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

Filters allow signals within a desired frequency band to pass while attenuating signals outside that band.

Question 2

What is the time constant of an RC circuit?

Accepted Answer

R multiplied by C

Answer

The RC time constant (τ = RC) determines how quickly a capacitor charges or discharges through a resistor.

Question 3

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

Accepted Answer

Amplitude

Answer

In Amplitude Modulation (AM), the carrier wave's amplitude is varied in proportion to the audio signal.

Question 4

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

Accepted Answer

Transformer

Answer

A transformer uses electromagnetic induction to step voltage up or down based on its turns ratio.

Question 5

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

Accepted Answer

Convert AC voltage to pulsating DC

Answer

A rectifier uses diodes to convert alternating current into pulsating direct current.

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