Solved question paper for EME Dec-2020 (B-TECH 1st-2nd)

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Solved Question Paper

Elements of mechanical engineering Dec-2020

PTU • B-TECH • Information Technology • 1st-2nd • Dec-2020

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.

Question papers (year-wise) Solutions

Solved Questions

Solved

What is a quasi-static process?

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2023 1(a) What is a quasi-static process?

May 2017 What is quasi-static and irreversible process?

May 2016 What is a quasi-static process?

May 2009 What do you understand by quasi-static process? How is it achieved?
What is a pure substance?

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2023 1(b) What is a pure substance?
Explain the term latent heat of steam.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2023 1(c) Explain the term latent heat of steam.
Explain the term dryness fraction of steam.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2023 1(d) Explain the term dryness fraction of steam.
What do you mean by PMM of the second kind?

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2020 What do you mean by PMM of first kind?

Dec 2020 What do you mean by PMM of first kind?

May 2010 What is PMM1?
Explain the first law of thermodynamics with respect to close systems.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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Dec 2023
Name and state the property introduced by the first law of thermodynamics.

Dec 2023 What is the essence of first law of thermodynamics? Write down expression for the first law applied to

May 2020 Explain briefly the zeroth law of thermodynamics.

Dec 2020 Explain briefly zeroth law of thermodynamics.

May 2016 Name and state the property introduced by the first law of thermodynamics.

Dec 2016 What is first law of thermodynamics?

May 2015 Define and explain the Zeroth law of thermodynamics.

May 2013 What is the essence of first law of thermodynamics? Write down expression for the first law applied to cycle.

May 2013 What is the essence of first law of thermodynamics? Write down expression for the first law applied to process.

Dec 2010 Define and explain the Zeroth law of thermodynamics. Why is it so called.

Dec 2009 Define and explain Zeroth law of thermodynamics? Why it is so called?

May 2008 What is zeroth law of thermodynamics?
Define the term availability.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2023 1(g) Define the term availability.
Define the term true stress.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2020 Define the term true stress.

Dec 2020 Define the term True Stress.

Draw (only) and list stress strain diagram of ductile materials.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2017 Draw and explain the stress-strain diagram for the ductile materials.

Dec 2014 Explain the stress starin diagram for ductile materials?
How the composites are different from conventional materials.

Short Answer 2 Marks Dec-2020 • PTU B-TECH

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May 2023 1(j) How the composites are different from conventional materials.
A fluid at a pressure of 3 bar, and with specific volume of 0.18 m^3/kg, contained in a cylinder behind a piston expands reversibly to a pressure of 0.6 bar according to law, p = C/V^2, where C is constant. Calculate the work done by the fluid on the piston.

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 A fluid at a pressure of 3bar, and with specific volume of 0.18m3/kg, contained in a cylinder behind a piston expands reversibly to a pressure of 0.6 bar according to law, p = C/V^2, where C is constant. Calculate the work done by the fluid on the piston.
0.15 m^3 of an ideal gas at a pressure of 15 bar and 550 K is expanded isothermally to 4 times the initial volume. It is then cooled at 290 K at constant volume and then compressed back polytropically to its initial state. Calculate the net work done and heat transferred during the cycle.

Long Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 0.15m3 of an ideal gas at a pressure of 15 bar and 550K is expanded isothermally to 4 times the initial volume. It is then cooled at 290K at constant volume and then compressed back polytropically to its initial state. Calculate the net work done and heat transferred during the cycle.

May 2011 A 0.2 m^3 of ideal gas at a pressure of 20 bar and 600 K is expanded isothermally to 1 m^3. It is then cooled to 300 K at constant volume and then compressed back polytropically to its initial state. Find net work done and the net heat transfer during the cycle.

May 2010 0.2 m3 of an ideal gas at a pressure of 2 MPa and 600 K is expanded isothermally to 5 times the initial volume. It is then cooled to 300 K at constant volume and then compressed back polytropically to its initial state. Determine the net work done and heat transfer during the cycle.
Write down the general energy equations for steady flow system and simplify when applied to the following: a) Reciprocating air compressor

Short Answer 8 Marks Dec-2020 • 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: a) Reciprocating air compressor

Dec 2014 Write the steady flow energy equation for compressor?
Write down the general energy equations for steady flow system and simplify when applied to the following: b) Steam turbine

Short Answer 8 Marks Dec-2020 • 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

Dec 2007 Write steady flow energy equation for a steam turbine.
The heat capacity of a system at constant volume is given by Cv = ZT^2, where Z = 0.045 J/K^3. A system is originally at 250 K, and a thermal reservoir at 125 K is available. Determine the maximum amount of work that can be recovered as the system is cooled down to the temperature of the reservoir.

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 The heat capacity of a system at constant volume is given by CV = ZT^2, where Z = 0.045J/K^3. A system is originally at 250K, and a thermal reservoir at 125K is available. Determine the maximum amount of work that can be recovered as the system is cooled down to the temperature of the reservoir.
An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Long Answer Dec-2020 • PTU B-TECH

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May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle id reversible.

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: d) Network per cycle

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: c) Efficiency

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: b) Percentage clearance

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: b) Percentage clearance

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: c) Efficiency

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: d) Network per cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: e) Mean effective pressure

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle is reversible.

May 2012 An engine working on Otto cycle has a volume of 0.5m3, pressure 1 bar and temperature 27°C at the beginning of the compression stroke. At the end of the compression stroke, the pressure is 10 bar, 210 kJ of heat is added during the constant volume heating process. Calculate the pressures, temperatures and volumes at the salient points of the cycle. Also find the percentage clearance, efficiency, network done per cycle and mean effective pressure.

An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: b) Percentage clearance

Short Answer Dec-2020 • PTU B-TECH

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May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle id reversible.

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: d) Network per cycle

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: c) Efficiency

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: b) Percentage clearance

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: c) Efficiency

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: d) Network per cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: e) Mean effective pressure

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle is reversible.

May 2012 An engine working on Otto cycle has a volume of 0.5m3, pressure 1 bar and temperature 27°C at the beginning of the compression stroke. At the end of the compression stroke, the pressure is 10 bar, 210 kJ of heat is added during the constant volume heating process. Calculate the pressures, temperatures and volumes at the salient points of the cycle. Also find the percentage clearance, efficiency, network done per cycle and mean effective pressure.
An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: c) Efficiency

Short Answer Dec-2020 • PTU B-TECH

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May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle id reversible.

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: d) Network per cycle

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: c) Efficiency

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: b) Percentage clearance

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: b) Percentage clearance

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: d) Network per cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: e) Mean effective pressure

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle is reversible.

May 2012 An engine working on Otto cycle has a volume of 0.5m3, pressure 1 bar and temperature 27°C at the beginning of the compression stroke. At the end of the compression stroke, the pressure is 10 bar, 210 kJ of heat is added during the constant volume heating process. Calculate the pressures, temperatures and volumes at the salient points of the cycle. Also find the percentage clearance, efficiency, network done per cycle and mean effective pressure.
An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: d) Network per cycle

Short Answer Dec-2020 • PTU B-TECH

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May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle id reversible.

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: d) Network per cycle

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: c) Efficiency

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: b) Percentage clearance

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: b) Percentage clearance

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: c) Efficiency

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: e) Mean effective pressure

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle is reversible.

May 2012 An engine working on Otto cycle has a volume of 0.5m3, pressure 1 bar and temperature 27°C at the beginning of the compression stroke. At the end of the compression stroke, the pressure is 10 bar, 210 kJ of heat is added during the constant volume heating process. Calculate the pressures, temperatures and volumes at the salient points of the cycle. Also find the percentage clearance, efficiency, network done per cycle and mean effective pressure.
An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: e) Mean effective pressure

Short Answer Dec-2020 • PTU B-TECH

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May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle id reversible.

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: d) Network per cycle

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: c) Efficiency

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: b) Percentage clearance

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: b) Percentage clearance

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: c) Efficiency

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: d) Network per cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle is reversible.

May 2012 An engine working on Otto cycle has a volume of 0.5m3, pressure 1 bar and temperature 27°C at the beginning of the compression stroke. At the end of the compression stroke, the pressure is 10 bar, 210 kJ of heat is added during the constant volume heating process. Calculate the pressures, temperatures and volumes at the salient points of the cycle. Also find the percentage clearance, efficiency, network done per cycle and mean effective pressure.
An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle is reversible.

Short Answer Dec-2020 • PTU B-TECH

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May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: f) Ideal power developed by the engine if the number of working cycles per minute is 210. Assume the cycle id reversible.

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: d) Network per cycle

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: c) Efficiency

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: b) Percentage clearance

May 2023 An engine working on otto-cycle has a volume of 0.45m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: a) Pressure, temperature and volume at a salient point in the cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: b) Percentage clearance

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: c) Efficiency

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: d) Network per cycle

Dec 2020 An engine working on otto-cycle has a volume of 0.45 m^3, pressure 1 bar and temperature 30°C at the beginning of compression stroke. At the end of compression stroke, the pressure is 11 bar. 210 kJ of heat is added at constant volume. Determine: e) Mean effective pressure

May 2012 An engine working on Otto cycle has a volume of 0.5m3, pressure 1 bar and temperature 27°C at the beginning of the compression stroke. At the end of the compression stroke, the pressure is 10 bar, 210 kJ of heat is added during the constant volume heating process. Calculate the pressures, temperatures and volumes at the salient points of the cycle. Also find the percentage clearance, efficiency, network done per cycle and mean effective pressure.
Derive the expression for the efficiency of the Diesel cycle.

Long Answer 8 Marks Dec-2020 • PTU B-TECH

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Dec 2016 What is air standard efficiency? Write its expression for diesel cycle.

Dec 2016 Derive the expression for the ideal efficiency of Diesel cycle.

May 2015 Derive the efficiency equation for Diesel cycle.

Dec 2014 Write down the expression for air standard efficiency for a diesel engine?

May 2013 Derive an expression for the air standard efficiency and mean effective pressure of a Diesel cycle. State the assumptions made.

May 2012 Derive an expression for efficiency and mean effective pressure for a Diesel cycle.

Dec 2011 Derive an expression for mean effective pressure of diesel cycle.

Dec 2007 What is air standard efficiency? Write its expression for diesel cycle.
Derive the expression for the efficiency of the Duel Cycle.

Long Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 Derive the expression for the efficiency of the following cycles: b) Duel Cycle

May 2023 Derive the expression for the efficiency of the following cycles: a) Diesel cycle

May 2016 Derive an expression for efficiency and mean effective pressure for a Dual cycle.

Dec 2007 Derive the expression for the air standard efficiency for dual cycle.
Discuss the following properties of the materials: a) Elasticity

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 Discuss the following properties of the materials: a) Elasticity
Discuss the following properties of the materials: b) Toughness

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 Discuss the following properties of the materials: d) Brittleness

May 2023 Discuss the following properties of the materials: b) Toughness

Dec 2020 Discuss the following properties of the materials: d) Brittleness
Discuss the following properties of the materials: c) Machinability

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 Discuss the following properties of the materials: c) Machinability
Discuss the following properties of the materials: d) Brittleness

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 Discuss the following properties of the materials: d) Brittleness

May 2023 Discuss the following properties of the materials: b) Toughness

Dec 2020 Discuss the following properties of the materials: b) Toughness
Locate the centroid of a trapezium with the base b and the parallel side's h1 and h2.

Short Answer 8 Marks Dec-2020 • PTU B-TECH

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May 2023 Locate the centroid of a trapezium with the base b and the parallel side\\\'s h1 and h2.

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