A step down chopper operates from a dc voltage source V

1.	A step down chopper operates from a dc voltage source V
A.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V<sub>s</sub> t<sub>r</sub></center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(t<sub>r</sub> + t<sub>f</sub> + t<sub>0</sub>)</td></tr></table>
B.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>(V<sub>s</sub> t<sub>r</sub> + E<sub>b</sub> t<sub>f</sub>)</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(t<sub>r</sub> + t<sub>f</sub> + t<sub>0</sub>)</td></tr></table>
C.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>(V<sub>s</sub> t<sub>r</sub> + E<sub>b</sub> t<sub>0</sub>)</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(t<sub>r</sub> + t<sub>f</sub> + t<sub>0</sub>)</td></tr></table>
D.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V<sub>s</sub>t<sub>r</sub> + E<sub>b</sub>[ t<sub>f</sub> + t<sub>0</sub>]</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(t<sub>r</sub> + t<sub>f</sub> + t<sub>0</sub>)</td></tr></table>
Answer» D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V<sub>s</sub>t<sub>r</sub> + E<sub>b</sub>[ t<sub>f</sub> + t<sub>0</sub>]</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">(t<sub>r</sub> + t<sub>f</sub> + t<sub>0</sub>)</td></tr></table>

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A step down chopper operates from a dc voltage source V

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