Solved question paper for EME May-2018 (B-TECH 1st-2nd)

Solved Question Paper

Elements of mechanical engineering May-2018

PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2018

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. What is meant by thermodynamic equilibrium? How does it differ from thermal equilibrium?
    Short Answer 2 Marks May-2018 • PTU B-TECH
  2. What is significance of ∫ pdv in a non-flow system?
    Short Answer 2 Marks May-2018 • PTU B-TECH
  3. Differentiate between pv and pdv and give examples of the inclusion of these terms in energy equation.
    Short Answer 2 Marks May-2018 • PTU B-TECH
  4. Why Carnot cycle cannot be used practically?
    Short Answer 2 Marks May-2018 • PTU B-TECH
  5. What does the principle of increase of entropy specify?
    Short Answer 2 Marks May-2018 • PTU B-TECH
  6. List the assumptions made in the analysis of air standard cycles.
    Short Answer 2 Marks May-2018 • PTU B-TECH
  7. What is the function of compression and oil control rings provided on the piston of an IC engine?
    Short Answer 2 Marks May-2018 • PTU B-TECH
  8. State the condition of reversibility and self-locking of a machine.
    Short Answer 2 Marks May-2018 • PTU B-TECH
  9. A composite bar constituting of iron and copper in parallel is heated. What would be the nature of the thermal stresses induced in the two bars?
    Short Answer 2 Marks May-2018 • PTU B-TECH
  10. Define resilience, proof resilience and modulus of resilience.
    Short Answer 2 Marks May-2018 • PTU B-TECH
  11. A mass of 1.5 kg of air is compressed in a quasi-static process from 1.1 bar to 10 bar according to the law pV1.25 = Constant. The initial density of air is 1.2 kg/m3. Find the work involved in the compression process.
    Long Answer 4 Marks May-2018 • PTU B-TECH
  12. What is the concept of continuum? How density and pressure are defined using this concept?
    Short Answer 4 Marks May-2018 • PTU B-TECH
  13. A 0.2 m3 of a gas at 400 kPa and 127°C is contained in a cylinder. A reversible adiabatic expansion takes place to a pressure of 100 kPa. The gas is then heated by an isobaric process till the enthalpy increase is 72 kJ. Find the net work done.
    Long Answer May-2018 • PTU B-TECH
  14. A 0.2 m3 of a gas at 400 kPa and 127°C is contained in a cylinder. A reversible adiabatic expansion takes place to a pressure of 100 kPa. The gas is then heated by an isobaric process till the enthalpy increase is 72 kJ. Find the index of expansion if the above processes are replaced by a single reversible polytropic process giving the same work between the same initial and final states.
    Long Answer May-2018 • PTU B-TECH
  15. Make an energy analysis of a centrifugal pump.
    Short Answer 2 Marks May-2018 • PTU B-TECH
  16. A centrifugal pump delivers 50 kg of water per second. The inlet and outlet pressures are 1 bar and 4.2 bar respectively. The suction is 2.2 m below the centre of the pump and delivery is 8.5 m above the centre of the pump. The suction and delivery pipe diameters are 20 cm and 10 cm respectively. Find the capacity of electric motor to run the pump.
    Long Answer 6 Marks May-2018 • PTU B-TECH
  17. Derive an expression for the efficiency of a heat engine. What is the normal range of efficiency of heat engine?
    Long Answer 3 Marks May-2018 • PTU B-TECH
  18. Which is more effective way to increase the efficiency of a Carnot heat engine: to increase the source temperature T1, while the sink temperature T2 is held constant, or to decrease the sink temperature by the same amount while the source temperature is held constant? How this result would be affected in case of a Carnot heat pump?
    Long Answer 5 Marks May-2018 • PTU B-TECH
  19. 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.
    Long Answer May-2018 • PTU B-TECH
  20. 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.
    Long Answer May-2018 • PTU B-TECH
  21. 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.
    Long Answer May-2018 • PTU B-TECH
  22. 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.
    Long Answer May-2018 • PTU B-TECH
  23. Prove that heat absorbed during a process is approximately equal to the change in entropy multiplied by the mean absolute temperature during process.
    Long Answer 4 Marks May-2018 • PTU B-TECH
  24. Show that whenever a system executes a complete cyclic process, ∮ is less than zero or in the limit is equal to zero.
    Long Answer 4 Marks May-2018 • PTU B-TECH
  25. A rectangular steel plate 100 cm long, 40 cm wide and 2 cm thick is subjected to bi-axial stress σx and σy acting along length and width respectively. If the increase in length is 0.6 mm and the increase in width is 0.09 mm, calculate σx and σy.
    Long Answer May-2018 • PTU B-TECH
  26. A rectangular steel plate 100 cm long, 40 cm wide and 2 cm thick is subjected to bi-axial stress σx and σy acting along length and width respectively. If the increase in length is 0.6 mm and the increase in width is 0.09 mm, calculate the change in thickness of the plate.
    Short Answer May-2018 • PTU B-TECH
  27. A rectangular steel plate 100 cm long, 40 cm wide and 2 cm thick is subjected to bi-axial stress σx and σy acting along length and width respectively. If the increase in length is 0.6 mm and the increase in width is 0.09 mm, calculate the change in volume of the plate.
    Short Answer May-2018 • PTU B-TECH
  28. Give a neat sketch of the theoretical and actual pV diagrams for a four stroke Diesel engine. Describe briefly the factors which account for deviations between these plots.
    Long Answer 4 Marks May-2018 • PTU B-TECH
  29. Sketch and briefly explain any two inversions of a double slider crank chain.
    Long Answer 4 Marks May-2018 • PTU B-TECH

Explore all data

FAQ

Frequently Asked Questions

Answers about this subject, solved papers, and preparation.

Updated regularly
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.