1. The following table shows orders to be processed at a machine.

a. Determine the processing sequence using each of these priority rules: (1) CR, (2) MST, (3) SPT, (4) EDD.

B. Determine the performance of each rule CR,MST,SPT ,EDD using (1) average flow time, (2) average days late. (Round the final answers to 1 decimal place.)

c.	Is one rule superior to the others? YES OR NO

2. A production process uses a two-step operation. Tomorrows work will consist of seven orders as shown below.

a. Determine a job sequence that will minimize the total time required to fill the orders (i.e., the make-span).

CHOOSE

a. B-A-G-F-D-C

b. C-D-F-B-A-G-E

c. A-B-C-D-E-F-G

d. G-D-E-A-B-C-F

B. Determine the make-span. (Round the final answer to 1 decimal place.)

make up spam------ hours.

3. Given the operation times in the two-work-centre flow shop below:

a. Develop a job sequence that minimizes total idle time at Work Centre 2. Choose

a. A-B-C-E-F-D

b. B-A-C-E-F-D

c. C-A-B-E-F-D

d. D-A-C-F-B-D

b. Construct a load Gantt chart for the activities at the two work centres, and determine work centre 2s idle time.

idle time_____ minitues?

Job A B D E Processing Time (days) 8 10 5 11 9 Due Date (days) 20 18 25 17 35 Time (hours) Order A B RUA14 U Step 1 Step 2 1.20 1.40 0.90 1.30 2.00 0.80 1.70 1.50 1.60 1.80 2.20 1.75 1.30 1.40 Job Times (minutes) E Work Centre 1 Work Centre 2 A 20 27 B 16 30 43 51 D 60 12 F 42 24 35 28 5