Discussion
Regulated output voltage of a 3-pin fixed voltage regulator can be increased :
Answer: B
The output can be increased by increasing ground pin voltage.
A fixed regulator such as the 78xx holds a fixed voltage between its output and its ground (common) pin. If the ground pin is lifted above circuit ground by a resistor, a Zener diode or a potential divider, the output rises by the same amount: Vout = Vreg + Vground pin.
An external pass transistor increases the current the regulator can deliver, not its voltage. Cascading two regulators only drops the voltage further, and a voltage doubler at the input raises the input, which the regulator then removes, so the output stays fixed.
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