Solved question paper for EME May-2012 (B-TECH 1st-2nd)

Solved Question Paper

Elements of mechanical engineering May-2012

PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2012

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. Show that work is a path function.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  2. What is a free expansion process? What are its characteristics?
    Short Answer 2 Marks May-2012 • PTU B-TECH
  3. Differentiate between a heat pump and a refrigerator.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  4. Draw the variation of thermal efficiency against compression ratio of an Otto cycle.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  5. What is function of piston rings in an internal combustion engine?
    Short Answer 2 Marks May-2012 • PTU B-TECH
  6. Differentiate between brass and bronze.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  7. What are technological properties of materials?
    Short Answer 2 Marks May-2012 • PTU B-TECH
  8. What is moment of inertia and why is it called second moment of area?
    Short Answer 2 Marks May-2012 • PTU B-TECH
  9. Differentiate between thermoplastic and thermosetting plastic.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  10. An inventor of heat engine claims that his engine is 75% efficient which receives heat at 100°C and rejects at 20°C. How do you rate his claim?
    Short Answer 2 Marks May-2012 • PTU B-TECH
  11. A mass of gas is compressed in a quasi-static process from 80kPa, 0.1m3 to 0.4 MPa, 0.03m3. Assume that pressure and volume are related by pV n = Constant. Find the work done by the gas system.
    Short Answer 5 Marks May-2012 • PTU B-TECH
  12. Define control volume and control surface. How does control volume differ from an open system?
    Short Answer 3 Marks May-2012 • PTU B-TECH
  13. Write down the general steady flow energy equation and deduce it for a nozzle, stating the assumptions taken.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  14. Steam enters a steam turbine at 5 m elevation, at a velocity of 30 m/s, enthalpy 2950 kJ/kg. At exit, the velocity is 600 m/s, enthalpy 2200 kJ/kg and elevation 2 m. 75 kJ/kg of heat is lost to the surroundings. Calculate the work output of the turbine.
    Short Answer 6 Marks May-2012 • PTU B-TECH
  15. State and prove Clausius inequality.
    Long Answer 4 Marks May-2012 • PTU B-TECH
  16. In a refrigerator, heat is transferred from a lower temperature to higher temperature. Is this a violation of second law of thermodynamics? Explain.
    Short Answer 4 Marks May-2012 • PTU B-TECH
  17. Define the term entropy. Show that entropy is a property of the system.
    Short Answer 4 Marks May-2012 • PTU B-TECH
  18. Heat flows from a hot reservoir at 800 K to another reservoir at 250 K. If the entropy change of overall process is 4.25 kJ/K, make calculations for the heat flowing out of the high temperature reservoir.
    Short Answer 4 Marks May-2012 • PTU B-TECH
  19. Derive an expression for efficiency and mean effective pressure for a Diesel cycle.
    Long Answer 8 Marks May-2012 • PTU B-TECH
  20. Find the moment of inertia of a semi circle about its diametrical axis.
    Short Answer 4 Marks May-2012 • PTU B-TECH
  21. Find the centroid of a quarter of a circle.
    Short Answer 4 Marks May-2012 • PTU B-TECH
  22. Discuss the composition, specific properties and main applications of Mild steel.
    Long Answer 6 Marks May-2012 • PTU B-TECH
  23. Discuss the composition, specific properties and main applications of High carbon steel.
    Long Answer 6 Marks May-2012 • PTU B-TECH
  24. Discuss the composition, specific properties and main applications of High speed steel.
    Long Answer 6 Marks May-2012 • PTU B-TECH
  25. Discuss the composition, specific properties and main applications of Stainless steel.
    Long Answer 6 Marks May-2012 • PTU B-TECH
  26. State Thermochromic effect.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  27. State Photochromic effect.
    Short Answer 2 Marks May-2012 • PTU B-TECH
  28. A gas engine working on Otto cycle has cylinder bore (diameter) = 220 mm; stroke length = 300 mm, clearance volume = 1600 cm3. Find the air standard efficiency. Take γ = 1.4.
    Short Answer 4 Marks May-2012 • PTU B-TECH
  29. List the major factors affecting the selection of materials.
    Short Answer 4 Marks May-2012 • 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.