Regulated Variable Output DC Power Supply

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Hi. This is a question for a homework assignment (2nd yearengineering, 1st year Electrical engineering, ENEL2XX Principles ofelectronics), and I cannot find any similar questions online. Ihave answered a number of questions regarding voltage ranges andthermal resistance, but the final question is:
(vi) What is the purpose of the capacitor C1?
My first instinct was to assume it is for smoothing ofthe output signal (as in a linear power supply), but of course thisis a DC input so shouldnt (?) have any ripple. I can't figure outwhy it is there, since a capacitor should be open circuit to DC,and (to me) it does nothing.
Could anyone provide an explanation?
Thanks very much

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