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D1First Exam(S06)

# D1First Exam(S06) - The Hashemite University Faculty of...

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The Hashemite University Faculty of Engineering Mechanical Engineering Department Machine Design I Spring 2006 Instructor: Dr. Ala Hijazi First Exam Name: _____________________ Part I – Closed Book Please Read Questions Carefully – Good Luck! (18 points) 1. For the flowing statements circle one, true or false. The factor of safety is defined as the ratio of stress to strength. T F If 30 parts fail out of each 100 parts, this means that the reliability is 0.3. T F The probability density function for two normally distributed sets of data is shown below: The mean for data set A is smaller than that of set B. T F The standard deviation of data set A is smaller than that of set B. T F A number of samples were picked randomly out of a truck load of steel pieces and were tested for yield strength. If engineer "A" reported the yield strength as being 400 MPa and engineer "B" reported the yield strength as being 410 MPa, this means that engineer "A" reported the yield strength at a higher reliability. T F

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