Name the device used to increase the voltage at the generating station.
a) Transformer
b) Capacitor
c) Diodes
d) None of the above

Hint: We need to seek out whether the given devices can increase the voltage. If yes then up to what extent do they increase the voltage.

Complete step by step answer:
a) Transformer: Transformers are capable of either increasing or decreasing the voltage and current levels of their supply, without modifying its frequency, or the quantity of wattage being transferred from one winding to a different via the magnetic circuit.

b) Capacitor: No capacitors alone don't increase Voltage. But they'll be employed in many circuits that make output voltages above the input. Capacitors are energy storage devices. Because capacitors store energy, they'll increase the apparent voltage in some circuits.
c) Diodes: so as to "turn on" and conduct current within the forward direction, a diode requires a particular amount of positive voltage to be applied across it. Once the voltage gets to about the forward voltage rating, though, large increases in current should still only mean a really small increase in voltage.

So, the correct answer is “Option A”.

Note:
The present is distributed through step-up transformers to extend the voltage and to push the ability over long distances. A transformer turns low-voltage electricity into high-voltage electricity while dropping this.
Hence, a transformer is employed to extend the voltage at the generating station.