Solved question paper for EME May-2013 (B-TECH 1st-2nd)

Solved Question Paper

Elements of mechanical engineering May-2013

PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2013

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.

Solved Questions

Solved
  1. Convert 0.5 bar of pressure into: (i) mm of Hg, (ii) m of water.
    Short Answer 2 Marks May-2013 • PTU B-TECH
  2. What is the concept of continuum? How will you define density and pressure using this concept?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  3. Why does free expansion have zero work transfer?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  4. A Carnot engine with a fuel burning device as source and a heat sink cannot be treated as a reversible plant. Explain.
    Short Answer 2 Marks May-2013 • PTU B-TECH
  5. Why does entropy remain constant in a reversible adiabatic process?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  6. What is an air standard cycle? Why are such cycles conceived?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  7. What do you understand by section modulus?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  8. Explain centroidal axis and axis of symmetry with the help of an example.
    Short Answer 2 Marks May-2013 • PTU B-TECH
  9. Explain the terms machinability and maleability.
    Short Answer 2 Marks May-2013 • PTU B-TECH
  10. Explain different types of technological properties of materials.
    Short Answer 2 Marks May-2013 • PTU B-TECH
  11. Why would the name “thermostatics” be more appropriate than thermodynamics as applied to the science of thermal engineering?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  12. An ideal gas requires 1150 kJ/kg of heat to raise its temperature from 20°C to 100°C, when heated at constant pressure. When heat is supplied to the same gas at constant volume, the heat requirement is 825 kJ for the same temperature range. Determine specific heat at constant pressure, specific heat at constant volume and adiabatic exponent.
    Long Answer 6 Marks May-2013 • PTU B-TECH
  13. How is polytropic exponent determined and within what limits can it change?
    Short Answer 2 Marks May-2013 • PTU B-TECH
  14. A gas of mass 1.5 kg undergoes a quasi-static expansion which follows a relationship p = a + bV, where a and b are constants. The initial and final pressures are 1000 kPa and 200 kPa respectively and the corresponding volumes are 0.20 m3 and 1.2 m3. The specific internal energy of the gas is given by the relation u = 1.5 pv - 85 kJ/kg, where p is the kPa and v is m3/kg. Calculate the net heat transfer and the maximum internal energy of the gas attained during expansion.
    Long Answer 6 Marks May-2013 • PTU B-TECH
  15. Air flows steadily at a rate of 0.4 kg/s through an air compressor, entering at 6 m/s with a pressure of 1 bar and a specific volume of 0.85 m3/kg, and leaving at 4.5 m/s with a pressure of 6.9 bar and a specific volume of 0.16 m3/kg. The internal energy of the air leaving is 88 kJ/kg greater than that of the air entering. Cooling water in the jacket surrounding the cylinder absorbs heat from the air at the rate of 59 W. Calculate the power required to drive the compressor and the inlet and outlet cross-sectional area.
    Long Answer 8 Marks May-2013 • PTU B-TECH
  16. A reversible heat engine interacts with three thermal reservoirs at 750K, 650K and 550K respectively. The engine absorbs 2400 kJ/min of energy as heat from the reservoir at 750K and does 400 kJ/min of net work. Determine the magnitude and direction of heat interactions of the engine with other two reservoirs.
    Long Answer 4 Marks May-2013 • PTU B-TECH
  17. A reversible engine operates between a source at 1200K and two sinks, one at 400K and another at 300K. The heat rejected at both the sinks is same. Determine the thermal efficiency of the engine.
    Long Answer 4 Marks May-2013 • PTU B-TECH
  18. An ideal Diesel cycle using air as the working fluid has a compression ratio of 16 and a cutoff ratio of 2. The intake conditions are 100 kPa, 20°C, and 2000 cm3. Using the cold air standard assumptions, determine: (i) the T and P at the end of each process, (ii) the net work output, (iii) thermal efficiency, (iv) the mean effective pressure.
    Comprehension 4 Marks May-2013 • PTU B-TECH
  19. Determine the T and P at the end of each process for an ideal Diesel cycle using air as the working fluid having a compression ratio of 16, a cutoff ratio of 2, and intake conditions of 100 kPa, 20°C, and 2000 cm3, using the cold air standard assumptions.
    Long Answer 4 Marks May-2013 • PTU B-TECH
  20. Determine the net work output for an ideal Diesel cycle using air as the working fluid having a compression ratio of 16, a cutoff ratio of 2, and intake conditions of 100 kPa, 20°C, and 2000 cm3, using the cold air standard assumptions.
    Short Answer 4 Marks May-2013 • PTU B-TECH
  21. Determine the thermal efficiency for an ideal Diesel cycle using air as the working fluid having a compression ratio of 16, a cutoff ratio of 2, and intake conditions of 100 kPa, 20°C, and 2000 cm3, using the cold air standard assumptions.
    Short Answer 4 Marks May-2013 • PTU B-TECH
  22. Determine the mean effective pressure for an ideal Diesel cycle using air as the working fluid having a compression ratio of 16, a cutoff ratio of 2, and intake conditions of 100 kPa, 20°C, and 2000 cm3, using the cold air standard assumptions.
    Short Answer 4 Marks May-2013 • PTU B-TECH
  23. In order to check the validity of the second law, 1 kg of water at temperature T1 is isobarically mixed with m2 kg of water at temperature T2 (T1 > T2). Determine the change in the entropy of the universe and find an expression for the same for equal mass of water. Also prove that the change is necessarily positive.
    Long Answer 8 Marks May-2013 • PTU B-TECH
  24. Locate the centroid of a T-section 10 cm x 10 cm x 2 cm.
    Short Answer 4 Marks May-2013 • PTU B-TECH
  25. Find the mass moment of inertia of circular ring of radius R and mass M.
    Short Answer 4 Marks May-2013 • PTU B-TECH
  26. Give a neat sketch of the theoretical and actual pV diagrams for a four stroke Petrol engine. Describe briefly the factors which account for deviations between these plots.
    Long Answer 4 Marks May-2013 • PTU B-TECH
  27. What is cast iron? What are its uses? What is the effect of carbon, silicon, sulphur and phosphorus on its properties?
    Long Answer 4 Marks May-2013 • PTU B-TECH

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01 Where can I find elements of mechanical engineering previous year question papers for Bachelor of Technology, 1st-2nd semester?

This page lists elements of mechanical engineering question papers uploaded for Punjab Technical University Bachelor of Technology, 1st-2nd semester, organized for subject-wise browsing where available.

02 Are these official Punjab Technical University question papers?

BRpaper is not the official website of Punjab Technical University. These papers are shared for reference and revision purposes only and are not official university material.

03 How can previous year elements of mechanical engineering papers help in exam preparation?

Reviewing past papers can help you understand how questions are typically framed, notice commonly repeated topics, and get a sense of the exam pattern before your own exam.

04 What kind of topics does elements of mechanical engineering usually cover?

The question papers here relate to the official elements of mechanical engineering syllabus set by the university for this course and semester.

05 Does this page include a elements of mechanical engineering question bank or solved answers?

This page focuses on providing access to the previous year question papers themselves. A separate question bank or solved answers may not be available for every paper.

06 Can I find papers for other subjects in the same Bachelor of Technology?

Yes, BRpaper organizes papers by university, course, stream, and semester, so you can browse other subjects within the same Punjab Technical University Bachelor of Technology.