Physics Circle home Student Login

Home›Chapters›Semiconductor Electronics PYQs›Special Purpose Diodes›Question 45

JEE Main 2023 (10 Apr, Shift 1) · Special Purpose Diodes

Special Purpose Diodes question from JEE Main 2023 (10 Apr, Shift 1)

Q45JEE Main 2023 · 10 APR · SHIFT 1Medium

Special Purpose Diodes

A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8V and it has to regulate voltage fluctuating between 3 V and 10 V. The value of resistance Rs for safe operation of diode will be

Figure

Show answer and solution

Answer: (c)

  1. Maximum safe Zener current: IZ,max=PVZ=1.68=0.2I_{Z,max} = \frac{P}{V_Z} = \frac{1.6}{8} = 0.2 A
  2. Worst case is the highest input 1010 V: drop across Rs=10−8=2R_s = 10 - 8 = 2 V.
  3. Rs=20.2=10 ΩR_s = \frac{2}{0.2} = 10\ \Omega
  4. So the answer is (c) 10 Ω10\ \Omega.
Report a mistake

More questions on Special Purpose Diodes