Direction: In the voltage regulator circuit shown below. The zener diode current is to be limited to the range 5 ≤ i Z ≤ 100 mA.
-
The range of possible load resistance—
-
- 60 ≤ RL ≤ 372 Ω
- 60 ≤ RL ≤ 200 Ω
- 40 ≤ RL ≤ 192 Ω
- 40 ≤ RL ≤ 360 Ω
Correct Option: C
The range of possible load resistance 
| RL (min) = | = | | IL (max) | IL (max) |
| or RL (min) = | = 40 Ω | 120 mA |
| and RL (max) = | = | | IL (max) | IL (min) |
| or RL (max) = | = 192 Ω | 25mA |
Therefore, 40 Ω ≤ RL ≤ 192 Ω Hence alternative (C) is the correct choice.
