7/29/2019 Ps Mock Exam-2

1/6

Last Name:________________________

IME553 Exam II b - 2 03/20/2012 pg 1

Honesty Affirmation: By my signature here I certify that except for my textbook, I have not consulted any

other book, notes, or anyone in answering the Test questions.

SIGNATURE: ___________________________________________.

NOTE:

1. You are allowed to use only your textbookduring the test.2. Unless asked, do not give multiple answers to the same problem.3. Write legibly.4. Show all workincluding equations and values used.5. Clearly designate your final answer.6. If you think something is missing, clearly list your assumptions.

1. (6 points) If the minimum practical lead time is 4 days and the practical productionrate is 10 jobs per day and there are 45 jobs in the queue, what will you quote as a duedate (lead time) for a job?

7/29/2019 Ps Mock Exam-2

2/6

Last Name:________________________

IME553 Exam II b - 2 03/20/2012 pg 2

2. (22 points) For the table below, determine the values for the missing fields (letteredA through H) (show all work!): No need to show answers for items with an X.

Month

t

Demand

A(t)

SmoothedEstimate

F(t)

SmoothedTrend

T(t)

Forecast

f(t)1 72.00 A B -

2 80.00 75.20 0.96 C

3 85.00 79.70 2.02 76.16

4 91.00 85.43 3.13 81.72

5 96.00 D E F

6 103.00 98.54 4.92 95.57

G

H

___________ A (1)

___________ B (1)

___________ C (2)

___________ D (4)

___________ E (4)

___________ F (2)

___________ G (2)

___________ H (3)

___________ What is the forecast in period 20? (3)

7/29/2019 Ps Mock Exam-2

3/6

Last Name:________________________

IME553 Exam II b - 2 03/20/2012 pg 3

3. At Shock and Awe we make composite spars. We sell only the highest quality spars.The operations in our facility are receive (5), store (4), layup (3), and cure (2) (in that

order numbers in parenthesis are the number of machines at each workstation). Wehave an average WIP level of 380. Receivers take about 2 minutes per part. Storing

take about 5 minutes per part. Layup takes about 7 minutes per part. Curing takes

about 3 minutes. My current throughput is 200 parts per day. I work 8 hours per day.Assume NO setups. (show ALL work)

a) (5 points) What is the critical WIP for this line?

7/29/2019 Ps Mock Exam-2

4/6

Last Name:________________________

IME553 Exam II b - 2 03/20/2012 pg 4

b) (8 points) Is this a good or bad line (use data from part a)? Hint calculate thePWC and compare throughput.

7/29/2019 Ps Mock Exam-2

5/6

Last Name:________________________

IME553 Exam II b - 2 03/20/2012 pg 5

4. I make shockerjets. The last 7 periods my demand was: 25, 29, 31, 32, 35, 38, 40(weekly demands are listed).

a) (5 pts) Using moving average with a length of 4, forecast the demand forperiods 8 and 9 (weeks).

b) (5 points) If the demands in periods 8 and 9 were both 42, what would theMAD be?

7/29/2019 Ps Mock Exam-2

6/6

Last Name:________________________

IME553 Exam II b - 2 03/20/2012 pg 6

6. (5 points) For the next two tables (assume all values are correct), determine (based onMAD) which value of alpha you would prefer (show all work-calculate each MAD).

a) = 0.9

b)

= 0.7

= 0.9= 0.3

Montht

DemandA(t)

SmoothedEstimate

F(t)

SmoothedTrendT(t)

Forecastf(t) f(t) - A(t)

1 200 200.00 0.00 -

2 210 209.00 2.70 200.00 -10.00

3 220 219.17 4.94 211.70 -8.304 230 229.41 6.53 224.11 -5.89

5 230 230.59 4.93 235.94 5.94

6 250 248.55 8.84 235.52 -14.48

Sum -32.73

= 0.7= 0.3

Montht

DemandA(t)

Smoothed

EstimateF(t)

Smoothed

TrendT(t)

Forecastf(t) f(t) - A(t)

1 200 200.00 0.00 -

2 210 207.00 2.10 200.00 -10.00

3 220 216.73 4.39 209.10 -10.90

4 230 227.34 6.25 221.12 -8.88

5 230 231.08 5.50 233.59 3.59

6 250 245.97 8.32 236.58 -13.42

Sum -39.61