Refer to FIGURE 6.3 and answer the questions that follow - NSC Electrical Technology Electronics - Question 6 - 2024 - Paper 1

The quiescent voltage (Vce) can be determined from the load line of the DC characteristics. Using the quiescent collector current (Ic = 2 mA) and the voltage supply (Vcc = 20 V):

The quiescent voltage is calculated as:

$V_{CE} = V_{CC} - I_C imes R_C$

Assuming a collector resistor (Rc) of 5 kΩ:

$V_{CE} = 20V - (0.002 A imes 5000Ω) = 10V$

Therefore, the quiescent voltage is 10 V.

On the answer sheet, you should mark the point Q at the intersection of the Ic and Vce values derived from the previous calculations, which corresponds to the operating point (2 mA, 10 V).

1. Thermal Runaway: As the temperature increases, the leakage current increases, causing the collector current to rise, which can lead to the destruction of the transistor if not properly managed.

2. Distortion of Output Waveform: Improper biasing can result in a nonlinear transfer characteristic, leading to distortion in the output signal.