# QSO 600 Operations Management

Problem Questions

1. Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last five samples are shown in the table. Draw and R Chart and an x-bar chart. Based on the charts, is the process under control? (20 Points)

Observations

Sample

1

2

3

4

5

1

73.5

70.8

72.2

73.6

71.0

2

71.3

71.0

73.1

72.7

72.2

3

70.0

72.6

71.9

72.4

73.3

4

71.1

70.6

70.3

74.2

73.6

5

70.8

70.7

70.7

73.5

71.1

Answer 1:

2. A professor records the number of students who complain each week throughout the semester. If the class size is forty students, what are 3-sigma control limits for this class? Construct a control p-chart and interpret the data. Is the process in control? (20 points)

Week number

Complaints

1

5

2

2

3

7

4

1

5

3

6

2

7

8

8

1

9

3

10

5

11

4

12

6

13

3

14

1

15

4

Answer 2:

3. A department store chain is designing a layout for a new store. The store manager wants to provide as much convenience as possible for her customers. Based on historical data, the number of trips between departments per hour is given in the following closeness matrix. A block plan showing a preliminary layout is also shown.

.gif”>

.gif”> Closeness Factors (Trips per hour)

1/O 2/S 3/H 4/T 5/A 6/E

.gif”>

1. Office Supplies (O) — 40 100 50 20 10

2. Sporting Goods (S) — 100 80 60 80

3. Hardware (H) — 70 100 50

4. Toys (T) — 70 90

5. Automotive (A) — 60

6. Electronics (E) —

OFFICE SUPPLIES

.gif”>

.gif”>SPORTING GOODS

3. HARDWARE

4. TOYS

5. AUTOMOTIVE

6.ELECTRONICS

Customer travel between departments is restricted to the aisles shown in the block plan as dotted lines.

CALCULATIONS TABLE:

Dept. Pair

Closeness Factor (w)

Original Distance (dO)

w´ dO

Revision #1 Distance (d1)

w´ d1

1 2

1 3

1 4

1 5

1 6

2 3

2 4

2 5

2 6

3 4

3 5

3 6

4 5

4 6

5 6

TOTAL

Complete the calculations and fill in the table above. Based on the table above answer the following questions.

a) What is the total expected weighted-distance score between Office Supplies and Hardware? (4 points)

b) What is the total weighted-distance score between Hardware and Toys? (4 points)

c) What is the total weighted-distance score for the entire store? (4 points)

d) A suggestion has been made to switch Hardware and Automotive. What would the total weighted-distance score for the entire store if these two departments were switched? (4 points)

e) Based on your calculations, would you recommend that Hardware and Automotive be switched? (4 points)

Answer 3:

4. Balance the assembly line for the tasks contained in the table. The desired output is 240 units per day. Available production time per day is 480 minutes.

Work Element

Time (Sec.)

Immediate Predecessor(s)

A

40

—

B

45

—

C

55

A

D

55

B

E

65

B

F

40

C,D

G

25

D,E

a) What is the desired Cycle time in seconds? (4 points)

b) What is the theoretical minimum number of stations? (4 points)

c) Use trial and error to work out a solution in the table below. Your efficiency should be at least 90%. (10 Points)

Station

Candidates

Choice

Work-Element

Time (Sec)

Cumulative Time (Sec)

Idle Time

d) Calculate the efficiency of your solution. (2 points)

Answer 4:

5. A manufacturers research and development center must expand by building a new facility. The search has been narrowed to five locations, all of which are acceptable to management. The assessment of these sites is being made on the basis of the five subjective location factors that follow. Management has agreed to use a five-point scale (Excellent = 5, and Poor = 1) to quantify and compare their subjective opinions about the relative goodness of the sites. The weight reflects the importance of each factor in the decision.

Locations

Factor

Weight

A

B

C

D

E

Labor climate

0.30

4

2

1

4

2

Proximity to markets

0.30

5

3

3

4

4

Quality of life

0.15

1

3

2

1

5

Proximity to suppliers

0.15

2

5

3

4

3

Taxes

0.10

4

4

4

1

3

Calculate the weighted score for each alternative. Which location would you recommend?(15 points)

Answer 5:

6. Complete the following MPS Record (15 points)

Lot Size

130

Lead Time

1

Quantity on Hand

45

1

2

3

4

5

6

7

8

9

10

Forecast

25

25

25

25

50

50

50

50

40

20

Customer Orders (booked)

30

20

5

8

2

Projected On-Hand Inventory

MPS Quantity

MPS start

Available to Promise Inventory

Answer 6:

7. Use the bill of materials and inventory records to determine the quantity of purchased items necessary to assemble 20 end items if the manufacturer uses lot-for-lot ordering. There are no end items currently on hand, and none of the components have any scheduled receipts. (20 points)

Component

On-hand

Component

On-hand

A

5

D

15

B

75

E

3

C

10

F

20

.gif”>

Answer 7:

8. Use the table below to answer the following questions.

.gif”>

a) Use the information in the Table above, what is the throughput time for the process, assuming that the Call Center is always busy and has customers waiting to be processed? (5 points)

b) Use the information in Table above, what is the process bottleneck? (5 points)

c) Use the information in Table above, what is the 8-hour capacity for the process? (5 points)

d) Use the information in Table above, where would you expect customer wait times to occur? (5 points)

Answer 8:

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