EBK PRINCIPLES OF OPERATIONS MANAGEMENT
11th Edition
ISBN: 9780135175859
Author: Munson
Publisher: VST
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 9, Problem 13P
Illinois Furniture, Inc., produces all types of office furniture. The “Executive Secretary” is a chair that has been designed using ergonomics to provide comfort during long work hours. The chair sells for $130. There are 480 minutes available during the day, and the average daily demand has been 50 chairs. There are eight tasks:
a) Draw a precedence diagram of this operation.
b) What is the cycle time for this operation?
c) What is the theoretical minimum number of workstations?
d) Assign tasks to workstations.
e) What is the idle time per cycle?
f) How much total idle time is present in an 8-hour shift?
g) What is the efficiency of the assembly line, given your answer in (d)?
a)
Expert Solution
Summary Introduction
To draw: The precedence diagram.
Answer to Problem 13P
Explanation of Solution
Given information:
| Task | Time (minutes) | Immediate predecessors |
| A | 4 | - |
| B | 7 | - |
| C | 6 | A, B |
| D | 5 | C |
| E | 6 | D |
| F | 7 | E |
| G | 8 | E |
| H | 6 | F, G |
| Total | 49 |
- The chair is sold for $130.
- Number of minutes available = 480 / day.
- Average daily demand is 50 chairs.
Precedence diagram:
b)
Expert Solution
Summary Introduction
To determine: The cycle time.
Introduction:
Cycle time:
Cycle time is the total time taken to complete an unit of work from the beginning of the process to the end of the process.
Answer to Problem 13P
The cycle time is 9.6 minutes / unit.
Explanation of Solution
Given information:
| Task | Time (minutes) | Immediate predecessors |
| A | 4 | - |
| B | 7 | - |
| C | 6 | A, B |
| D | 5 | C |
| E | 6 | D |
| F | 7 | E |
| G | 8 | E |
| H | 6 | F, G |
| Total | 49 |
- The chair is sold for $130.
- Number of minutes available = 480 / day.
- Average daily demand is 50 chairs.
Formula to calculate cycle time:
Calculation of cycle time:
The cycle time is 9.6 minutes / unit.
c)
Expert Solution
Summary Introduction
To determine: The theoretical minimum number of workstations.
Answer to Problem 13P
The theoretical minimum number of workstations is 6 workstations.
Explanation of Solution
Given information:
| Task | Time (minutes) | Immediate predecessors |
| A | 4 | - |
| B | 7 | - |
| C | 6 | A, B |
| D | 5 | C |
| E | 6 | D |
| F | 7 | E |
| G | 8 | E |
| H | 6 | F, G |
| Total | 49 |
- The chair is sold for $130.
- Number of minutes available = 480 / day.
- Average daily demand is 50 chairs.
Formula to calculate theoretical minimum number of workstations:
Calculation of theoretical minimum number of workstations:
The theoretical minimum number of workstations is 6 workstations.
d)
Expert Solution
Summary Introduction
To assign: The different tasks to different workstations.
Explanation of Solution
Assignment of different tasks to different workstations:
Task A is assigned to station 1. Task B is assigned to station 2. Task C is assigned to station 3. Task D is assigned to station 4. Task E is assigned to station 5. Task G is assigned to station 6. Task F is assigned to station 7. Task H is assigned to station 8.
e)
Expert Solution
Summary Introduction
To determine: The idle time per cycle.
Answer to Problem 13P
The idle time is 15 minutes / cycle.
Explanation of Solution
Given information:
| Task | Time (minutes) | Immediate predecessors |
| A | 4 | - |
| B | 7 | - |
| C | 6 | A, B |
| D | 5 | C |
| E | 6 | D |
| F | 7 | E |
| G | 8 | E |
| H | 6 | F, G |
| Total | 49 |
- The chair is sold for $130.
- Number of minutes available = 480 / day.
- Average daily demand is 50 chairs.
Calculation of idle time per cycle:
The idle time is 15 minutes / cycle.
f)
Expert Solution
Summary Introduction
To determine: The total idle time present in an 8 hour shift.
Answer to Problem 13P
The total idle time present in an 8 hour shift is 15 hours.
Explanation of Solution
Given information:
| Task | Time (minutes) | Immediate predecessors |
| A | 4 | - |
| B | 7 | - |
| C | 6 | A, B |
| D | 5 | C |
| E | 6 | D |
| F | 7 | E |
| G | 8 | E |
| H | 6 | F, G |
| Total | 49 |
- The chair is sold for $130.
- Number of minutes available = 480 / day.
- Average daily demand is 50 chairs.
Calculation of total idle time present in an 8 hour shift:
There are 480 minutes available in a day. The longest operation time is 8 minutes. Therefore the number of cycles in a day is given by:
The total idle time is calculated by multiplying the number of cycles with the total idle time per cycle.
The total idle time present in an 8 hour shift is 15 hours.
g)
Expert Solution
Summary Introduction
To determine: The efficiency.
Introduction:
Efficiency:
Efficiency is the measure of what is actually produced as opposed to what can be theoretically produced with the same amount of resources.
Answer to Problem 13P
The efficiency is 76.6%.
Explanation of Solution
Given information:
| Task | Time (minutes) | Immediate predecessors |
| A | 4 | - |
| B | 7 | - |
| C | 6 | A, B |
| D | 5 | C |
| E | 6 | D |
| F | 7 | E |
| G | 8 | E |
| H | 6 | F, G |
| Total | 49 |
- The chair is sold for $130.
- Number of minutes available = 480 / day.
- Average daily demand is 50 chairs.
Formula to calculate efficiency:
Calculation of efficiency:
The efficiency is 76.6%
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Vikiki Furniture, Inc. produces all types of office furniture. The "Executive Secretary" is a sofa-bed that has been designed using ergonomics to provide comfort during long work hours. The sofa-bed sells for $138. There are 580 minutes available during the day, and the average daily demand has been 65 items. There are eight tasks: Task performance time (min) task must follow task listed A 4 -- B 7 -- C 6 A, B D 5 C E 6 D F 7 E G 8 E H 6 F, G Total 49 min What is the Cycle time for this operation?
Manufacturing Company uses FIFO method of accumulating costs in a two-department process. Materials are introduced at the inception of the process except for a special material which is added in department 2 at 60% completion as to overhead. Inspection is done at the end of the process in both departments. Production data for Department 2 are given below:
In process, beginning, (80% labor, 70% overhead)2,000 Transferred in 14,900 In process, ending (40% labor, 20% overhead) 3,000 Normal spoilage 200 Abnormal spoilage (found at 30% completion as to laborand 15% as to overhead due to internal failure) 400 Cost data for the month:In process beginning:Transferred in 15,020 Special materials 1,900 Direct labor 4,388 Overhead 11,044 Current costs:Transferred in 137,080 Special materials 14,030 Direct labor 46,000 Overhead 113,564
The cost of units transferred to finished goods is?The cost of spoilage charged to revenue is?
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.…
Chapter 9 Solutions
EBK PRINCIPLES OF OPERATIONS MANAGEMENT
Ch. 9 - Prob. 1EDCh. 9 - Prob. 1DQCh. 9 - Prob. 2DQCh. 9 - Prob. 3DQCh. 9 - Prob. 4DQCh. 9 - Prob. 5DQCh. 9 - Prob. 6DQCh. 9 - Prob. 7DQCh. 9 - Prob. 8DQCh. 9 - Prob. 9DQ
Ch. 9 - Prob. 10DQCh. 9 - Prob. 11DQCh. 9 - Prob. 12DQCh. 9 - Prob. 13DQCh. 9 - Prob. 14DQCh. 9 - Prob. 15DQCh. 9 - Prob. 16DQCh. 9 - Prob. 17DQCh. 9 - Prob. 18DQCh. 9 - Prob. 1PCh. 9 - Prob. 2PCh. 9 - Prob. 3PCh. 9 - Roy Creasey Enterprises, a machine shop, is...Ch. 9 - Adam Munson Manufacturing, in Gainesville,...Ch. 9 - Prob. 6PCh. 9 - Prob. 7PCh. 9 - Prob. 8PCh. 9 - Prob. 9PCh. 9 - Six processes are to be laid out in six areas...Ch. 9 - Stanford Rosenberg Computing wants to establish an...Ch. 9 - Illinois Furniture, Inc., produces all types of...Ch. 9 - Prob. 14PCh. 9 - The Action Toy Company has decided to manufacture...Ch. 9 - Prob. 16PCh. 9 - Prob. 17PCh. 9 - Prob. 18PCh. 9 - Prob. 19PCh. 9 - Prob. 20PCh. 9 - Prob. 21PCh. 9 - Prob. 22PCh. 9 - Prob. 23PCh. 9 - Prob. 25PCh. 9 - Prob. 26PCh. 9 - Prob. 27PCh. 9 - Prob. 1CSCh. 9 - Prob. 2CSCh. 9 - Henry Coupe, the manager of a metropolitan branch...Ch. 9 - Prob. 4CSCh. 9 - Prob. 1.1VCCh. 9 - Prob. 1.2VCCh. 9 - Prob. 1.3VCCh. 9 - Prob. 1.4VCCh. 9 - Prob. 1.5VCCh. 9 - Prob. 1.6VCCh. 9 - Prob. 2.1VCCh. 9 - Prob. 2.2VCCh. 9 - Prob. 2.3VC
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- 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.…arrow_forwardIllinois Furniture, Inc., produces all types of officefurniture. The "Executive Secretary" is a chair that has beendesigned using ergonomics to provide comfort during long workhours. The chair sells for $130. There are 480 minutes availableduring the day, and the average daily demand has been 50 chairs.There are eight tasks: a) Draw a precedence diagram of this operation. •b) What is the cycle time for this operation?c) What is the theoretical minimum number of workstations?d) Assign tasks to workstations.e) What is the idle time per cycle?f) How much total idle time is present in an 8-hour shift?g) What is the efficiency of the assembly line, given your answer in (d)?arrow_forwardRock View Restaurant is a new fast-food restaurant chain. The Operations Manager has dividedits normal drive-through service process into the following tasks: Task Description Task time in seconds Predecessors A Take Order 25 none B Received Payment 20 A C Gather Drinks 35 A D Gather Food 32 A E Put food etc. in bag 25 C,D F 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 of147 seconds per customer so only 25.5 cars can be served. Rock View Restaurant wants toincrease its drive-through capacity to 60 cars per hour by forming a multi-window line. i. Draw the precedence diagram to represent the process at Rock View Restaurant.ii. Calculate the cycle time in seconds.iii. Calculate the minimum number of windows that Rock View Restaurant will need toserve 60 cars per hour.arrow_forward
- Rock View Restaurant is a new fast-food restaurant chain. The Operations Manager has dividedits normal drive-through service process into the following tasks: Task Description Task time in seconds Predecessors A Take Order 25 none B Received Payment 20 A C Gather Drinks 35 A D Gather Food 32 A E Put food etc. in bag 25 C,D F 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 of147 seconds per customer so only 25.5 cars can be served. Rock View Restaurant wants toincrease its drive-through capacity to 60 cars per hour by forming a multi-window line. Using the LOT heuristic, assign the tasks to the windows to produce the desiredservice rate making sure that the precedence relationship is maintained.Calculate the efficiency of the newly design process.arrow_forwardThe 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).arrow_forwardTailwind, Inc., produces high-quality but expensive training shoes for runners. The Tailwind shoe, which sells for $210, contains both gas- and liquid-filled compartments to provide more stability and better protection against knee, foot, and back injuries. Manufacturing the shoes requires 10 separate tasks. There are 400 minutes available for manufacturing the shoes in the plant each day. Daily demand is 60. The information for the tasks is as follows: Performance Time Task (in minutes) 1 Н ABCDEFGH Task Must Follow This Task C, D ABB GAFG 324-325- E, H 25 312 | Required: a. Draw the precedence diagram showing the task precedence and their times b. Determine the cycle time associated with the rate of output required. c. What is the theoretical minimum number of work stations required to satisfy this output rate? d. Allocate the tasks to work stations taking into consideration the precedence requirements and using the LOT rule to break ties between feasible tasks. e. What is the…arrow_forward
- Tailwind, Inc., produces high-quality but expensive training shoes for runners. The Tailwindshoe, which sells for $210, contains both gas- and liquid-filled compartments to provide morestability and better protection against knee, foot, and back injuries. Manufacturing the shoesrequires 10 separate tasks. There are 400 minutes available for manufacturing the shoes inthe plant each day. Daily demand is 60. The information for the tasks is as follows: Task Performance Time (In minutes) Task Must Follow This task A 1 ___ B 3 A C 2 B D 4 B E 1 C.D F 3 A G 2 F H 5 G I 1 E,H J 3/25 I 1. What is the theoretical minimum number of work stations required to satisfy this output rate? 2. Allocate the tasks to work stations taking into consideration the precedence requirements and usingthe LOT rule to break ties between feasible tasks.arrow_forwardHi! I need a little help with D. I can't figure out how to calculate the efficiency. Can you explain it to me?arrow_forwardIllinois Furniture, Inc., produces all types of office furniture. The "Executive Secretary" is a chair that has been designed using ergonomics to provide comfort during long work hours. The chair sells for $130. There are 480 minutes available during the day, and the average daily demand has been 50 chairs. There are eight tasks: Task Performance Time (mins) Task Must Follow Task Listed Below A 4 − B 6 − C 6 A, B D 5 C E 7 D F 6 E G 7 E H 7 F, G This exercise only contains parts b, c, d, e, f, and g. The cycle time for the production of a chair = 9.69. minutes (round your response to two decimal places). The theoretical minimum number of workstations=5 (round your response up to the next whole number). d) The assignment of tasks to workstations should be: (Hint:…arrow_forward
- K Canine Kennels Company (CKC) manufactures two different types of dog chew toys (A and B, sold in 1,000-count boxes) that are manufactured and assembled on three different workstations (W, X, and Y) using a small-batch process (see the figure below). Batch setup times are negligible. The flowchart denotes the path each product follows through the manufacturing process, and each product's price, demand per week, and processing times per unit are indicated as well. Purchased parts and raw materials consumed during production are represented by inverted triangles. CKC can make and sell up to the limit of its demand per week; no penalties are incurred for not being able to meet all the demand. Each workstation is staffed by a worker who is dedicated to work on that workstation alone and is paid $6 per hour. Total labor costs per week are fixed. Variable overhead costs are $3,500/week. The plant operates one 8-hour shift per day, or 40 hours/week. Product A $2 Step 1 Station W (11 min) Raw…arrow_forwardWhat is the bottleneck of the process is which worker ?arrow_forwardDraw a sequence diagram on this scenario. Consider an e commerce website, the customer will search for the items either by category, by price, by color or by size. the customer will add the selected items to the shopping cart. He/she can either continue shopping or can perform checkout. On checkout bill/invoice will be generated and the customer will enter personal information including email, phone and address; will choose cash on delivery option or card payment. If card payment selected, he/she will enter the card information. The bank object will validate the card, if validated the required amount will be deducted and the item will be dispatched to the provided address in both cases (COD/ valid card payment).arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,
Practical Management Science
Operations Management
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:Cengage,
Inventory Management | Concepts, Examples and Solved Problems; Author: Dr. Bharatendra Rai;https://www.youtube.com/watch?v=2n9NLZTIlz8;License: Standard YouTube License, CC-BY