Punjab Technical University 2008-3rd Sem B.Tech Mechanical Engineering MANUFACTURING PROCESS I ME 209 2k5 - Question Paper

MANUFACTURING PROCESS I ME 209 third Sem May 2k5
Note: part A is compulsory. Attempt any 4 ques. from part B and any 2 from part C.

part A Marks two every

1.
(a) What is meant by production rate and quantity of production?
(b) Under what circumstances, wooden trends are prepared over metallic patterns?
(c) Differentiate ranging from the melting process using cupola and arc furnaces.
(d) What is the function of gates in a mould?
(e) Under what circumstances, machine moulding is preferred?
(f) What is meant by machinability?
(g) elaborate the characteristic features of turrets?
(h) Name the conventional processes to attain flat surfaces.
(i) What is the basic difference ranging from a shaper and a planer.
(j) discuss why super finishing processes are used after machining.

part B Marks five every

2. define shell moulding in brief and when it is used.

3. Draw the neat sketch of cupola. In what ways is the melting cupola differ from other kinds of melting furnaces?

4. Determine the cutting time needed in face milling a workpiece 400 mm diameter and 250 mm wide with a face mill of 100 mm diameter having a eight teeth. Depth of cut is three mm, cutting speed = 75 m/min and feed = 0.07 mm/tooth.

5. compute the h.p. needed to drill a 7/8 inch hole in M.S. at 250 r.p.m. and a feed of 0.011 inch per revolution. obtain also the power absorbed per unit of metal removed per minute. Take constant ‘C’ for M.S. as 1800.

6. define the method of selection of grinding wheel according to Indian standard.

part C Marks 10 every

7. elaborate different trend allowances? define briefly. Also discuss different kinds of trends along with their utilities.

8. (a) discuss different angles of a single point cutting tool with the help of a sketch.

(b) Estimate what cut would be taken on a lathe turning bronze bars at 0.625 mm feed and 20 meters per min, if 3.4 h.p. were available and 30% of the power were lost in friction. presume K for bronze = 16000

9 (a) describe different finish processes like honing, lapping, buffing and super finishing. elaborate their applications?
(b) compute the differential indexing to provide 73 divisions.

Earning:   Approval pending.