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Dual converter operates in _________________

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Dual converter operates in _________________

(a) 1

(b) 2

(c) 3

(d) 4

I have been asked this question in a national level competition.

I'd like to ask this question from DC Motor Control Through Converters topic in division Motor Control by Static Power Converters of DC Machines

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Right option is (d) 4

Explanation: The dual-converter is the modified one and can operate in all the four quadrants. Its circuit contains two full-converters converting to the DC in either direction. The dual converter provides virtually instantaneous reversal of voltage at DC terminals.

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