Winter 2014 Manufacturing Engineering-III Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
Diploma Engineering - SEMESTER–V • Examination – WINTER • 2014
Subject Code: 3351903  Date: 02-12-2014
Subject Name: Manufacturing Engineering - III
Time: 10:30 am - 01:00 pm  Total Marks: 70

Instructions:
1.  Attempt all questions.
2.  Make suitable assumptions wherever necessary.
3.  Figures to the right indicate full marks.
4.  English version is considered to be Authentic.

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Q.1    Answer any seven out of ten.  14

1.  Define: (i) Pitch (ii) Depth of thread (iii) Crest (iv) Root

2.  List different types of threads.

3.  Why gears are finished?

4.  State merits and demerits of gear hobbling processes.

5.  Give list of materials which are used for MEMS manufacturing.

6.  Classify non-conventional machining methods.

7.  What are the limitations of broaching processes?

8.  Difference between special purpose machine and Automatic machine.

9.  Explain the terms: (i) Trueing (ii) Dressing

10.  Explain the meaning of the code “WA 100 M5 V 25”.

Q.2  (a)  Explain the need of manufacturing engineering III.  03

OR

(a)  Explain cutting speed, feed and depth of cut.  03

(b)  Write short note of surface grinding.  03

OR

(b)  Explain centre less grinding operation with neat sketch.   03

(c)  Explain the term glazing. List reasons for it.  04

OR

(c)  State different grinding operations and explain about cylindrical grinding.  04

(d)  List various super finishing processes and explain lapping operation.  04

OR

(d)  State the need of balancing a grinding wheel and explain the method of balancing a grinding wheel.   04

Q.3  (a)  Explain the working principle of electric discharge machining with sketch.  03

OR

(a)  Explain Abrasive Jet Machining with neat sketch.  03

(b)  Write short note on Laser Beam Machining.  03

OR

(b)  Write short note on Ultrasonic Machining.  03

(c)  Difference between conventional and non-conventional machining methods.  04

OR

(c)  Write short note on Electro Chemical machining.  04

(d)  Explain the need of Micro Electro Mechanical Systems (MEMS).  04

OR

(d)  State the reasons for development of non-conventional machining processes.  04

Q.4  (a)  State atleast five function of Jig Boring machine.  03

OR

(a)  Write short note on Jig Boring machine.  03

(b)  Classify broach and explain its working principle with figure.  04

OR

(b)  Explain boring process with its working principle.  04

(c)  Explain Double Column Jig Boring machine with neat sketch.  07

Q.5  (a)  Explain principle of generating and forming processes with sketch.  04

(b)  List gear finishing methods and explain gear shaving.  04

(c)  List thread production methods and explain thread milling processes.  03

(d)  Write short note on thread rolling.  03

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