Exam Details

Subject mechanical engineering
Paper
Exam / Course
Department
Organization gujarat public service commission
Position
Exam Date 2014
City, State gujarat,


Question Paper

1. What is the difference between local acceleration and convective acceleration in fluid mechanics

2. What is the main function of draft tube

3. State corollary of Carnot's theorem.

4. What is the difference between psychometric process in desert cooler and air conditioner

5. What are the main parameters need to be maintained in the biomass digester

6. Write electricity flow analogy in case of heat transfer by conduction.

7. What is the range of wavelength of thermal radiation and visible light

8. State the condition for a perfect two dimensional truss along with an example.

9. Define point of contra flexure. What will be the value of shear force at this point

10. What is the difference between accuracy and precision

11. State and briefly explain the concept of vibration isolation.

12. State the principle of interferometry.

13. List the five types of gears and its applications.

14. What is Reynolds number Write the ranges of Reynolds number for laminar and turbulent flow.

15. What are the specific limitations of solar energy

16. Write Kelvin Planck's statement of Second Law of thermodynamics.

17. Write a brief note on powder metallurgy and its use in industries.

18. What do you understand by factor of safety

19. Briefly describe the characteristics of C language and the reason for its use as a professional language.

20. Write a note on friction drives.

21. The tool signature of a single point cutting tool as per American Standards Association is given below:
10-20-7-6-8-15-0.8 mm
Draw well-labelled diagrams of top view,Front view and Side view of this single point cutting tool.

22. Draw the stress-strain curves for the following engineering materials.
Mild steel,
ii) Aluminium and
iii) Cast iron
Are strength and stress material properties

23. "In sand casting process, Sprue is designed tapered". Do you agree with the statement Justify your answer recalling fundamentals for fluid mechanics.

24. Define cold working. Draw a figure showing the effect of cold working on the mechanical properties (Tensile strength, Yield strength, and Elongation of pure copper.

25. Differentiate between boiler mountings and acccessories.

26. Which is the basis on which a fluid machine is termed as a turbine or a pump (or compressor)

What is meant by rotodynamic fluid machine and positive displacement type fluid machine.

27. What do you mean by critical thickness of insulation over a cylindrical pipe

28. Describe step by step procedure for dynamic force analysis of four bar mechanism.

29. Draw neat sketch of Oldham coupling and explain its constructional features. List the various advantages and disadvantages of Oldham coupling.

30. In gas welding of mild steel using oxy-acetylene flame,the total amount of acetylene consumed was 20 litre. What would be the oxygen consumption from the cylinder

31. How does domestic solar water heater works

32. Which of the non-traditional machining operation among USM, EDM and ECM is mainly used to machine GLASS Draw its schematic diagram.

33. The speeds and feeds selected for boring operation on a lathe are generally less than those recommended for turning operation. Explain reasons recalling fundamentals for deflection of beams.

34. What is the difference between reaction and impulse turbines Show that maximum hydraulic efficiency of pelton wheel turbine is cos where beta is the bucket angle from horizontal direction.

35. Draw well labelled Iron-Carbon equilibrium diagram. Draw the cooling curve for pure iron.

"Quenching is always following by tempering heat treatment process". Do you agree with the statement Justify in either case.

36. Compare the efficiency of Otto and Diesel cycles for constant compression ratio and heat rejection.

37. Explain the meaning of
feasible solution
basic feasible solution while solving transportation problems.

Solve the folloing LPP by graphical method.
Minimize Z 20X1 40X2
subject to constraints
36X1 6X2 108
3X1 12X2 36
20X1 10X2 100
X1,X2 0

38. Draw the Merchant's circle diagram for orthogonal machining and state Merchant's model assumptions. Derive equations for various forces using the Merchant's circle. Also derive equation equation for shear stress on the shear plane for orthogonal machining.

39. A mild steel spur gear having 51 teeth and 2 mm module is to be machined on milling machine.
Calculate gear proportions (blank diameter, pitch circle diameter, tooth height) and machining particulars (indexing procedure, cutting speed, feed rate and depth of cut) for satisfactory machining.


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