MANUFACTURING

Aryabhatta Knowledge University

MANUFACTURING

  Sem. iv   2013                                    Time 3hr                        Full marks: 70

Attempt any five questions in which question no 1 is compulsory

1.       Choose the correct answer(any seven):

(a)    In a centrifugal method casting method

(i)                  Core is made of sand

(ii)                Core is made of ferrous metal

(iii)               Core may be made of any metal

(iv)              No core is used

(b)   The  binder in the case of synthetic sand ,is

(i)                  Water

(ii)                Clay

(iii)               Molasses

(iv)              Bentonite and water

(c)    Carburettors are manufactured by

(i)                  Fine sand casting

(ii)                Die casting

(iii)               Slush casting

(iv)              Shell moulding

(d)   In metals subjected to cold working condition ,strain hardening effect is due to____

(i)                  Slip

(ii)                Twinning

(iii)               dislocation

(iv)              fracture

(e)   A forging method for reducing the diameter of a bar and in the process making it longer

Is termed as

(i)                  Fullering

(ii)                Punching

(iii)               upsetting

(iv)              stamping

(f)     the brazing joint can be satisfactorily made on an article made of

(i)                  tin

(ii)                copper

(iii)               aluminium

(iv)              galvanized sheet

(g)    the electric resistance welding operates with

(i)      low current and high voltage

(ii)    low current low voltage

(iii)   high current low  voltage

(iv)  high current and high voltage

(h)   in MIG welding ,the metal is transformed in the form of

(i)      molecules

(ii)    fine spray of metal

(iii)   weld pool

(iv)  molten drops

(i)      injection moulding process is suitable for

(i)      thermosetting plastic

(ii)    thermoplastics

(iii)    both of the above

(iv)  None of the above

(j)     High speed gears are made from plastic of the type of

(i)                  Foalite

(ii)                Fibreglass

(iii)               Capron

(iv)              Polyethylene

2.       (a)   What are the advantages of casting process over other shaping process?

(b)   Write the uses of (i) gates ,(ii) riser ,(ii) core and (iv) chills

(c) On what factors , the selection of a suitable  core sand depends?

3.       What do you understand by ‘centrifugal casting’? describe the process of true centrifugal casting with the help of a neat diagram. What are its advantages and disadvantages?

4.       (a) What are crucible furnaces? where are they preferred and why?

(b) What are the major drawbacks of the casting process and how are they overcome?

5.       (a) What is a continuous rolling mill ?what are its advantages?

(b) What is hot extrusion? In how many ways it can be performed ? discuss their merits and demerits.

6.       (a) What is a coated electrode? Sketch the arc flame due to such an electrode and explain the different functions of the coating.

(b) Explain oxyacetylene welding.

7.       Describe any two of the following welding process with their advantages and disadvantages

(a)    TIG welding

(b)   Thermite welding

(c)    Electron beam welding

8.       (a) Describe the principal of powder metallurgy and how powder is produced.

(b)   Explain the process of sintering

9.       (a) How do thermosetting plastics differ from thermoplastics?

(b) Describe with neat sketch ,the plastic processing method of injection moulding. Also write its advantages and applications.