Ham Radio General Class Test FREE Ham Radio General Class Test Electronic Principles and Circuits Questions and Answers 3

Question 1

What is the purpose of a bypass capacitor connected across the emitter resistor in a common-emitter amplifier?

Accepted Answer

To prevent signal gain reduction at AC frequencies

Answer

A bypass capacitor across the emitter resistor provides a low-impedance path for AC signals, preventing the resistor from reducing AC voltage gain.

Question 2

What type of filter passes frequencies above a specified cutoff frequency and attenuates those below it?

Accepted Answer

High-pass filter

Answer

A high-pass filter is designed to pass frequencies above its cutoff frequency while attenuating lower frequencies.

Question 3

What is the turns ratio of a transformer needed to match a 200-ohm source to a 50-ohm load?

Accepted Answer

2:1

Answer

The impedance ratio equals the square of the turns ratio, so sqrt(200/50) = sqrt(4) = 2, giving a 2:1 turns ratio.

Question 4

Which oscillator circuit uses a tapped inductor in its feedback network?

Accepted Answer

Hartley oscillator

Answer

The Hartley oscillator uses a tapped inductor or two inductors in series as part of its feedback network to sustain oscillation.

Question 5

What is the effect of negative feedback on an amplifier's bandwidth?

Accepted Answer

Bandwidth increases

Answer

Negative feedback reduces gain but increases the bandwidth of an amplifier, resulting in a more stable and wider frequency response.

Ham Radio General Class Test Practice Test