Test Papers / Previous Question Papers of Indira Gandhi National Open University BME003 Manufacturing Technology June 2007

Term-End Examination

BME003 : Manufacturing Technology

Time : 3 hours
Maximum Marks : 70 marks

June 2007

1. Choose the correct answer from the given alternatives:

(i) Pit furnace can be used for melting of
(a) Cast iron
(b) Aluminium
(c) Brass
(d) Any of the above
(e) None of the above

(ii) Which wood can be used for making patterns?
(a) Mahogany
(b) Pine wood
(c) Teak wood
(d) Atry of the above
(e) None of the above

(iii) Wax patterns are used in
(a) Non ferrous castings
(b) Investment casting Process
(c) Machining moulding Process
(d) All of the above
(e) None of the above

(iv) Cohesiveness of sand depends on
(a) Grain size and shape of sand particles
(b) Bonding material
(c) Moisture content
(d) All of the above
(e) None of the above

(v) The main criterion for selection of electrode diameter in arc welding is
(a) Material of job to be welded
(b) TyPe of welding Process
(c) Thickness of lob to be welded
(d) Voltage used
(e) Current used

(vi) The material used for coating the electrode is called
(a) Protective layer
(b) Binder
(c) Slag
(d) Deoxidiser
(e) Flux

(vii) Copper is
(a) Easily spot welded
(b) Very difficult to be spot welded
(c) As good for spot welding as any other material
(d) Preferred to be welded by spot welding
(e) None of the above

(viii) The draft allowance on pattern is provided in order to
(a) Provide good draft of air in the sand moulding
(b) Provide for distortion that might take place
(c) Remove the pattern easily from the moulding.
(d) Increase the strength of the mould walls
(e) Push the pattern easily into the moulding

(ix) In which of the following operations on lathe, will the spindle speed be minimum?
(a) Knurling
(b) Fine finishing
(c) Thper turning
(d) Parting off
(e) Thread cutting

(x) Lathe bed is usually made of
(a) Structutal steel
(b) Stainless steel
(c) Cast iron
(d) Mild steel
(e) Non ferrous materials

2. (a) Describe the process carried out to remove impurities from the furnace. (5)

(b) Write the different melting process operations in Cupola furnace. (3)

(c) Name the iron ores charged in the blast furnace (2)

3. (a) Write the requirements which must be fulfilled by sand used for moulding. (5)

(b) What are the principal ingredients of moulding sand? (3)

(c) How is the moulding sand specified? (2)

4. (a) What are the advantages of centrifugal casting over other casting processes? (5)

(b) Write the main variables in the centrifugal casting. (3)

(c) Write at least four applications of Investment casting. (2)

5. (a) A tensile specirnen with 12 mm diameter and gauge length of 60 cm reaches maximum tensile load at 98 kN and fractures at 7 4 kN. The minimum diameter at fracture is 9 mm. Determine the engineering stress at maximum load, true fracture stress, true strain at fracture and engineering strain

(b) Why does the engineering stress strain curve not give a true indication of the deformation characteristics of a rnaterial? (3)

(c) Differentiate between hot working and cold working. (2)

6. (A) A power hammer is a forging press works. at a pressure of 65 x 10^-6 Nmm^-2. lt has a ram of mass 28 kg. The diameter of the ram cylinder is 620 mm and the ram falls from a height of 320 mm. Calculate the blow energy and velocity of ram at the start of deforrnation. (5)

(b) Differentiate between drawing and swaging. (3)

(c) Write applications of extrusion. (2)

7. (a) What is shearing process? Explain with the help of neat diagrarns. (5)

(b) What should be shear strength of an annealed steel sheet of 7 mm thickness on which 45 mm diameter hole is to be punched by applying a lorce of 3 0 kN ? (3)

(c) Define slitting (2)

8. (a) How are the cutting tools classified? Describe with the help of neat diagrams. (5)

(b) Describe the various types of drills. (3)

(c) Which machine can be used to make internal threads in a cylindrical block?

9. (a) Describe the effe:ct of various cutting conditions on the cutting force in rnachining. (5)

(b) Write the desired properties of a cutting fluid. (3)

(c) What is taper turning? (2)

10. (a) What is ideal weld? What are the basic requirements to obtain sound weld joint? (5)

(b) What are various sources of heat for producing welded joint? (3)

(c) Differentiate between melting and fusion (2)