Monday, August 31, 2015
Total No. of Questions: 08
M.Tech. (PE) (Sem.- 1st)
COMPUTER AIDED DESIGN AND MANUFACTURING
Subject Code: PE-505
Paper ID: [E0445]
Time: 3 Hours Max. Marks: 100
Instructions to Candidate:
1) Answer five questions out of eight questions.
2) Each question carries 20 marks.
(a) Define CAD and CAM. Discuss the role of computer in manufacturing activities.
(b) State the principle of integration between the activities of CAD and CAM.
(c) What are CAD/CAM systems evaluation criteria? Explain briefly.
(a) NC systems machines consists of three basic elements. Explain them in the light of role played by each in accomplishing the job of NC machine.
(b) A DC-servomotor is coupled directly to a lead of screw which drives the table of an NC-machine tool. A digital encoder which emits 500 pules per revolution; is mounted on the other end of the other end of the lead screw if the lead screw pitch is 5 mm and the motor rotates at 600 rpm, calculate the (a) linear velocity of the table, (b) basic length unit (i.e. increment size or bit weight) of the NC system, (c) frequency of pules transmitted by the encoder.
(a) What are micro-based CAD software’s? Discuss their application. What are the recent trends in micro-CAD system? Explain briefly.
(b) Explain microprocessor based CAD/CAM hardware components and their configuration. Give examples in support of your answer.
(a) What do you mean curves representation ? Explain wire frame models. Give schematic illustration in support of your answer.
(b) State and explain the parametric representation of analytical and synthetic curves.
(c) What is curve manipulation? Write the objectives of mathematical representation of curves and their engineering applications.
(a) State and explain the basic characteristics and objectives of the mathematical representation of surface. What are surface models? Explain any one with schematic illustration of surface model.
(b) How parametric representation is done for a surface, explain?
(c) What is surface manipulation? Write its importance.
(a) What is solid modelling? Explain the fundamentals of solid modeling. Consider an example of solid modeling based application and explain.
(b) How will you explain the boundary representation? Write the engineering applications of mathematical representation of solids.
(a) Explain the transformation of geometric models.
(b) How are mappings of geometric models done? Explain with example.
(c) Discuss about the inverse transmission and projections of geometric models.
Q8) Write brief notes on the followings:
(a) Assembly modeling.
(b) Product distribution trends in reference to the microprocessor based CAD/CAM.
(c) Software development and efficient use of CAD/CAM software.
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