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CAD CAM Question Paper - Dec 18 - Mechanical Engineering (Semester 7) - Jawaharlal Nehru Technological University (JNTUH)
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CAD CAM - Dec 18
Mechanical Engineering (Semester 7)
Total marks: 75
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
What is parametric CAD system
(2 marks)
00
1.b.
Differentiate between implicit and explicit functions
(3 marks)
00
1.c.
What is meant by surface patch?
(2 marks)
00
1.d.
What are the Boolean operation used in solid modelling?
(3 marks)
00
1.e.
Define APT.
(2 marks)
00
1.f.
What are the different elements of NC system?
(3 marks)
00
1.g
Define variant approach
(2 marks)
00
1.h.
What is the need of group technology?
(3 marks)
00
1.i.
Give some advantages by the implementation of CIM.
(2 marks)
00
1.j.
How SME (Society of Manufacturing Engineers) defined CIM?
(3 marks)
00
Part B
2.a.
Briefly describe the types of storage devices used in computers.
(5 marks)
00
2.b.
Explain the concepts of parametric and non-parametric curves with examples
(5 marks)
00
Or
3.a.
Differentiate the terms wire frame, surface and solid models, along with their benefits
(5 marks)
00
3.b
Write the properties of Bezier and B-Spline curves.
(5 marks)
00
4.a.
What are the different types of geometric relations? Why would you use them in 3D
geometric modeling?
(5 marks)
00
4.b.
What is Hermite cubic spline curve? Derive a general characteristic equation for cubic
spline curve.
(5 marks)
00
Or
5.a.
Find the equation of a Bezier curve which is defined by four control points as (80,30,0),
(100,100,0),(200,100,0) and (250,30,0).
(5 marks)
00
5.b.
Sketch the geometric parameters required to create these surface operations:
(5 marks)
00
i) Tabulated cylinder
ii) Revolve
iii) Sweep
iv) Loft.
6.a.
What are the main features of CNC Machine Tool? Write any 10 G-codes and 10
M-codes with a short description.
(5 marks)
00
6.b.
Discuss the advantages of computer assisted part programming over manual part
programming.
(5 marks)
00
Or
7.a.
Explain the difference between CNC and DNC along with neat sketches.
(5 marks)
00
7.b.
Write NC part program for the part shown in the below figure. All the dimensions are in
mm only.
(5 marks)
00
8.a.
Define and explain the principle of GT (Group Technology) in manufacturing
(5 marks)
00
8.b.
What is the philosophy of JIT (Just in Time)? Give any simple example.
(5 marks)
00
Or
9.a.
What are the OUTPUTS of MRP? Explain their uses.
(5 marks)
00
9.b.
Explain the difficulties in traditional process planning.
(5 marks)
00
10.a.
Describe the following with respect to CIM.
(5 marks)
00
i) Process monitoring and control
ii) Quality control.
10.b.
How does Lean manufacturing differ from Flexible manufacturing system? Explain
(5 marks)
00
Or
11.a.
How do you evaluate the performance of FMS (Flexible Manufacturing System).
(5 marks)
00
11.b.
Explain the following terms:
(5 marks)
00
i) Online inspection
ii) Off line inspection
iii) In-Process inspection
iv) Post-process inspection.
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