Download GTU BE/B.Tech 2019 Winter 8th Sem Old 181903 Production Technology Question Paper

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Seat No.: Enrolment No.

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VIII (Old) EXAMINATION - WINTER 2019
Subject Code: 181903 Date: 25/11/2019
Subject Name: Production Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Define Non-conventional machining? Why do we need these processes? Give classification of the Non conventional processes? [07]
(b) Draw neat sketch of single point cutting tool indicating its complete geometry. [07]

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Q.2 (a) Draw Merchant’s force diagram. Derive the equations for frictional force, normal reaction, shear force and normal force. [07]
(b) In orthogonal cutting, the feed of tool is 1.25 mm/rev and chip thickness after cutting is 2 mm. The tool bit has a rake angle of 10°. If shear strength = 600 N/mm², Width of cut = 10 mm, Cutting speed = 30 m/min, Co-efficient of friction = 0.9, Determine the (1) Chip thickness ratio (2) Shear angle (3) Shear force (4) Friction angle (5) Cutting force and (6) Horse power at cutting tool. [07]

OR

(b) The following equation for tool life is given for a turning operation,
V T^0.13 f^0.77 d^0.37 = C

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A 60 min tool life was obtained while cutting at V =30 m/min, f= 0.3 mm/rev and d = 2.5mm. Determine the changes in tool-life if the cutting speed, feed and depth of cut are increased by 20% individually and also taken together. [07]

Q.3 (a) Enlist various thread manufacturing processes? Explain with neat sketch. [07]
(b) Compare gear Hobbing and gear Shaping processes with neat diagrams. [07]

OR

(b) Differentiate between Jigs and Fixture. Enlist different types of clamping devices. Explain any two with neat sketches. [07]

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Q.4 (a) List various principles of location and explain 3-2-1 Principal of Location with neat sketches. [07]
(b) Enlist methods to measure cutting temperature and explain any two. [07]

OR

(b) Explain various machine tool structures, based on rigidity. [07]

Q.5 (a) Explain significance of center of pressure in design of press tools. How is it calculated? [07]

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(b) Describe the common bending operations performed on presses. [07]

OR

(b) What are guide-ways? What are the principal requirements of them? Enlist various types of guide ways used in machine tools. Explain any two in detail. [07]

Q.6 (a) What is difference between a Capstan & Turret lathe? Describe in brief with the help of suitable sketch. [07]
(b) Explain working principle of EDM. What are main process parameters? State advantages, disadvantages and applications of EDM. [07]

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OR

(b) Explain principle of Ultrasonic machining with help of neat diagram. State its advantages and application. [07]