Assignment 6.pdf - Assignment 6 State dependent system...

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1 Assignment 6: State dependent system models 1. Two nickel-cadmium batteries provide electrical power to operate a satellite transceiver. If both batteries are operating in parallel, they have an individual failure rate of 0.1 per year. If one fails, the other can operate the transceiver (at a reduced power output). However, the increased electrical demand will triple the failure rate of the remaining battery. Determine the system reliability at 1, 2, 3, 4, and 5 yr. What is the system MTTF? 2. A computerized airline reservation system has a main computer on-line and a secondary standby computer. The on-line computer fails at a constant rate of 0.001 failure/hr, and the standby unit fails when on-line at the constant rate of 0.005 failure per hour. There are no failures while the unit is in the standby mode. (a) Determine the system reliability over a 72-hr period. (b) The airline desires to have a system MTTF of 2000 hr. Determine the (minimum) MTTF of the main computer to achieve this goal assuming that the standby computer
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