Question

1. Product A has an MTBF of 90000 hours and an MTTR of 5300 hours. Product B has an MTBF of 29000 hours and an MTTR of 1900 hours. What is the Systems Availability for each product?

a. None of these are correct

b. A = 94.43; B = 93.85 .

c. A = 94.43; B = 1.07

d. A = 1.06; B = 93.85

e. A= 1.06; B= 1.07

2.

The difference between Six Sigma and Design for Six Sigma is:

		Design for Six Sigma is for products and Six Sigma is only for quality issues
		Design and Verify.
		None of these
		There is no difference

3.

The AEB Company is looking at tools for controlling projects. From the customer perspective what project control tool should they use?

		Gantt or CPM
		Gantt or PERT
		Gantt Chart

Need all three.

Answer 1

1. b. A = 94.43; B = 93.85 .

System Availability = MTBF / (MTBF + MTTR)

System availability for product A = 90000 / (90000+5300)

= 94.43

System availability for product A = 29000 / (29000+1900)

= 93.85

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2. none of these

Design For Six Sigma (DFSS) is used for design of new processes/products or complete re-design of existing processes, whereas Six Sigma is used for improvement in existing processes and quality control of products.

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3. Gantt

A Gantt chart provides the overview of the progress of a project in the form of a horizontal bar chart. A Gantt chart shows the planned schedule and actual progress of activities of a project in the form of horizontal bars with timeline along the horizontal axis. It gives an overview of the current status of the project, and which activities are behind, on or ahead of schedule. This is a simple and useful tool to control the project from a customer perspective. PERT and CPM are more useful for project manager, who needs to assign resources to activities as per their criticality and slack.