Principles of Operations Management: Sustainability and Supply Chain Management (10th Edition)
Principles of Operations Management: Sustainability and Supply Chain Management (10th Edition)
10th Edition
ISBN: 9780134181981
Author: Jay Heizer, Barry Render, Chuck Munson
Publisher: PEARSON
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Chapter 15, Problem 2DQ
Summary Introduction

To determine: The four criteria for scheduling.

Introduction: Scheduling is the process of controlling and arranging the workloads of the production process using an optimized method. It is used to plan and allocate human resources and machinery.

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Question 1 The longest time period you can go without updating a schedule is no more than 3 weeks. True False Question 2 0 Network Loop is the process by which relationships between activities are created. Activities are linked finish-to-start start-to-start, finish -to -finish, or start-to-finish and can include lag or lead times. True False Question 3 A constraint is a restriction imposed on the start date, finish date or other aspect of an activity. Constraints are used to prescribe limitations on the schedule based on external conditions such as contractual restrictions or imposed float requirements. True False
QUESTION 4 (SCHEDULING: JOHNSON'S RULE) The following schedule was prepared by the production manager of Marymount Metal Shop: Determine a schedule that will result in the earliest completion of all jobs on this list. CUTTING POLISHING Job ABCDEFG (ii) (iii) (iv) Start 0 2 6 11 15 17 20 Finish 2 6 11 15 17 20 21 Start 2615232 11 20 24 Finish 5 9 13 20 23 24 28 What is the optimal sequence? Draw the time-phased chart. What is the total completion time? What is the total idle time at Polishing work centre?
Q4 An arsenal has six tasks waiting to be processed and the processing time and due completion time for each task is shown in the table below. Assuming that the tasks given are in the order of the table: Mission A B CA D< E F Processing time (days)< 6 12< 14 24 10< 4 Due for completion (days)< 22< 14 30 184 25 34< Requirements 1. Sort the jobs according to the first come first served rule and the shortest processing time rule and calculate the average completion time, average number of jobs in the system, average delay time and equipment utilization respectively and explain which is the better sorting method.
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