupling?
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A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the mechanical advantage.Short Answer Dec-2007 • PTU B-TECH
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find mechanical advantage.
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find velocity ratio.
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find efficiency of the machine.
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Dec 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the velocity ratio.
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Dec 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the efficiency of the machine.
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A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the velocity ratio.Short Answer Dec-2007 • PTU B-TECH
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find mechanical advantage.
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find velocity ratio.
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find efficiency of the machine.
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Dec 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the mechanical advantage.
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Dec 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the efficiency of the machine.
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A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the efficiency of the machine.Short Answer Dec-2007 • PTU B-TECH
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find mechanical advantage.
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find velocity ratio.
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May 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400mm diameter. If the force of 16 N has to be applied to the wheel, find efficiency of the machine.
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Dec 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the mechanical advantage.
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Dec 2007 A weight of 48 N is to be raised by means of a wheel and axle. The axle is 100 mm diameter and wheel is 400 mm diameter. If the force of 16 N has to be applied to the wheel, find the velocity ratio.
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Define the following: lateral strain, stress, strength, resilience, Poisson’s ratio and bulk modulus.Short Answer Dec-2007 • PTU B-TECH
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Derive the expression for stress developed in any prismatic bar under thermal loading.Long Answer Dec-2007 • PTU B-TECH
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Write a note on mechanical behaviour of engineering material.Short Answer Dec-2007 • PTU B-TECH
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May 2007 Write a note on mechanical behaviour of engineering material.
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What do you understand by slider straight line mechanism? Explain the working of pantograph.Long Answer Dec-2007 • 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?
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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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06 Can I find papers for other subjects in the same Bachelor of Technology?
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