Question
In Figure E7-1, what is the purpose of R1 and R2?
Answer Options
- A) Load resistors
- B) Voltage divider bias
- C) Self bias
- D) Feedback
Correct Answer: B
Explanation
Figure E7-1 shows a common emitter amplifier circuit using a Bipolar Junction Transistor (BJT). For the amplifier to operate in the linear region (Class A, AB, or B), the base-emitter junction must be appropriately forward-biased to establish the quiescent operating point (Q-point).
In this circuit, R1 and R2 form a resistor network that applies a fixed DC voltage to the base terminal. Their purpose is to provide Voltage divider bias. This highly stable form of bias determines the DC voltage at the base, which in turn sets the DC current flowing through the transistor when no signal is present, defining the amplifier’s class of operation.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!