Solved question paper for EME Dec-2009 (B-TECH 1st-2nd)

Solved Question Paper

Elements of mechanical engineering Dec-2009

PTU • B-TECH • Information Technology • 1st-2nd • Dec-2009

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 are similarities and dissimilarities between heat and work?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  2. What is reversible process? Also write conditions for reversibility.
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  3. Why gases have two specific heats?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  4. What is PMM1 (perpetual motion machine of first kind)?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  5. How COP of heat pump and refrigerator are related?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  6. What is mean effective pressure and what is its role in gas power cycles?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  7. List different systems of pulleys.
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  8. What are temperature stresses?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  9. What is significance of elastic constant?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  10. What are the limitations of first law of thermodynamics?
    Short Answer 2 Marks Dec-2009 • PTU B-TECH
  11. Define and explain Zeroth law of thermodynamics? Why it is so called?
    Long Answer Dec-2009 • PTU B-TECH
  12. A new temperature scale in degrees N is desired with freezing point at 100°N and the boiling point at 400°N. Establish a correlation between degrees Celsius and degrees N. What would be the absolute temperature at 0°N?
    Long Answer Dec-2009 • PTU B-TECH
  13. An air initially at 90 kPa pressure, 700 K temperature and occupying a volume of 0.5 m3 is compressed isothermally till the volume is halved and further it goes compression at constant pressure till the volume is halved again. Sketch the process on p-V diagram and make calculations for total work done and total heat interaction for the two processes. Assume ideal gas behaviour for air and take c_v = 1.004 kJ/kg K.
    Long Answer Dec-2009 • PTU B-TECH
  14. Explain and derive steady flow energy equation.
    Long Answer Dec-2009 • PTU B-TECH
  15. A perfect gas flows through a nozzle where it expands in a reversible adiabatic manner. The inlet conditions are 22 bar, 500°C, 38 m/s. At the exit the pressure is 2 bar. Determine the velocity and exit area if the flow rate is a kg/s. Take R = 190 J/kg K and T = 1.35.
    Long Answer Dec-2009 • PTU B-TECH
  16. State and explain Carnot theorem.
    Long Answer Dec-2009 • PTU B-TECH
  17. Write various statements of second law of thermodynamics and also show their equivalence.
    Long Answer Dec-2009 • PTU B-TECH
  18. A reversible heat engine operates within the higher and lower temperature limits of 1400 K and 400 K respectively. The entire output from this engine is utilized to operate a heat pump. The pump works on reversed Carnot cycle, extracts heat from a reservoir at 300 K and delivers it to the reservoir at 400 K. If 100 kJ/s of net heat is supplied to the reservoir at 400 K, calculate the heat supplied to the engine by the reservoir at 1400 K.
    Long Answer Dec-2009 • PTU B-TECH
  19. In an air standard diesel cycle, the compression ratio is 15 and the pressure and temperature of the air at the beginning of the compression are 1 bar and 288 K. The peak temperature in the cycle is 2700 K. Calculate the heat supplied.
    Long Answer Dec-2009 • PTU B-TECH
  20. In an air standard diesel cycle, the compression ratio is 15 and the pressure and temperature of the air at the beginning of the compression are 1 bar and 288 K. The peak temperature in the cycle is 2700 K. Calculate the work done.
    Long Answer Dec-2009 • PTU B-TECH
  21. In an air standard diesel cycle, the compression ratio is 15 and the pressure and temperature of the air at the beginning of the compression are 1 bar and 288 K. The peak temperature in the cycle is 2700 K. Calculate the cycle efficiency.
    Long Answer Dec-2009 • PTU B-TECH
  22. In an air standard diesel cycle, the compression ratio is 15 and the pressure and temperature of the air at the beginning of the compression are 1 bar and 288 K. The peak temperature in the cycle is 2700 K. Calculate the peak pressure of the cycle.
    Long Answer Dec-2009 • PTU B-TECH
  23. In an air standard diesel cycle, the compression ratio is 15 and the pressure and temperature of the air at the beginning of the compression are 1 bar and 288 K. The peak temperature in the cycle is 2700 K. Calculate the cut-off ratio.
    Long Answer Dec-2009 • PTU B-TECH
  24. In an air standard diesel cycle, the compression ratio is 15 and the pressure and temperature of the air at the beginning of the compression are 1 bar and 288 K. The peak temperature in the cycle is 2700 K. Calculate the mean effective pressure.
    Long Answer Dec-2009 • PTU B-TECH
  25. Draw stress-strain diagram and explain various salient features.
    Long Answer Dec-2009 • PTU B-TECH
  26. A conical bar tapers uniformly from a diameter of 4 cm to 15 cm in a length of 40 cm. If an axial force of 80 kN is applied at each end, determine the elongation of the bar. Take E = 200 GPa.
    Long Answer Dec-2009 • PTU B-TECH
  27. Define kinematic link, kinematic pair and kinematic chain.
    Long Answer Dec-2009 • PTU B-TECH
  28. In a differential wheel and axel, the diameter of the larger axel is 250 mm and that of the smaller is 225 mm. The diameter of the effort wheel is 500 mm. Find the velocity ratio. If an effort of 150 N lifts a load of 3.5 kN, what is the efficiency and effort lost in friction?
    Long Answer Dec-2009 • 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?

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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.

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