Download AKTU B-Tech 7th Sem 2018-2019 NME 031NPL 031 Computer Aided Manufacturing Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 7th Semester (Seventh Semester) 2018-2019 NME 031NPL 031 Computer Aided Manufacturing Question Paper

Printed Pa_es: 02 Sub Code: NME031/NPL031
Paperm? RonNo.L1 1 I 1 | 1 1 1 u
B. TECH
(SEM VII) THEORY EXAMINATION 2018-19
C OMPUTER AIDED MANUFACTURING
T ime: 3 Hours T otal Marks: 100
Note: 1. Attempt all Sections. Ifrequire any missing data; then choose suitably.
SECTION A
]. Attempt all questions in brief. 2 x 10 = 20
a. What are the basic elements of Automation?
b. What is open loop and closed loop control system?
c. Differentiate between CNC and DNC machines.
d. What are the basic components of NC system?
e. How Automatic T001 Changer (ATC) works?
f. Explain any two feedback devices.
g. Write any four codes for canned cycle used in CNC pan programming.
11. What are the different types of statements in APTlanguage?
i. What are the advantages of Gloup Technology?
j. What a1e the laws of robots?
SECTJQN B
2. . Attempt any three of the following: ' 10 x 3 = 30
a. What are different types of automated manufacturing sy stem? Discuss in brief
with suitable examples
b. What ale the different types of co?ordinate system used in NC system? Explain in_
brief with suitable examples.
c. What is the difference between liner and circular interpolation? Explain each term
in the following block of information
N015 G91 G02 X50 Y62.5115 J25
Also calculate the are radius in the above sequence.
d1 Write NC part program for the compone?t On lathe as shown in ?gure 1. All
dimensions are given in mm. Diameter ?and length of raw material is 22 mm and
40 mm. Assume speed = 800 RPM and feed = 200 mm/min.
Ii
?W" T - ??1L??
(1) 30 CD 10 (D 5
?WM ____1L
" w d WM
1!
10 15 19
Figure. l
e. De?ne computer aided process planning. Discuss its advantages and
disadvantages. Also discuss under what kind of environment should generative
process planning be used instead of variant process planning?
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SECTION C
3. Attempt any one part of the following: 10 x 1 = 10
(3) De?ne ?Automation". Discuss the importance and need of automation in
manufacturing industry.
(b) Write down the shorts notes on the following:
(i) Automated Flow Lines
(ii) Automated Guided Vehicles (AGVs)
4. Attempt any one part of the following: . 10 x l = 10
(a) Discuss the factors by which accuracy and productivity of NC machines can be
increased compared to conventional machine.
(b) What are the different input media used in NC machine also discuss their
advantages and disadvantages over each other?
5. Attempt any one part of the following: 10 x 1 = 10
(a) What are the requirements of an interpolator?? Explain the working and principle
Operation ofa Digital Differential Analyzer (DDA), used for linear interpolation.
(b) What is adaptive control system?.7 Discuss the ACC and ACO types of adaptive
control with the help of suitable examples.
6. Attempt anv one part of the following: 10 x 1 = 10
(a) Illustrate the following with the help of a suitable sketch:
(i) Pan surface (ii) Dlive surface (iii) Cheek s?u1face
Also explain how these are incorporated in APT motion statement?
(b) Write geometry and motion statement in APT program of the component made of
mild steel of thickness 20 mm as Sho?wn 1n ?gure 7. All dimensions ale in mm.
50
*W?i R 25
*Mr'v.\ ? /.___
L - : "?Ah?
50
i 40 __'L
? ?23? i i .20
i.__.___?;
Figure . 2
7. Attempt any one part of the following: 10 x 1 = 10
(a) State and explain the principle objectives of FMS? Also give the area of
applications of FMS in industries with a suitable block diagram.
(b) Explain the following term related to robot:
(i) Accuracy, (ii) Work Volume, (iii) Resolution, (iv) Repeatability:
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