Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Chapter 10, Problem 21P
Summary Introduction
To determine: The normal time, allowance factor, and standard time for the operation
Introduction: Time study is the basis that helps set the standard time; it would time a sample of the performance of the worker.
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Susan Cottenden clocked the observed time for welding a part onto truck doors at 5.3 minutes. The performance rating of the worker timed was estimated at I 05%. Find the normal time for this operation. Note: According to the local union contract, each welder isallowed 3 mi nutes of personal time per hour and 2 minutes offatigue time per hour. Further, there should be an average delayallowance of I minute per hour. Compute the allowance factorand then find the standard time for the welding activity.
Susan Cottenden clocked the observed time forwelding a part onto truck doors at 5.3 minutes. The performance rating of the worker timed was estimated at 105%.Find the normal time for this operation.Note: According to the local union contract, each welder isallowed 3 minutes of personal time per hour and 2 minutesof fatigue time per hour. Further, there should be an averagedelay allowance of 1 minute per hour. Compute the allowance factor and then find the standard time for the weldingactivity.
An analyst has timed a metal cutting operation for 60 bikes. The average time per cycle was 10.30 minutes, and the standard deviation was 1:20 minutes for a worker with a performance rating of 120 percent. Assume an allowance of 16 percent of job time. Find the standard time for this operation.
Chapter 10 Solutions
Principles Of Operations Management
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- The snapback timing method was used to obtain the average times and performance ratings for work elements in a manual repetitive task. (See table below). All elements are worker-controlled and were performance rated at 80%. Element e is an irregular element performed every five cycles. A 15% allowance for personal time, fatigue, and delays isapplied to the cycle. Determine (a) the normal time and (b) the standard time for this cycle. If the worker’s performance during actual production is 120% on all manual elements for 7 actual hours worked on an 8-hour shift, (c) how many units will be producedarrow_forwardFrom a time study, the worker’s average observed time for a particular task is shown to be 5.6 minutes. The analyst feels the worker was performing their task, on average, about 25% faster than normal. What would be the resulting standard time assuming a 20% allowance for fatigue and personal needs?arrow_forwardA worker-machine operation was found to involve 3.3 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker's time-averaged 1.9 minutes per cycle, and the worker was given a rating of 120% (machine rating is 100%). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 12% of work time, determine the standard time for this job. Hints: you should consider both machine time and machine time together. Also, Allowance only applies to the man, not a machine.arrow_forward
- A worker-machine operation was found to involve 3.3 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker’s time averaged 1.9 minutes per cycle, and the worker was given a rating of 120 percent (machine rating is 100 percent). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 12 percent of work time, determine the standard time for this job.arrow_forwardSusan Cottenden clocked the observed time for welding a part onto truck doors at 5.5 minutos. The performance rating of the worker imed was estimated at 115% The nomal time for this process -Ominutes (round your response to two decimal places). According to the local union contract, each welder is allowed 4 minutes of personal time per hour and 1 minute of fatigue time per hour. Further, there should be an average delay allowance of 2 minutes per hour. The allowance factor for the welding operation = (enter your response as a percentage rounded to twa decimal places). The standard time for this process minutes (round your response to two decimal places).arrow_forwardA job was timed for 60 cycles and had an average of 1.25 minutes per piece. The performance rating was 95 percent, and workday allowances are 9 percent. Determine each of the following: a. Observed time. (Round your answer to 2 decimal place.) Observed time minutes b. Normal time. (Round your answer to 2 decimal places.) Normal time minutes c. Standard time. (Round your answer to 2 decimal places.) Standard time minutesarrow_forward
- 5. The manager of Asombrado Bounty Office, Charles Badillo, estimates his employees are idle 25%of the time. With that problem, how many work samples are needed to consider within 3%accuracy and have 95.45% confidence level. 6. At ASP Micro Manufacturing, Inc. workers press semiconductor into predrilled slots on printed-circuit boards. Determine the normal time of the operation in seconds. The elemental motions for normal time used by the company are as follows:• Reach 6 inches for semiconductors 10.5 TMU• Grasp the semiconductors 8.0 TMU• Move semiconductor to printed-circuit board 9.5 TMU• Position semiconductor 20.1 TMU• Press semiconductor into slots 20.3 TMU• Move board aside 15.8 TMU 7. The semiconductor used in Costin Calculator has 5 components with the consistency of 90%, 95%,98%, 90%, and 99%, respectively. How reliable is one product of calculator?arrow_forwardYou recorded an observed time of 1 minute per unit of production. If the performance rating of the observed worker was 120 and 5% PNA was provided, what is the standard time per unit?arrow_forwardYou want to know the standard time of a welding process. The analyst has obtained the followingi information: average timed time - 1.30 minutes rhythm assessment - 110 fixed supplements - 5% variable supplements - 2% Determine the standard time, in minutes, of the welding process: a) 143 min b) 145 min c) 150 min d) 153 minarrow_forward
- Suppose you want to set a time standard for the baker making her specialty, square donuts. A work sampling study of her on "donut day" yielded the following results: Time spent (working and idle) : 320 minutes Number of donuts produced : 5,000 pieces Working time : 280 minutes Performance rating : 125% Allowances : 10% What is the standard time per donut given the allowance is added to its normal time?arrow_forwardcompany from your understanding. 3) Calculate the standard time for an operation from the following data. Average observed time for manual elements = 4 0 minutes Average auto cycle time = 3 minutes Rating on a scale of 100 = 90% Personal & other allowances = 15% of basic timearrow_forwardA time study was made of an existing job to develop new time standards. A worker was observed for 45 minutes.During that period, 30 units were produced. The analyst rated the worker as performing at a 90 percent performance rate. Allowances in the firm for rest and personal time are 12 percent. a. What is the normal time for the task?b. What is the standard time for the task?c. If the worker produced 300 units in an eight-hour day, what would be the day’s pay if the basic rate was $6 per hour and the premium payment system paid on a 100 percent basis?arrow_forward
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