Solved question paper for EME Dec-2016 (B-TECH 1st-2nd)

Solved Question Paper

Elements of mechanical engineering Dec-2016

PTU • B-TECH • Mechanical Engineering • 1st-2nd • Dec-2016

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. Explain the difference between temperature, heat and internal energy.
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  2. State the basic assumptions of steady flow energy equation.
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  3. Why does the enthalpy of an ideal gas depend upon temperature only?
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  4. State Carnot theorem for an engine and a refrigerator.
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  5. How does the Second law of thermodynamics overcome the limitation of the First law?
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  6. What is the function of crank shaft and flywheel in an IC engine?
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  7. What is air standard efficiency? Write its expression for diesel cycle.
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  8. What is mild steel? How is it different from cast iron and wrought iron?
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  9. How does stainless steel become stainless?
    Short Answer 2 Marks Dec-2016 • PTU B-TECH
  10. Define centre of gravity and centroid.
    Short Answer 2 Marks Dec-2016 • 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 pV^1.25 = Constant. The initial density of air is 1.2 kg/m^3. Find the work involved in the compression process.
    Long Answer 4 Marks Dec-2016 • PTU B-TECH
  12. What is the concept of continuum? How density and pressure are defined using this concept?
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  13. Steam enters a nozzle at a pressure of 7 bar and 205°C (i.e. initial enthalpy 2850 kJ/kg) and leaves at a pressure of 1.5 bar. The initial velocity of steam at the entrance is 40 m/s and exit velocity from the nozzle is 700 m/s. The mass flow rate through the nozzle is 1400 kg/hr. The heat loss from the nozzle is 11705 kJ/hr. Determine the final enthalpy of steam and the nozzle exit area, if the specific volume is 1.24 m^3/kg.
    Long Answer 8 Marks Dec-2016 • PTU B-TECH
  14. Prove that the efficiency of an engine working on a reversible cycle depends only on the temperature of source and sink and is independent of the working fluid.
    Long Answer 4 Marks Dec-2016 • PTU B-TECH
  15. Comment on the validity of the statement: All reversible engines operating between the same two thermal reservoirs have the same efficiency.
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  16. Define entropy and show that for an irreversible process, dS > δQ/T.
    Long Answer 4 Marks Dec-2016 • PTU B-TECH
  17. Heat flows from a reservoir at 800 K to another reservoir at 250 K. If entropy change of the hot reservoir is –4 kJ/K, determine the entropy change of the cold reservoir.
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  18. Derive an expression for efficiency and mean effective pressure of Otto cycle.
    Long Answer 8 Marks Dec-2016 • PTU B-TECH
  19. Find the moment of inertia of a circle about its diametrical axis.
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  20. Find the centroid of a quarter of a circle.
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  21. Discuss the effect of following alloying elements in steel: Chromium, Nickel, Tungsten, Sulphur.
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  22. What are ceramics? Explain classification of ceramics. Also write properties and application of ceramics.
    Long Answer 4 Marks Dec-2016 • PTU B-TECH
  23. Explain briefly particle-reinforced, fibre-reinforced and structural composite.
    Short Answer 4 Marks Dec-2016 • PTU B-TECH
  24. A diesel engine takes in air at 1 bar and 27°C. The compression and expansion ratios are 18 and 6 respectively. Estimate the quantity of heat energy added, rejected and the efficiency of the cycle. Take γ = 1.4, cp = 1.005 kJ/kg-K, and cv = 0.717 kJ/kg-K.
    Long Answer 4 Marks Dec-2016 • 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.