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Most commonly used control element in voltage regulators is

Most commonly used control element in voltage regulators is Correct Answer BJT

The Zener diode is biased in reverse bias, the total output voltage is the sum of VZ + VBE

The Series voltage regulator using BJT and Zener diode is shown.

[ alt="RRB JE EE 6 D3" src="//storage.googleapis.com/tb-img/production/19/02/RRB%20JE%20EE%206_D3.PNG" style="width: 284px; height: 160px;">

Operation:

Output Voltage Decreases:

Under this circumstance, the increased base-emitter voltage will cause transistor Q1 to conduct more, thus increasing the output voltage. Hence, the output voltage will be maintained at a constant level.

Output Voltage Increases:

Under this circumstance, the decreased base-emitter voltage will cause Q1 to conduct less, thus reducing the output voltage. Hence, the output voltage will be maintained at a constant level.

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