Homework | Operations Management homework help

  

1. Consider a two-station production line with single machines. Jobs arrive to the first station at an average rate of 5 per hour with a squared coefficient of variation equal to 1.96. Effective processing times average 0.125 hours with a squared coefficient of variation equal to 0.81. 

a) What is the first station’s utilization?

b) What is the squared coefficient of variation of the arrivals to the second station?

c) If an identical second machine is added to the first station, do you expect the SCV of arrivals to the second station to increase or decrease? Why? (Start by thinking about how utilization will change.)

2. Suppose jobs arrive at a single-machine workstation at a rate of 20 per hour and the average process time is 2.5 minutes.

a) What is the utilization of the machine?

b) Suppose that the inter-arrival and process times are such that and

i) What is the average time a job spends at the station (i.e. waiting plus process time)?

ii) What is the average number of jobs at the station?

c) Now suppose instead that the SCV of process times is 4, with a mean process time of 2.5 minutes (unchanged).

i) What is the average time a job spends at the station?

ii) What is the average number of jobs at the station?

3. Consider a workstation with 11 machines, each requiring one hour of process time per job with an SCV of 5. Each machine costs $10,000. Jobs arrive at a rate of 10 per hour with SCV equal to 1 and they must be filled. Management has specified a maximum allowable average response time (i.e. time a job spends at the station) of 2 hours. Currently it is just over 3 hours (check this). Analyze the following options and determine which is best for reducing average response time.

a) Perform more preventive maintenance at a cost of $8000 (over lifetime of the machines). The effect of this on tr and tf is that ultimately ce2 is reduced to 1.

b) Add another identical machine to the workstation at a cost of $10,000. 

c)  Modify the existing machines to make them faster without changing the SCV, at a cost of $8500. The modified machines would have te = 0.96 hours and ce2 = 5.

You may use the VUT spreadsheet used for the example in the video to help you in comparing the options.

Order a unique copy of this paper
(550 words)

Approximate price: $22

Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

We value our customers and so we ensure that what we do is 100% original..
With us you are guaranteed of quality work done by our qualified experts.Your information and everything that you do with us is kept completely confidential.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

The Product ordered is guaranteed to be original. Orders are checked by the most advanced anti-plagiarism software in the market to assure that the Product is 100% original. The Company has a zero tolerance policy for plagiarism.

Read more

Free-revision policy

The Free Revision policy is a courtesy service that the Company provides to help ensure Customer’s total satisfaction with the completed Order. To receive free revision the Company requires that the Customer provide the request within fourteen (14) days from the first completion date and within a period of thirty (30) days for dissertations.

Read more

Privacy policy

The Company is committed to protect the privacy of the Customer and it will never resell or share any of Customer’s personal information, including credit card data, with any third party. All the online transactions are processed through the secure and reliable online payment systems.

Read more

Fair-cooperation guarantee

By placing an order with us, you agree to the service we provide. We will endear to do all that it takes to deliver a comprehensive paper as per your requirements. We also count on your cooperation to ensure that we deliver on this mandate.

Read more

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency