RTU 2016 Question Paper Semester IV Automobile Engineering Machining and Machine Tools

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N 4E4L42
+
F{ B.Tech. IV-Sem (Main & Back) Exam; June'July 2016
+
II]
Automobile Engineering
4AF.'3A Machining & Machine Tools
+ AE, ME

Time: 3 Hours Maximum Marks: 80
Min. Passing Marks (Main & Back): 26
Min. Passing Marks (Old Back): 24
Instructions to Candidate s :'

Attempt any ft.ve questions, selecting one question from each unit. All
Questions carry equal marks. Schematic diagrams
must be shown
wherever necessary. Any data you feel missing suitably be assumed and
stated clearlY.
(Jnrts of quantities used./ calculated must be stated clearly.

Use of following supporting material is permitted during examination'

(Mentioned in form N o.205 )
2.

UNIT.I
Q.1 (a) Classified the metal removal processes. Sketch a single point cutting tool and
explain the complete geometry of it' t8l

(b) Identify the forces involved in a cutting operation. Show them on merchant circle
diagram. which force contributes to the power required? t8l

OR
Explain the various types of Chips. t4l
Q.1 (a)
(b) Differentiate orthogonal cutting and oblique cutting. In an orthogonal cutting
process, the following observations were made: Depth of cut = 0.25mm,
width of

cut = 4mm, chip thickness ratio = 0.45, cutting velocity = 4Om/min. Cutting
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force = 1150N, thrust force = 140N, rake angle = 10o. Determine Shear plane
angle, friction angle and resultant force and force component parallel to shear
plane. Also calculate power consumed during the cutting operations. lI21

UNIT.II
which affects
Q.2 (a) What is machinability index? What are the parameters
machinability. t6l

(b) Discuss the different mechanism of tool wear in machining. 16l

(c) Mention the requirement of cutting fluids. I4l

OR

e.2 (a) Explain Taylor's tool life equation. A generalized Taylor's tool life equation was
obtained for HSS tool;

ar- C
' - T0.13 f 0.6 do.3

A 60 min tool life was obtained using the following parameters V = 4Om/min,
f = 0.25 mm/rev, d = 2mm. Compute the tool life if cutting speed feed and depth
of cut are increased by 25Vo rndividually. t10l

(b) Explain the different types of tool materials and their applications t6l

UNIT.III
Explain various parts of capstan & turret lathe machines' t8l
Q.3 (a)
(b) Describe the construction & working of Milling Machine' t8l

OR
,Twist drill'? Make a neat sketch of a twist drill and show its different
Q.3 (a) What is a
parts on it. t6l

(b) Explain with the help of neat sketch the working principle of a shaper' t6l

(c) Compare the merits & demerits of Broaching with other machining operations.[4]

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TTNIT.IV

Q.4 (a) What materials are used in manufacturing of grinding wheels? What properties
they impart to the wheel? t6l

(b) Mention the marking system of grinding wheel having the specification:
4.60K5V r8. t6l

(c) Differentiate Honing Process and super finishing operation. t4l

OR

Q.4 (a) What are the different methods of thread manufacturing? Fxplain any two
methods. t4l

(b) Write short notes of following ll21
(i) Honing
(ii) Lapping
(iii) Polishing
(iv) Buffing
UNIT-V
Q.5 (a) Elaborate the various gear finishing methods. t8l

(b) Explain 'Gear hobbing process'. Also mention advantages and limitations of it.[8]

OR

Q.5 (a) Differentiate gear generation method and gear forming method. Explain gear
shaping process. t8l

(b) What are the different high velocity methods? Explain any two methods. t8l

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