Ham Radio General Class Test Ham Radio General Class Test Electronic Principles and Circuits Questions and Answers 3

Question 1

What is the time constant of a circuit consisting of a 100-microfarad capacitor in series with a 10-kilohm resistor?

Accepted Answer

1 second

Answer

The time constant equals R times C: 10,000 ohms multiplied by 0.0001 farads equals 1 second.

Question 2

What is the function of a coupling capacitor between amplifier stages?

Accepted Answer

To pass AC signals while blocking DC bias voltages

Answer

A coupling capacitor allows the AC signal to pass between stages while preventing DC bias from one stage from affecting another.

Question 3

What is the approximate voltage across a forward-biased silicon diode junction?

Accepted Answer

0.7 volts

Answer

A forward-biased silicon diode has a typical junction voltage drop of approximately 0.7 volts.

Question 4

What type of semiconductor component increases its resistance as temperature rises?

Accepted Answer

Positive Temperature Coefficient (PTC) thermistor

Answer

A PTC thermistor has a resistance that increases with rising temperature, as indicated by its positive coefficient.

Question 5

In a common-emitter transistor amplifier, what is the phase relationship between the input and output signals?

Accepted Answer

The output is 180 degrees out of phase with the input

Answer

A common-emitter amplifier inverts the signal, producing a 180-degree phase shift between input and output.

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