Q$5.$ For the system given below, Assume room temperature and that $\frac{1}{4}-$watt fixed composition resistors are used. Assume

that failure rates of: BJT is $1\mathrm{.}5{10}^{-3}$ failures $/{10}^6$ hours, $R_C$ is $2\mathrm{.}5{10}^{-3}$ failures $/{10}^6$ hours and, $R_B$ is $7\mathrm{.}5{10}^{-3}$

failures $\frac{?}{{10}^6}$ hours Marks$]$

Find out:

a$)$ Type of system

b$)$ Total Failure rate $(s)$ Marks$]$

$($Parallel $/$ Series $)$ Marks $]$

c$)$ the overall system reliability in $20$ years, and $[1\mathrm{.}5$ Marks$]$

d$)$ the MTTF $[0\mathrm{.}5$ Marks$]*$ Solving this Formula useing step by step solve in peper no text