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Which regulator topology would replace a shunt regulator where efficiency matters?

  • A.A voltage doubler ahead of the regulator
  • B.A larger filter capacitor before it
  • C.A series pass regulator
  • D.A second shunt stage in cascade

Answer: C

A series pass regulator passes only what the load takes, so its waste falls with the load rather than rising. A second shunt stage would compound the problem, a doubler raises the voltage and hence the waste, and more capacitance addresses ripple rather than efficiency. Wherever a design wastes a resource in proportion to how little is used, the fix is an arrangement that draws only what is needed.

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