College of Engineering
Department: Mechanical Engineering
Subject: Computer aided manufacturing (ME 415)
Assignment 1 Marks: 10
Date of examination: 06/03/2014
Q.N1. [4 points] Work Elements on precedence diagram for a electrical appliance are summarized
below. Carry out the balancing of line using the Largest Candidate Rule (LCR) and rank position
weight (RPW). The demand is 400 products per day. The working time per day can be taken as 400
minutes.
How many work stations are needed?
What is the efficiency of assembly line?
QN2. [3 points] There are 5 jobs to be processed on 3 machines in a flow shop. The process times
for all jobs at each machine are given in the accompanying table. i) If random sequence J5-J3-J2-J4J1 is opted, calculate the total time taken to finish all jobs (make span time).
ii) Find out the lower bounds on each machines. Based on lower bounds generate the alternate
sequence of jobs for optimal make span time.
Jobs
Machine
M1
M2
M3
3 hrs
3
6
5
11
3
4
3
2
4
1
8
5
3
7
Machines
Job1
J2
J3
J4
J5
Q 3. [3 points]Find the sequence of jobs in question 2 using Gupta’s method. What is sequence of jobs
and total make span time.