Electrical Engineering XYZ MCQs
If no external potential energy is applied to the PN junction then diode is said to be:
- Reversed biased
- Zero Bias
- Forward biased
- None of the above
Correct answer: 2. Zero Bias
Explanation:
- In a PN junction diode, when no external potential (voltage) is applied across it, it’s termed as “Zero Bias.”
- In this condition, the diode operates solely based on the built-in potential generated by the diffusion of charge carriers across the junction.
- When the external potential is applied in a way that the positive terminal of the battery is connected to the P-type semiconductor and the negative terminal is connected to the N-type semiconductor, it’s called “Forward Bias.”
- Conversely, when the external potential is applied in a way that the positive terminal of the battery is connected to the N-type semiconductor and the negative terminal is connected to the P-type semiconductor, it’s termed as “Reverse Bias.”
- So, when no external potential is applied, it’s zero bias.