The Chief Design Engineer for Colonial Warning Systems Wants to Know

question 37

Multiple Choice

The chief design engineer for Colonial Warning Systems wants to know the reliability of a two-lamp device intended to warn the operator of potential problems with a commercial steam kettle.One (either) lamp is to be lit if steam pressure drops below the desired level,and two (both) are to be lit if temperature drops below a desired level.His supplier estimates that a lamp has a failure rate of .2 per hour of operation,and a mean wear-out time of seven years with a standard deviation of eight months.What warranty period for a lamp would give a probability of .9987 that it would not require warranty service?

• A)5 years
• B)5.67 years
• C)6.33 years
• D)7 years
• E)9 years

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