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 effect of adding a capacitor in series with an antenna feedline for DC blocking?
Answer: It passes RF while blocking DC
A series capacitor blocks DC but presents low impedance to RF signals, allowing them to pass.
What is the power factor of a purely resistive AC circuit?
Answer: 1
A purely resistive circuit has a power factor of 1 because voltage and current are in phase.
Which semiconductor device is commonly used as a voltage-controlled switch in digital logic?
Answer: MOSFET
MOSFETs are widely used as switches in digital logic because gate voltage controls channel conductivity.
What is the purpose of a decoupling capacitor placed near an IC power pin?
Answer: Filter high-frequency noise and supply instantaneous current
Decoupling capacitors filter power supply noise and provide local charge reservoir for fast current demands.
What does the 'Q' factor of a coil or resonant circuit indicate?
Answer: The ratio of reactance to resistance, indicating selectivity and efficiency
Q factor is the ratio of reactance to resistance; higher Q means sharper resonance and lower losses.
In which region does a transistor operate when used as a linear amplifier?
Answer: Active (linear) region
Linear amplifiers operate transistors in the active region where collector current varies proportionally with base current.
What is electrical impedance?
Answer: The total opposition to AC current including resistance and reactance
Impedance (Z) combines resistance and reactance into the total opposition to AC current flow.