Question $2$

a$)$ Using the circuit diagram in Figure $2$a$,$ and taking the output signal across the load resistor, explain how the 'capacitor input filter' is used to filter the rectified signal

$[10$ marks$]$

Figure $2$a

b$)$ State at least three advantages and three disadvantages of the 'capacitor input filter'

$[6$ marks$]$

c$)$ The input of a certain regulator increases by $3\mathrm{.}5$ V $.$ As a result, the output voltage increases by $0\mathrm{.}042$ V $.$ The nominal output is $20$ V $.$ Determine the line regulation in both $\%$ and in $\%/$V

$[4$ marks$]$

d$)$ Using a diagram explain how the series regulator works

$[5$ marks$]$

e$)$ Two power supplies A and $B$ are available on the market. Power supply A has no$-$load and full$-$load voltages of $30$ V and $25$ V respectively whereas these values are $30$ V and $29$ V for power supply $B.$ Which is the better power supply?

$[5$ marks$]$