Exam 2015, Answers rn
Operations and Logistics Management (EBB068A05)
Rijksuniversiteit Groningen
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1
Solution to Example Intermediary Exam
1D
SCM is integrating the flow of materials, information and customers between the organization and its suppliers and customers.
2A
Operations Strategy is about making a prioritization between the five key performance measures (Cost, Quality, Speed, Dependability and Flexibility). Answers B and D are not getting into these KPIs and are therefore wrong. Clearly, for INPHONE Flexibility is more important than Cost.
3C
Arrival rate is 10 jobs per hour, capacity is 12 jobs per hour, i., utilization is 10/12.
4D
Clearly throughput is a capacity which should not be confused with the throughput time. Throughput is determined by the bottleneck. Here the bottleneck is Coating which can handle 6 jobs per hour.
5B
See Slide 32 of Lecture 2
6B
See Slide 38 of Lecture 3
7A
Balking: upon arrival customer examines queue and decides to leave right away Reneging: Customer enters queue and at certain point reaches the conclusion that (s)he leaves the system.
8C
See Slide 43 of Lecture 3
9D
Arrival rate is 12 customers per hour. Throughput time is 5+15+10 = 30 minutes = 0 hour. According to Little’s equation it holds that the WIP is equal to 12 x 0 = 6.
10D
Arrival rate = 60/7 = 8. Activity A capacity = 3 x (60/26) = 6. Activity B capacity = 60/8 = 7. Activity C capacity = 2 x (60/18) = 6.
2
11C
Design capacity = 120 hours/week x 1200 tablets/hour = 144,000 tablets/week Planned breaks etc are 12 hours per week, i., Effective capacity = (120 – 12) x 1200 = 129, Actual output = 116, Utilization = Actual output / design capacity = 116,640/144,000 = 81% Efficiency = Actual output / Effective capacity = 116,640/129,600 = 90%.
12C
Arrival rate is 12 jobs per hour At Activity 1, 9 jobs can be done in 15 + (9 x 5) = 60 minutes, i., 9 jobs per hour At Activity 2, at 2a the capacity is 4 jobs/hour and at 2b it is 6 jobs per hour, i., in total 10 jobs per hour The bottleneck is Activity 1 and the throughput is 9 jobs per hour. Again, throughput is a capacity which should not be confused with the throughput time.
13B
M/M/
λ = 60/17; μ = 60/
1.
()
Wq
14D
M/M/
λ = 60/ μ = 11 per 3 hours = 11/3 per hour utilization = λ/μ = 0.
15A λ=1/2 = 0 units/minute and μ=3 units/minute M/M/1 model
( )
Wq = 0 minutes
16A
λ= 60/6 = 10 customers/hour μ = 60/4 = 15 customers/hour M/D/1 model
2 ( )
2
Lq =0 customers
17B
Exam 2015, Answers rn
Vak: Operations and Logistics Management (EBB068A05)
Universiteit: Rijksuniversiteit Groningen
