2

17. ASHRAE designation of commonly used refrigerants are given below. Write the chemical formula of
these refrigerants.
1) ६४-22
2) R-134a
3) 8-0
4) R-410A
5) 8-7 (5 Marks)

18. Howa lathe is specified ? List the components of a lathe. List out atleast eight cutting operations that
can be performed on a lathe. (7 Marks)

19, Draw the bending moment and shear force diagrams of a simply supported beam subjected to
uniformly distributed load. (7 Marks)

20. The yearly demand for an item is 3200 units. The unit cost is Rs. 6 and the holding charges amounts
to be 25% per annum. If the cost of one procurement is Rs. 150.
Determin

a) Economic order quantity

b) No. of orders per year

யி Time between two consecutive orders

d) The optimum inventory system cost (7 Marks)

21. What are the four basic steps that are usually involved in making products by powder metallurgy ? What
are the limitations of powder metallurgy parts ? State any two applications of powder metallurgy. (7 Marks)

22. Draw ideal vapour compression refrigeration on Pressure-enthalpy (P-h) or Temperature-entropy ടി
chart. How an actual vapour compression system is different from ideal ? Use P-h or T-s diagram to

explain the difference. (7 Marks)
23. Draw P-v and T-s diagram of the Brayton cycle. Derive an expression for the efficiency of the cycle in

terms of pressure ratio. (10 Marks)
24. Draw Iron-Carbon equilibrium diagram and indicate key phases and structures. (10 Marks)
25. Show that velocity profile in a fully developed laminar pipe flow must be a paraboloid of

revolution. ∙ 5 (10 Marks)
26. Compare two stroke and four stroke engines (Atleast eight different aspects). (10 Marks)
27. Compare soldering, brazing and welding operations (Atleast five different aspects). (10 Marks)
28. Discuss any four theories of failure. (10 Marks)

29. Establish the equivalence of Kelvin-Planck and Clausius statements of the second law of
thermodynamics. (10 Marks)

30. State the advantages and disadvantages of using CNC system (Atleast five advantages and
disadvantages). (10 Marks)

31. Derive an expression for one-dimensional heat flow in radial direction through a hollow cylinder.
What is critical radius of insulation ? Derive critical radius of insulation in the case of circular pipe. (10 Marks)

32. List out the different types of plant layout. Explain the features of each. (10 Marks)