Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Chapter 14, Problem 1.1Q
Summary Introduction
To find:The sequence in which B Construction should complete the repair projects of six road.
Introduction:TheJohnson rule is a technique of
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Ed is planning to build a treehouse as a present for his son's upcoming 10th birthday. The
details for each task are as follows:
DE F G
AD C,E F
12
Task
A
B
Preceding Task
Duration (day) | 12
A
B
10
12
5
Cost (RM)
50 140 120 60 70
80
60
(a) Obtain the following:
• The number of days it will take for Ed to finish building the treehouse.
• Which tasks are cannot be delayed at all without delaying the whole project.
• The total cost of building the treehouse.
(b) Due to illness, Ed has to begin building the treehouse later than planned. He reckons that
he must reduce the build duration by 3 days to complete the treehouse by his son's birthday.
He has determined the crash cost and crash time for each task as follows:
Task
А В С
DE F G
Crash Time (day) | 12 8
9
8 10 5
6
Crash Cost (RM) | 50 170 180 70 95 80 60
Obtain the following:
• All tasks that are crashed and by how much.
• The new total cost for building the treehouse.
To complete the rotor assembly for an experimental spacecraft, Gilbert has laid out nine major activities involved. These activities have been labelled A to I in the table below, which also shows their estimated completion times (in weeks) and their immediate predecessors.
EVENTS AND ACTIVITIES FOR ROTOR ASSEMBLY
ACTIVITIES
TIMES (IN WEEKS)
PRECEDING EVENT
A
M
B
A
1
2
3
-
B
2
3
4
A
C
4
5
6
A
D
8
9
10
A
E
2
5
8
B
F
4
5
6
B, C
G
1
2
3
F, D
H
1
3
5
E, F
I
2
4
6
H, G
Key: A is optimist time, M is the most likely time and B is the pessimistic time.
a) Calculate the expected time for each activity
b) Draw a Gantt Chart from the same information above
c) State the critical path and the maximum number of weeks the project will take to be completed.
d) Discuss the pros and cons of using the Gantt chart as a planning and scheduling tool?
Cyclone Appliances has developed a new European-style convection oven that will be made on an assembly line. The schedule requires 80 ovens in an 8-hour day. The assembly includes seven tasks. The table below indicates the performance time and the sequence requirements for each task.
Task
Performance Time (minutes)
Task must follow Task listed below
A
1
B
2
A
C
3
B
D
2
B
E
4
C, D
F
1
E
G
2
F
i) What is the cycle time for this assembly operation? (3 marks)
ii) What is the theoretical minimum number of workstations? (3 marks)
iii) Draw the precedence diagram. (Please note that diagram can be drawn with the use of Microsoft shapes) (4 marks)
b)
iv) Briefly explain what "slotting" is. (4 marks)
v) State the ethical issues which might arise with regard to slotting? (6 marks)
Chapter 14 Solutions
Practical Operations Management
Ch. 14 - Prob. 1DQCh. 14 - Prob. 2DQCh. 14 - Prob. 3DQCh. 14 - Prob. 4DQCh. 14 - Prob. 5DQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 6P
Ch. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 18PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 26PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 1.1QCh. 14 - Prob. 1.2QCh. 14 - Prob. 1.3QCh. 14 - Prob. 1.4Q
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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
- Draw Gantt Chart for this Scheduling Projectarrow_forwardRegarding section D with assigning the workstations: How would Task F go first if it could not be completed with Task D? Usint LOT. regardless of the time each took, doesn't one still have to bare in mind the predecessors? I would assume Tasks A and B would be Workstation 1, considering that 45 plus 20 seconds is less than the cycle time and factoring in the fact that C only requires A to be completed, hence why the workstation should start at A followed by C.arrow_forwardHow do scheduling activities differ for projects, mass production, and process industries?arrow_forward
- Find out optimum sequencearrow_forwardCreate a schedule for this house to be completed within the time frame Jan 4 to April 4. The following persons were selected to do various jobs. John-The guy responsible for the roughing, dry wall, and plastering Tom -clearing the construction site Jerry-Pouring the foundation and Masonry Craig-Plumber Mike-Electrician Steven- Tiling Joe-Carpenter The 10 Steps to Build a New Home Are: Prepare construction site and pour the foundation Construct rough framing Complete rough plumbing, electrical and HVAC Install insulation Complete drywall and interior textures; start exterior finishes Finish interior trim; install exterior driveways and walkways Install hard-surface flooring and countertops, and complete exterior grading Finish mechanical trims; install bathroom fixtures Install mirrors, shower doors and finish flooring, and finish exterior landscaping Final walkthrough with the builder Make sure to mark milestones.arrow_forwardCompute the earliest starting time and earliest finishing time for each activity in the diagram shown in Figure 17.5.arrow_forward
- 3) to final assembly for an important customer order. Currently, all eight jobs are in department X and must be routed to department Y after processing. The processing times (in days) for each job in each department follow: The machine shop of Reliable Manufacturing has to schedule eight jobs that are to be sent Dept/Job Dept. X Dept. Y A B C D E F G H 2 4 7 5 4 10 3 3 8 2 6 5 Develop two schedules for operations in both departments. For your first schedule, use the SPT priority rule (based on X). Your second schedule should be based on Johnson's Rule. Compare the two schedules using average flow time, makespan, and average WIP inventory. Use a Gantt chart to display your schedules (i.e. a timeline).arrow_forwardK Amelio Rodríguez Computing wants to establish an assembly line for producing a new product, the Personal Digital Assistant (PDA). The tasks, task times, and immediate predecessors for the tasks are as follows: Task A B C D E Amelio's goal is to produce 180 PDAs per hour. a) The cycle time for the production of a PDA = Time (sec) 12 14 8 5 20 Immediate Predecessor I A A B, C D seconds (round your response to two decimal places). riarrow_forwardA project consist of 5 activities A,B,C,D,E with ES, EF, LS and LF of A (0, 6, 9, 15); B (0, 7, 0, 7); C (6, 13, 15, 22); D (7, 13, 7, 13); E (13, 22, 13, 22). Normal Time (in month), Crash time (in month), Normal cost (in million Rp), Crash cost (in million Rp) from each activity are A (6, 4, 20, 24); B (7, 5, 30, 35); C (7, 6, 10, 13); D (6, 4, 20, 26); E (9, 8, 88, 90) a. What activities are in the critical path? How long is the project duration? b. If we want to crash the project for 2 months, what activities need to be crashed? How much additional cost required?arrow_forward
- A small maintenance project consists of the following jobs, whose precedence relationships are given below.arrow_forwardEntriken Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Dick Entriken, president of Entriken Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. Dick is contemplating the construction of a machine that could harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the accompanying table. ---------------------------------------------- Activity Immediate Time (weeks) predecessor --------------------------------------------- A - 6 B - 5 C A 3 D A 2 E…arrow_forwardEntriken Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Dick Entriken, president of Entriken Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. Dick is contemplating the construction of a machine that could harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the accompanying table. ---------------------------------------------- Activity Immediate Time (weeks) predecessor --------------------------------------------- A - 6 B - 5 C A 3 D A 2 E…arrow_forward
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