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Which of the following correctly suits with chopper?

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Which of the following correctly suits with chopper?

(a) Thyristor in series with load

(b) Thyristor in parallel with load

(c) Thyristor switch in series with load

(d) Thyristor switch in parallel with load

This question was addressed to me in an international level competition.

This intriguing question originated from DC Motor Control Through Choppers in portion Motor Control by Static Power Converters of DC Machines

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The correct option is (c) Thyristor switch in series with load

The explanation: A chopper is essentially a thyristor switch in series with the load. A shunting diode is provided across the load because free-wheeling the load current when thyristor is off. The thyristor can be shown enclosed by a dotted square can be turned-off over a time period and the cycle is repeated.

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