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The average value of chopper output waveform is given by _____________

(a) αV

(b) V/α

(c) α2V

(d) V/α2

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This interesting question is from DC Motor Control Through Choppers topic in section Motor Control by Static Power Converters of DC Machines

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Correct option is (a) αV

Explanation: Here the average value of the chopper output voltage waveform is given by Va=V tON/(tON+tOFF) = V (tON/T) =αV. So, by varying duty cycle α one can vary the average voltage at output.

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