Mechanical Engineering (Semester 6)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) Define automation. Explain Different types of automation system with examples(10 marks)
1 (b) Explain the terms: i) Utilization; ii) Manufacturing lead time(4 marks)
1 (c) The average part produced in a certain batch manufacturing plant must be processed through an average of 6, machines. There are 20 new batches parts launched each week. Data for the average problem are as follows
Average operations time=6 minute
Average set-up time=5 hours
Average non-operation time=10 hours
Average batch size=25 parts
There are 18 machines in the plant. The plant operates an average of 70 hours/week. Determine : i) Manufacturing lead time; ii) Plant utilization(6 marks)
2 (a) What are the symbol used in an authorised flow line?(5 marks)
2 (b) Sketch and explain in the following work part transfer mechanism
i) Liner walking beam
ii) Geneva wheel
iii) Dial indexing machine.(15 marks)
3 (a) In a eleven ( 11) station transverse line the probability of station breakdowns will occur for a given work part is equal To 0.02. This probability is same for all the 11 stations. Determine the frequency line stop/cycle on this flow line using upper bound approach and lower bound approach with an average Production time -1.6 min. Determine production rate.(10 marks)
3 (b) What is the purpose of buffer storage? State its effectiveness in automated flow line(6 marks)
3 (c) Write a short note on partial automation(4 marks)
4 (a) A project has the following tasks. Its immediate predecessor and the task times are given below. Using largest candidate rule balance the line and determine :
i) Number of work stations ii) Balance delay of line iii) Line efficiency. Take T0-1min.
|
Tasks |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
|
Preceded by |
- |
- |
1 |
1,2 |
2 |
3 |
3 |
3,4 |
6,7,8 |
5,8 |
9,10 |
11 |
|
Te(min) |
0.2 |
0.4 |
0.7 |
0.1 |
0.3 |
0.11 |
0.32 |
0.6 |
0.27 |
0.38 |
0.5 |
0.12 |
(12 marks)
4 (b) Explain the following terms in line balancing:
i) Minimum rotational work element.
ii) Total work content time
iii) Cycle time
iv) Line efficiency.(8 marks)
5 (a) Explain the design for automated assembly system.(7 marks)
5 (b) Explain with a neat sketch the elements of part feeding device(8 marks)
5 (c) List the applications of AGV's(5 marks)
6 (a) With a neat sketch explain retrieval 'CAPP' system(10 marks)
6 (b) What is a material requirement planning? Explain various inputs and outputs to MRP system.(10 marks)
7 (a) Describe the advantages, disadvantages and applications of CNC machine tools(10 marks)
7 (b) Explain the Fundamental steps involved in development of part Programming for milling and turning.(10 marks)
8 (a) Explain With sketches the common robot configuration(10 marks)
8 (b) Explain the following
i) Work volume
ii) Precision of movement
iii) End efforts in robots
iv) Repeatability(10 marks)
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teamques10
★ 68k
sagarkolekar
★ 11k