College of Engineering
Department: Mechanical Engineering
Course : Computer aided Manufacturing (ME 415)
Duration: 45 Minutes.
Attempt all the questions:
Quiz:
Date: March 4, 2014
Marks : 10
QN1. For the three types of production systems, Job shop, Batch and Mass production, mark the level
of requirement as ‘H’ for high, ‘M’ for Medium and ‘L’ for Low against the criterion given below. [1]
Criterion
Production Quantity
(H, M, and L)
Job variety
Labor Skill
Equipment
Job Shop
o
o
o
o
o
o
o
o
o
o
o
o
Batch Production
H
M
L
H
M
L
H
M
L
General
Special purpose
o
o
o
o
o
o
o
o
o
o
o
o
Mass production
H
M
L
H
M
L
H
M
L
General
Special purpose
o
o
o
o
o
o
o
o
o
o
o
o
H
M
L
H
M
L
H
M
L
General
Special purpose
b. Define the followings terms: Processing function, material handling, inspection and test
[2]
QN2. Write brief about the followings: Fixed automation, Flexible automation, and Programmable
automation
[2]
QN3. There are 4 jobs to be processed on 4 machines in a flow shop. The process times for all jobs at
each machine are given in the accompanying table.
[1+2]
Find out the lower bounds on each machines.
And find out the sequence of jobs for optimal
make span time.
Job1
J2
J3
J4
Machine M1
2 hrs
1
6
4
M2
3
4
3
2
M3
1
8
5
3
M4
5
5
2
7
QN4. There are 3 jobs arrived in the system.
The sequencing of jobs on machine ‘B’ has to be done based on rules. The current time is 10hr. [2]
Job
Arrival to system Arrival at B
Due Date
Operations and timings
1
5 Hrs
10 Hrs
30 hrs
B-5hrs  A 2 hrs D 5 hrs
2
4
5
25
D-3 hrsB-3 hrsC-2 hrsA-1 hr
3
0
5
20
E-4 hrsB-4 hrs
Based on slack per remaining operations, least work remaining find the sequence at machine B.