A dc to dc transistor chopper supplied from a fixed voltage

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A dc to dc transistor chopper supplied from a fixed voltage dc source feeds a fixed resistive-inductive load and a free-wheeling diode. The chopper operates at 1 kHz and 50% duty cycle. Without changing the value of the average dc current through the load, if it is desired to reduce the ripple content of load current, the control action needed will

1. increase chopper frequency keeping the duty cycle constant
2. increases chopper frequency and duty cycle in equal ratio
3. decrease only the chopper frequency
4. decrease only the duty cycle

Correct Option: A

NA