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Seat No.: Enrolment No.:
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER -III • EXAMINATION SUMMER 2018
Subject Code: 331905 Date:30-04 -2018
Subject Name: Manufacturing Engineering-1
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Each question carry equal marks (14 marks)
Q.1

Define recrystallization temperature. List various factors on which recrystallization temperature of metal depends.
07





Give difference between Hot Rolling Process and Cold Rolling Process with neat sketch.
07



Q.2

List various types of rolling mills and explain three high rolling mill with neat sketch.
07





List different types of drawing operations and the defects occur in drawing process with their causes.
07



OR

Define extrusion. Sketch and explain Indirect extrusion process.
07



Q.3

Define pattern allowance. Name various pattern allowances giving purpose of each.
07





List name of pattern materials. Describe cope and drag pattern with neat sketch.
07



OR
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Q.3

What are essential properties of a moulding sand? State the effect of each properties on casting.
07





Explain the different zones with a sketch of Cupola furnace.
07



Q.4

Explain Submerged arc welding with advantages and disadvantages.
07





Write short note on MIG arc welding.
07



OR
Q.4

Explain the principle of Thermit welding with neat sketch.
07





State step by step procedure for adhesive joint.
07



Q.5

Define following terms:
Elasticity Ductility Toughness Strength Malleability
Hardness Brittleness
07







Give difference between Hot Working process and Cold Working process.
07



OR
Q.5

Draw neat sketch of mechanical press showing name of its parts and explain functions of any two parts.
07





State difference between soldering and brazing.
07