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# Question #1 Table 1 below shows failure data for 250 germanium chips, all of which failed during the test period. Calculate and plot the probability...

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Question #1 Table 1 below shows failure data for 250 germanium chips, all of which failed during the test period. Calculate and plot the probability of failure (unreliability) and probability of success (reliability) as a function of time to failure. Table 1 failure data for chips Time to Failure (min) t Cumulative Failures , n(t) 0 0 20 9 40 23 60 50 90 83 160 113 230 143 400 160 900 220 1200 235 2500 240 2500 250
Question #2 Figure below shows a chemical system in which the temperature increases with the feed rate of flow-controlled stream A. Heat is removed by water circulation through a water cooled heat exchanger. Normal reactor temperature is 200 ° F, but a catastrophic runaway will start if the temperature reached 300 ° F. In view of this situation: 1. The reactor temperature is monitored (by TE/TT 714). 2. Rising temperature is alarmed at 225 ° F (see Horn). 3. An interlock shuts off stream A at 250 ° F, stopping the reaction (SV-1). 4. The operator can initiate the interlock by punching the panic switch (NC). a) Construct the fault tree for this system. b) Obtain the minimal cut sets.
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