If the maximum efficiency of a full wave rectifier is $\mathrm{x} \%$ and that of half wave rectifier is…
If the maximum efficiency of a full wave rectifier is $\mathrm{x} \%$ and that of half wave rectifier is $\mathrm{y} \%$, then the relation between $\mathrm{x}$ and $\mathrm{y}$ is
$\mathrm{x}=\mathrm{y}$
$y=2 x$
$x=2 y$
$y=4 x$
Solution
Maximum efficiency of full wave rectifier $x=81.2 \%$
Maximum efficiency of half wave rectifier $y=40.6 \%$
$\therefore \quad \frac{x}{y}=\frac{2}{1}$
Then, relation between $\mathrm{x}$ and $\mathrm{y}$ is $\mathrm{x}=2 \mathrm{y}$.