Operations Management
Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Chapter 9, Problem 14P

The Action Toy Company has decided to manufacture a new train set, the production of which is broken into six steps The demand for the train is 4,800 units per 40-hour workweek:

TASK PERFORMANCE TIME (SEC) PREDECESSORS
A 20 None
B 30 A
C 15 A
D 15 A
E 10 B, C
F 30 D, E
  1. a. Draw a precedence diagram of this operation.
  2. b. Given the demand, what is the cycle time for this operation?
  3. c. What is the theoretical minimum number of workstations?
  4. d. Assign tasks to workstations
  5. e. How much total idle time is present each cycle?
  6. f. What is the efficiency of the assembly line with five stations? With six stations?
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The three-station work cell illustrated in the figure below has a product that must go through one of the two machines at station 1 (they are parallel) before proceeding to station 2. Q Capacity: 30 units/hr Station 1 Machine A Station 1 Machine B Capacity: 30 units/hr Station 2 Capacity: 10 units/hr a) The bottleneck time of the system is b) What is the bottleneck station of this work cell c) What is the throughput time? Station 3 Capacity: 6 units/hr minutes per unit (enter your response as a whole number).
Rock View Restaurant is a new fast food restaurant chain. The Operations Manager has dividedits normal drive-through service process into the following tasks:Tasks                                    Description           Task           Time(InSeconds)PredecessorsA                                         Take order                25            NoneB                                  Receive payment            20              AC                                     Gather drinks               35              AD                                     Gather food                  32              AE                                 Put food etc. in bag           25            C,DF                                  Give food to customer     10             B,E Currently, Rock View Restaurant has a single window with one person who takes the order, gather the food, collects the money and gives the food to the customer. This takes an average of 147 seconds per customer so only 25.5 cars can be served.…
Rock View Restaurant is a new fast food restaurant chain. The Operations Manager has dividedits normal drive-through service process into the following tasks:Tasks                                    Description           Task           Time(InSeconds)PredecessorsA                                         Take order                25            NoneB                                  Receive payment            20              AC                                     Gather drinks               35              AD                                     Gather food                  32              AE                                 Put food etc. in bag           25            C,DF                                  Give food to customer     10             B,E Currently, Rock View Restaurant has a single window with one person who takes the order, gather the food, collects the money and gives the food to the customer. This takes an average of 147 seconds per customer so only 25.5 cars can be served.…

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Operations Management

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