Veer Narmad South Gujarat University 2010-3rd Sem B.E Machanical Technology - 2 ( ) ( Mech.) - Question Paper
B. E. II (Sem. Ill) (Mech.) Examination
May/June - 2010
Mechanical Technology
RN-6267
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Instruction : (1) |
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(2) Attempt all questions. (3) Figures to the right indicate full marks. (4) Draw neat sketches wherever required. |
Time : 3 Hours] [Total Marks : 100
1 (a) Answer the following : 10
(i) Why the section of sprue reduces downwards?
(ii) Give any two applications of sand casting process.
(iii) Give two limitations of true centrifugal casting process.
(iv) Define casting yield.
(v) Name different types of casting defects.
(b) Draw a neat sketch of a cupola furnace and explain 5 each zone of it.
(c) Calculate the permeability number of sand if it takes 5 1 min 25 seconds to pass 2000 cm3 of air at pressure
of 5 g/cm1 through the standard sample.
3 Answer any three from following : 15
(a) Explain different types of cores.
(b) Write in brief about testing moulding sand properties.
(c) Modulus method of riser design.
(d) Explain different pattern materials.
(e) Explain fluidity and fluidity test.
4 (a) Answer the following : 10
(i) Explain the difference between hot working and cold working.
(ii) Differentiate soldering and brazing process.
(iii) Which process is used for production of gas cyhnders and washers?
(iv) What is 'angle of bite' in rolling process.
(v) Explain 'Trimming' process in sheet metal working.
(b) Explain forging defects. 7
(c) Draw the figure of rolling process. 3
5 (a) State merits and demerits of hot working process. 7
(b) Explain the parameters which control the quality of 8
joint in welding process.
OR
(b) Explain 3-High and 4-High rolling mill with neat 8
sketch.
6 Answer any three : 3x5=15
(i) Brazing process
(ii) Resistance welding
(iii) Welding defects
(iv) Indirect extrusion
(v) Plasma arc welding.
RN-6267] 2 [ 200 ]
Answer the following :
(a) Sketch the common gating system. Label all its 8 elements. Give their functions.
(b) Explain the method of determining moisture content 7 in the moulding sand.
OR
(b) Describe investment casting process. 7
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Attachment: |
| Earning: Approval pending. |
