Basic Electronics & Circuitry Flashcards
7 cards from real Ham Radio Technician Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basic Electronics & Circuitry flashcards as text
What is the purpose of a filter in a ham radio receiver?
Answer: Select desired signals and reject unwanted ones
Filters allow signals within a desired frequency band to pass while attenuating signals outside that band.
What is the time constant of an RC circuit?
Answer: R multiplied by C
The RC time constant (τ = RC) determines how quickly a capacitor charges or discharges through a resistor.
What type of wave has its amplitude varied to carry information in AM radio?
Answer: Amplitude
In Amplitude Modulation (AM), the carrier wave's amplitude is varied in proportion to the audio signal.
Which component would you use to convert a higher AC voltage to a lower AC voltage?
Answer: Transformer
A transformer uses electromagnetic induction to step voltage up or down based on its turns ratio.
What is the function of a rectifier circuit in a power supply?
Answer: Convert AC voltage to pulsating DC
A rectifier uses diodes to convert alternating current into pulsating direct current.
What is the significance of the 'knee voltage' of a diode?
Answer: The forward voltage at which the diode begins conducting significantly
The knee voltage (about 0.6-0.7V for silicon) is the threshold where forward current rises sharply.
What does 'RMS' stand for and why is it important in AC circuits?
Answer: Root Mean Square; it represents the equivalent DC heating value of an AC waveform
RMS (Root Mean Square) voltage or current produces the same heating effect in a resistor as an equivalent DC value.