Question Paper: CAD CAM CAE Question Paper - May 18 - Mechanical Engineering (Semester 7) - Mumbai University (MU)
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## CAD CAM CAE - May 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.

1.a. Compare Bezier and B-Spline curve
(5 marks) 00

1.b. Describe an algorithm for the removal of hidden lines.
(5 marks) 00

1.c. Describe the axis representation system used for CNC Milling machines. discuss the various interpolation methods used in NC machines.
(5 marks) 00

1.d. Explain the Socio-techno-economic aspects of CIM.
(5 marks) 00

2.a. Find the midpoint of the Bezier curve having end points P0(0,0) and P3(7,0). the other control points are P1(7,0) and P2(7,6).
(10 marks) 00

2.b. Explain industrial Robots and its application in manufacturing.
(10 marks) 00

3.a. Write a manual part program to machine the contour as shown in figure. The component is 12mm thick

(10 marks) 00

(10 marks) 00

4.a. Show that the transformation matrix for a reflection about the line y = x is equivalent to a reflection relative to the x - axis followed by an anticlockwise rotation of 90$^\circ$
(8 marks) 00

4.b. Explain the APT statements :

i. GOTO and GO/TO

ii. GODLTA and GOBACK

iii. INTOL and OUTTOL

(6 marks) 00

4.c. Explain any one velocity feedback device.
(6 marks) 00

5.a. Write a part program for the component shown in the figure assuming the raw billet size of dia. 60 mm and length 80 mm using canned cycle for rough turning followed by finished turning, keeping the finishing allowance as 0.5 mm and 0.3 mm along Z and X axis respectively.

(10 marks) 00

5.b. Plot a Hermite cubic curve having endpoints P0(1,1) and P1(7,4). The tangent vector for end P0 is defined by a line joining P0 and another point P2(8,7) whereas the tangent vector for end P1 is defined by a line joining P1 and the same point P2(8,7).
(10 marks) 00

Write a short note on any FOUR

6.a. Macros and Subroutines
(5 marks) 00

6.b. Data structures for interactive modelling.
(5 marks) 00

6.c. Steps involved in CAE
(5 marks) 00

6.d. Photolithography
(5 marks) 00

6.e. Database requirements in CIM
(5 marks) 00