HAM FREE HAM Radio Extra Class Test Practical Circuits and Components Questions and Answers 2

Question 1

What is the primary advantage of a Chebyshev low-pass filter design compared to a Butterworth design of the same order?

Accepted Answer

Steeper rolloff in the stopband

Answer

Flatter passband response

Answer

Lower component count

Answer

Higher power handling

Question 2

In a Class AB push-pull amplifier, what is the purpose of the slight forward bias applied to both transistors?

Accepted Answer

To reduce crossover distortion

Answer

To increase power output

Answer

To improve frequency response

Answer

To lower the input impedance

Question 3

What type of circuit is typically used to generate a stable reference frequency from a crystal oscillator for a PLL synthesizer?

Accepted Answer

Temperature-compensated crystal oscillator (TCXO)

Answer

Hartley oscillator

Answer

Phase-shift oscillator

Answer

Wien bridge oscillator

Question 4

What is the function of a diplexer in an amateur radio station?

Accepted Answer

To allow simultaneous operation on two different bands using one antenna

Answer

To split an audio signal into two channels

Answer

To combine two power amplifiers into one output

Answer

To match impedance between a transceiver and a dummy load

Question 5

Which component in a superheterodyne receiver is responsible for rejecting the image frequency?

Accepted Answer

The preselector or front-end bandpass filter

Answer

The IF amplifier

Answer

The AGC circuit

Answer

The beat frequency oscillator

Question 6

What is the primary purpose of neutralization in a vacuum tube or transistor RF amplifier?

Accepted Answer

To cancel internal feedback that causes self-oscillation

Answer

To balance the push-pull output stages

Answer

To equalize gain across the operating bandwidth

Answer

To reduce harmonic distortion in the output