Question Paper: CAD CAM Question Paper - Jun 18 - Mechanical Engineering (Semester 7) - Jawaharlal Nehru Technological University (JNTUH)

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## CAD CAM - Jun 18

### Mechanical Engineering (Semester 7)

Total marks: 80

Total time: 3 Hours
INSTRUCTIONS

(1) Question 1 is compulsory.

(2) Attempt any **three** from the remaining questions.

(3) Draw neat diagrams wherever necessary.

PART_A (25 MARKS)

**1.a.**List out input and output devices of CAD.

**1.b.**What are the importance of continuity curves?

**1.c.**What is subdividing?

**1.d.**Write the parametric equation of ruled surface.

**1.e.**What do you understand the M and G function?

**1.f.**Compare the NC, CNC and DNC.

**1.g.**What is the need of part analysis?

**1.h.**What is composite part? Give an example of your own?

**1.i.**Define the FMS.

**1.j.**what is the role of computers in quality control?

PART_B (50 MARKS)

**2.a.**Compare the traditional and CAD/CAM of product cycle.

**2.b.**What are the application of computer in design?

OR

**3.a.**Differentiate between the interpolation and approximation of curves.

**3.b.**Drive the parametric equation of hermite cubic curve? list out the characteristics.

**4.a.**Define bezier surface? Explain various characteristic of this surface.

**4.b.**A circle with radius for unit having centre located at point (20, 10, 0) is rotated about the x-axis by an angle of 2Π to obtain an surface revolution. Calculate the surface point at ∅=Π and ∅=Π.

OR

**5.a.**Enlist and explain with different Boolean operation in solid modelling.

**5.b.**explain the cell decomposition and spatial occupancy enumeration.

**6.a.**How NC machines are classified? Explain them with neat sketches.

**6.b.**With neat sketches, write down the neat procedure for manual part programming.

OR

**7.a.**Explain the concept of adaptive control of NC machines.

**7.b.**List out various type of G and M codes function.

**8.a.**Discuss advantage and disadvantage of OPITZ code system.

**8.b.**what is the production Flow Analysis? Discuss the various steps involved in PFA.

**9.a.**How do you overcome the difficulties in traditional process planning of adopting method.

**9.b.**Explain the machine cell design.

**10.**Discuss the following types of layouts in the design of FMS. a) Circular layer b) Linear layers c) Low player d) Free layout.

OR

**11.**Explain following inception system: a) On-line inspection b) Off-line inspection c) In-process inspection d) Process inspection.