Enrolment No,
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-V (NEW) EXAMINATION — WINTER 2020
Subject Code:3151912 Date:01/02/2021
Subject Name:Manufacturing Technology
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
Q.1 (a) Define the following terms as used in sand mould casting 03
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- Core
- Core-Prints
- Sprue
(b) State the eight examples of products produced by foundry 04 technology.
(c) Explain various types of pattern allowances with a neat sketch. 07
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Q.2 (a) Enlist the various type of patterns used in the casting process. 03
(b) Differentiate between Pressure die casting and Permanent mould 04 casting.
(c) Describe the Shell mould casting process in terms of steps 07 involved, its advantages and disadvantages with the help of a neat sketch.
Q.3 (a) State the purpose of coating on an arc welding electrode. 03
(b) Sketch the four types of basic welding joints used in welding. 04
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(c) Discuss the TIG welding process setup with the help of a neat 07 sketch also enlist advantages, disadvantages, and applications.
Q.4 (a) Two steel plates each 1 mm thick are spot welded at a current 03 5000 A. The current flow time is 0.1 s./Calculate the heat generated in the weld zone. The effective resistance in the operation is 200 pQ.
(b) Discuss the benefits of the use‘of inert gas in the TIG welding 04 process.
(c) Sketch the three types:of flames used in the oxy-acetylene 07 welding process. Give the‘uses of each.
Q.5 (a) Define the following terms 03
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- Blooms
- Billets
- Slabs
(b) Compare the forged parts and cast parts in terms of grain size, 04 directional properties, defects, and mechanical properties.
(c) Distinguish between wire drawing and tube drawing with neat 07 sketches.
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Q.6 (a) Define the following terms:
- Forward slip 03
- Backward slip
- Neutral point
(b) For the rolling process, Derive the equation for the length of 04 deformation zone | = VRAt
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(c) Differentiate between Hot and Cold working processes. 07
Q.7 (a) State the advantages of various properties of plastic that ease 03 various plastic manufacturing processes.
(b) Define additives, Explain the function of plasticizers, catalysts, 04 and initiators.
(c) Explain the injection moulding process with a neat sketch. 07
Q.8 (a) State the significance of the superfinishing process. 03
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(b) With the help of a neat diagram explain the superfinishing 04 process.
(c) Discuss the factors that need to be considered for selecting the 07 manufacturing processes.
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