Veer Narmad South Gujarat University 2010-3rd Sem B.E Manufacturing Process - 1 - 2 ( ) ( Mech.) - Question Paper

RN-8129

B. E. - II (Sem. Ill) (Mechancial) Examination May/June - 2010 Manufacturing Process - I

Time : Hours]    [Total Marks : 100

Instructions :

(1)

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Fillup strictly the details of signs on your answer book.

Name of the Examination :

B. E. - 2 (Sem. 3) (Mechanical)

Name of the Subject:

Manufacturing Process - 1

-Subject Code No.

8 1 2 9

-Section No. (1,2,.....)

(2)    Attempt all the questions.

(3)    Use separate answer books for each section.

(4)    Draw neat sketch whenever necessary.

(5)    Answer suitable data if necessary.

SECTION - I

1 Answer any ten of the following :    20

(i)    With the help of neat sketch. Show various elements of 'twist drill'.

(ii)    Which are the desirable properties of lathe bed material.

(iii)    What is a 'chuck'? Why is it used? Which are the various types of chuck?

(iv)    What is a tool signature? State its importance.

(v)    Explain vertical boring m/c.

(vi)    What is tool life? Name any three tool materials and cutting fluids.

(vii)    Which are the methods of tapes turning? Explain any one in brief.

(viii)    Write a brief note on "Chip Breaker'.

(ix)    Classification of boring m/c.

(x)    What is a BUE? When is it obtained during machining?

(xi)    Explain the size of the lathe machine.

(xii) Explain following operations :

(a)    Shoulder turning

(b)    Spot facing

(c)    Reaming

(d)    Counter boring.

2 Answer any three of the following :    18

(a) Calculate the machining time for given job.

(b)    Derive an expression for 'set over'.

(c)    Determine the change gears to be set between stud and lead screw of lathe without feed box to cut the following thread pitches

(i)    1.25 mm pitch 3 start.

(ii)    2.5 mm pitch single start.

The lathe has a 3 mm pitch lead screw and is supplied with a change gear set from 20 to 100 teeth in steps of 4 teeth.

(d)    Calculate maching time for given job.

All dimensions one is "mm" Cutting speed = 2.5 m / min. Feed = 0.5 mm/rev

3 Answer any three of the following :    12

(a)    Alignment test of boring m/c.

(b)    Factors affecting tool life

(c)    Explain radial drilling machine

(d)    Cutting fluids and its importance

(e)    Apron mechanism.

Answer the following :    10

(i)    With the help of neat sketch show the various elements of plain milling cutter.

(ii)    What is meant by glazing and loading of grinding machine?

(iii)    Differentiate pull and push broaching.

(iv)    State the machining applications of slotting machine.

(v)    State application of sawing machine.

Answer the following :

(i)    Differentiate between face milling and end    5 milling operations.

(ii)    Write down the steps for machining vertical    5 surface in shaping machine.

5 Answer the following :

(a) Explain with neat sketch crank and slotted link mechanism of shaping machine. 8 (b) Explain Internal Grinding machine. OR 7 (a) Give the advantages and disadvantages of broaching machine. 8 (b) Differentiate between up milling and down milling with a neat sketch. 7 Explain any three of the following : 15 (i) Write a short note on grinding wheel marking system. (ii) Write a short note on slotter machine. (iii) Explain the component of planner machine with neat sketch. (iv) Enlist various types of milling operation. Explain plain milling. (v) Explain circular sawing machine.

RN-8129]    3    [ 300 ]

Attachment: veer-narmad-south-gujarat-university-2010-b-e-28358-1.pdf

Earning:   Approval pending.