In a voltage-divider bias circuit with VCC = 25 V, R1 = 10 kΩ, R2 = 2.2 kΩ, RC = 3.6 kΩ, and RE = 1 kΩ, what is the resulting emitter voltage?
Show answer Hide answer
Answer: D. 8 V
Explanation
Applying standard voltage-divider biasing formulas with the specified resistor and supply values yields eight volts. The base voltage is determined by the parallel combination of resistors and the supply voltage divider. Subtracting the base-emitter voltage drop from the calculated base voltage results in the emitter voltage. Voltage-divider bias provides stable operating points for transistor amplifiers independently of beta variations. Calculations involve Ohm's law and Kirchhoff's laws applied to the input biasing network of the transistor. Emitter resistors provide negative feedback that stabilizes collector current against temperature changes.
Biasing calculations are fundamental for designing linear amplifiers used in audio and radio frequency equipment. Engineers must verify emitter voltages during prototyping to ensure transistors remain properly biased. Incorrect bias voltage calculations lead to signal clipping, distortion, or complete circuit failure. Option A underestimates the calculated emitter voltage derived from the specific resistor network values. Option B represents a much lower voltage that contradicts the voltage divider math for these components. Option C is incomplete or malformed as an option choice in the provided question set.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Within an energized, charged capacitor, where is the electrical energy physically stored________________?
Show answer Hide answer
Answer: B. electric field
A charged capacitor stores electrical energy physically within the electrostatic electric field between its plates. Applying a voltage differential creates this electric field by accumulating opposite charges on the para...
Q2. In a load-commutated DC-DC chopper circuit, what functional role does the commutating capacitor serve_____________?
Show answer Hide answer
Answer: C. Symmetric trapezoidal voltage across itself
In load-commutated chopper circuits, the commutating capacitor handles dynamic charging and discharging cycles. These electrical cycles produce a characteristic symmetric trapezoidal voltage waveform across the capacitor...
Q3. In the DC equivalent circuit analysis of a transistor amplifier, how are the capacitors treated__________________?
Show answer Hide answer
Answer: B. Open
Capacitors block direct current signals entirely once they reach a fully charged steady-state condition. During DC equivalent circuit analysis, this blocking behavior is modeled by treating capacitors as open circuits. R...
Q4. Inductors function as a short circuit when exposed to_______________?
Show answer Hide answer
Answer: B. DC
An inductor offers zero reactance to steady-state direct current, effectively acting as a simple short circuit. Constant DC current produces no changing magnetic flux, meaning no counter electromotive force is induced. W...
Q5. In a pure intrinsic semiconductor at thermal equilibrium, how do the numbers of free electrons and holes compare_____________?
Show answer Hide answer
Answer: A. Equals the number of holes
Thermal energy in pure intrinsic semiconductors continuously breaks covalent bonds between silicon atoms. Each broken bond releases a free electron into the conduction band while leaving behind a vacant hole. Consequentl...
Q6. Determine which of the binary arithmetic operations are valid: 1. 1011 + 1010 = 10101; II. 1010 + 1101 = 10111 ?
Show answer Hide answer
Answer: A. I and II
Performing binary addition confirms that both listed mathematical operations yield correct sum results. Adding binary values follows standard rules where one plus one equals zero with a carry of one. Checking each additi...