Question

What is the value of voltage VB of a CB short circuit current frequency response configuration if VCC = 12V, R1 = 25kΩ and R2 = 6kΩ?

(a) 2.84V

(b) 13.03V

(c) 2.45V

(d) 2.32V

This question was posed to me in a national level competition.

Asked question is from The CB Short Circuit Current Frequency Response in division High Frequency Transistor of Electronic Devices & Circuits

Answer 1

The correct option is (d) 2.32V

The best I can explain: The voltage VB of a simplified CB short circuit current frequency response configuration can be calculated using VB = I × R2. Given, VCC = 12V and R1 = 25kΩ and R2 = 6kΩ:

I = VCC / R1 + R2 = 12 / (25 + 6) = 0.387mA

VB = I × R2 = 0.387mA × 6kΩ = 2.32V