$(2$ points$)$ For the three$-$phase circuit shown below, please use single phase equivalent circuit to:

a$.$ Obtain all phase and line voltages at the generator, taking the shown Van as the reference voltage $\backslash (\backslash$left$(0^\{\backslash$circ$\}\backslash$right$)\backslash ).$

$3.(1\mathrm{.}5$ points$)$ The network shows a rectifier circuit. Taking into account the simulation data on the figure and diodes Vknee $\backslash (=0\mathrm{.}8\backslash$mathrm$\{$~V$\}\backslash ),$ please:

a$.$ Obtain the secondary winding effective voltage.

b$.$ Obtain the primary winding peak voltage.

c$.$ Obtain the peak voltage across R$1$ and across R$3.$

$4.($ puinis$)$ regaraing semiconductor device, please:

a$)$ Fill in the table shown below, describing the MOSFET modes of operation.