Ham Radio Technician Test Basic Electronics & Circuitry 4

Question 1

What is the effect of adding a capacitor in series with an antenna feedline for DC blocking?

Accepted Answer

It passes RF while blocking DC

Answer

A series capacitor blocks DC but presents low impedance to RF signals, allowing them to pass.

Question 2

What is the power factor of a purely resistive AC circuit?

Accepted Answer

1

Answer

A purely resistive circuit has a power factor of 1 because voltage and current are in phase.

Question 3

Which semiconductor device is commonly used as a voltage-controlled switch in digital logic?

Accepted Answer

MOSFET

Answer

MOSFETs are widely used as switches in digital logic because gate voltage controls channel conductivity.

Question 4

What is the purpose of a decoupling capacitor placed near an IC power pin?

Accepted Answer

Filter high-frequency noise and supply instantaneous current

Answer

Decoupling capacitors filter power supply noise and provide local charge reservoir for fast current demands.

Question 5

What does the 'Q' factor of a coil or resonant circuit indicate?

Accepted Answer

The ratio of reactance to resistance, indicating selectivity and efficiency

Answer

Q factor is the ratio of reactance to resistance; higher Q means sharper resonance and lower losses.

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