Homework 7

1. The following activities are part of a project to be scheduled using CPM:

 

Activity	Immediate Predecessor	Time (Weeks)
A	–	6
B	A	3
C	A	7
D	C	2
E	B, D	4
F	D	3
G	E, F	7

 

1. Draw the network.
2. What is the critical path?
3. How many weeks will it take to complete the project?
4. How much slack does activity B have?

 

 

2. Schedule the following activities using CPM:

 

 

Activity	Immediate Predecessor	Time (Weeks)
A	–	1
B	A	4
C	A	3
D	B	2
E	C. D	5
F	D	2
G	F	2
H	E, G	3

 

1. Draw the network.
2. What is the critical path?
3. How many weeks will it take to complete the project?
4. Which activities have slack, and how much?

 

 

3. Following are the process flow sequences for three products: A, B, and C. There are two bottleneck operations—on the first leg and fourth leg—marked with an X. Boxes represent processes, which may be either machine or manual. Suggest the location of the drum, buffer, and ropes.

 

4. The accompanying figure shows a production network model with the parts and processing sequences. State clearly on the figure (1) where you would place inventory; (2) where you would perform inspection; and (3) where you would emphasize high-quality output.
5. The following production flow shows Parts E, I, and N; Subassembly O; and the final assembly for Product P.

A to B to C to D to E

F to G to H to I

J to K to L to M to N

E and I to O

N and O to P

B involves a bottleneck operation, and M involves a CCR.

 

1. Draw the process flow.
2. Where would you locate buffer inventories?
3. Where would you place inspection points?
4. Where would you stress the importance of quality production?