Figure Q3 shows the reliability block diagram of a simplified computer system with a redundant fan configuration. The reliabilities of the power supply, the identical) fan, and the processor are:...

Figure Q3 shows the reliability block diagram of a simplified computer system with a redundant fan configuration. The reliabilities of the power supply, the identical) fan, and the processor are: 0.95, 0.90, and 0.98 respectively and have an exponential function. The hard drive is to be used for application that will last for 2,000 hours. Three options are available for selection, and their reliability functions are listed below: i. ïi. iii. Normal, with a mean life = 2,725 hours and standard deviation of 500 hours Exponential, with MTTF = 35,000 hours Wei bull, with shape factor = 2, characteristic life =10,000 hours and location parameter = 0 (a) By comparing their reliabilities, which hard drive option should be selected if all choices cost the same? (b) Find the computer system reliability. (c) If the standby is used for the cooling fan subsystem, draw the revised reliability block diagram according to IEC 61078:2016. (d) Evaluate the system reliability assuming perfect switching standby. (e) If the switching device operates correctly 99 times out of 100, evaluate the new system reliability. Fan Power Supply Processor Hard Drive Fan Figure Q3.