Ham Radio Technician Test Basic Electronics & Circuitry 5

Question 1

What is the purpose of a filter in a ham radio receiver?

Accepted Answer

Select desired signals and reject unwanted ones

Answer

Amplify all incoming signals equally

Answer

Convert analog signals to digital

Answer

Generate the local oscillator frequency

Question 2

What is the time constant of an RC circuit?

Accepted Answer

R multiplied by C

Answer

R divided by C

Answer

R plus C

Answer

The square root of R times C

Question 3

What type of wave has its amplitude varied to carry information in AM radio?

Accepted Answer

Amplitude

Answer

Frequency

Answer

Phase

Answer

Pulse width

Question 4

Which component would you use to convert a higher AC voltage to a lower AC voltage?

Accepted Answer

Transformer

Answer

Voltage divider resistor

Answer

Zener diode

Answer

Voltage regulator IC

Question 5

What is the function of a rectifier circuit in a power supply?

Accepted Answer

Convert AC voltage to pulsating DC

Answer

Regulate voltage to a fixed level

Answer

Filter AC ripple from the output

Answer

Step up the AC input voltage

Question 6

What is the significance of the 'knee voltage' of a diode?

Accepted Answer

The forward voltage at which the diode begins conducting significantly

Answer

The maximum reverse voltage before breakdown

Answer

The voltage at which the diode becomes an open circuit

Answer

The peak inverse voltage rating

Question 7

What does 'RMS' stand for and why is it important in AC circuits?

Accepted Answer

Root Mean Square; it represents the equivalent DC heating value of an AC waveform

Answer

Radio Modulation Signal; it describes carrier power

Answer

Resistance Measurement Standard; it calibrates test equipment

Answer

Resonant Mode Signal; it describes tuned circuit behavior