Rajasthan Technical University 2009 B.Tech Mechanical Engineering Machining & Machine Tools - Question Paper
Rajasthan tech. University
B.tech four sem (Main/back)
Year 2009
Machining & Machine Tools
Roll No._
Total No. of Questions : 10] (Total No. of Pages : 2
[2079]
B.Tech. I Vth Semester (Main/Back) Examination - 2009 Mechanical Engineering Machining & Machine Tools 4E2052
Time : 3 Hours Maximum Marks : 80
Min. Passing Marks : 24
Instructions to Candidates:
Attempt overall Five Questions selecting one question from each unit. All questions carry equal marks. (Schematic diagrams must be shown wherever necessary. Any data you feel missing may suitably be assumed and stated clearly. Units of quantities used/calculated must be stated clearly.)
Unit -1
1. Determine the normal force (N) and tangential force (F) on the tool face, if the rake angle (a) is 15, clip - thickness ratio is 0.383 and undeformed
chip - thickness (t,) is 0.5 mm, width of cut is 3 mm. The mean shear stress (r) ofrrork material is 280 N/iftrrt*. Assume fi=0.7. Take specific cutting pressure= 2f cotwhere <p is the1 shear plane angle. (10)
bJ/'Sketch a typical single-point iiaWve. tool and designate its angle. (6).
2. Explain the temperature zone during turning operation. Also elaborate the technique for chip tool interface temperature measurement. (16)
Unit * II
3. A 50 mm diameter bar of steel was turned at 284 r.p.m. and tool failure occurred in 10 min. The speed was changed to 232 r.p.m. and tool failure occured in 60 min.
Assuming that a tool-life cutting speed relationship exists, what cutting speed should be used to obtain a 40 min. tool life? (16)
Explain Attrition, Abrasion, Diffusion wear of tool wear, and list the factors thai affects machinability of any material. (16) 0
W.nntAio
(1)
Unit-III
5. Compare the advantage, disadvantage, limitation and application of the following process. (4x4=16)
a) Honing
b) Lapping
c) Super finishing
d) Polishing.
ft/' Differential capstan and turret . What do you understand by operational
planning and sequence of operations? (16)
What is thread chaser? What is a multiple-start thread? What are the advantages of a multi-start thread over a single-start thread? (16) (
8. Describe fully the method of manufacturing gears by hobbing process. Also list the advantage and limitation of gear hobbing process. (16)
Unit-V
Explain open & close type of explosive forming operation in detail. (16) le
10. Write down the procedure to reduce the industrial noise in a optimum way.
(16)
4E2052
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Attachment: |
| Earning: Approval pending. |
