Discussion
Identify the incorrectly matched pair about the characteristics of a pn junction diode
Answer: A
The incorrectly matched pair is Cut-in voltage - Voltage up to which voltage-independent reverse current exists.
The cut-in (knee or threshold) voltage belongs to forward bias: it is the forward voltage beyond which the current rises sharply, about 0.7 V for silicon and 0.3 V for germanium. The small, nearly voltage-independent current is the reverse saturation current, which flows under reverse bias below breakdown.
The other pairs are correct: under reverse bias only a small leakage current flows until breakdown; with no bias the diffusion and drift currents cancel; at breakdown a sudden large current flows (by avalanche or Zener effect); and beyond the barrier voltage in forward bias the current rises nearly linearly.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development