FCC General Exam Question Pool.   Subelement 3BG.
Practical Circuits.     1 Question.


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3G 1.1   A
Why should a resistor and capacitor be wired in
parallel with power supply rectifier diodes?

 A. To equalize voltage drops and guard
    against transient voltage spikes.
 B. To ensure that the Back Voltage across
    each diode is about the same.
 C. To smooth the output waveform.
 D. To decrease the output voltage.


3G 1.2   C
What function do capacitors serve when resistors and
capacitors are connected in parallel with
high voltage power supply rectifier diodes?

 A. They double or triple the output voltage.
 B. They block the alternating current.
 C. They protect those diodes that develop
    back resistance faster than other diodes.
 D. They regulate the output voltage.


3G 1.3   D
What is the output waveform of an unfiltered full wave
rectifier connected to a resistive load.

 A. A steady DC voltage.
 B. A sine wave at half the frequency of the AC input.
 C. A series of pulses at the same frequency as the AC input.
 D. A series of pulses at twice the frequency of the AC input.


3G 1.4   B
How many degrees of a cycle does
a Half Wave rectifier utilize?

 A. 90 degrees.
 B. 180 degrees.
 C. 270 degrees.
 D. 360 degrees.


3G 1.5   D
How many degrees of a cycle does
a Full Wave rectifier utilize?

 A. 90 degrees.
 B. 180 degrees.
 C. 270 degrees.
 D. 360 degrees.


3G 1.6   A
Where is a power supply Bleeder Resistor connected?

 A. Across the filter capacitor.
 B. Across the power supply input.
 C. Between the transformer primary and secondary.
 D. Across the inductor in the output filter.


3G 1.7   D
What components comprise a power supply filter network?

 A. Diodes.
 B. Transformers and Transistors.
 C. Quartz crystals.
 D. Capacitors and Inductors.


3G 1.8   D
What should be the Peak Inverse Voltage rating
of the rectifier in a Half Wave Power supply?

 A. One quarter the normal output voltage of the power supply.
 B. Half the normal output voltage of the power supply.
 C. Equal to the normal output voltage of the power supply.
 D. Double the normal peak output voltage of the power supply.


3G 1.9   D
What should be the Peak Inverse Voltage rating
of the rectifier in a Full Wave Power supply?

 A. One quarter to one half the normal peak
    output voltage of the power supply.
 B. Half the normal output voltage of the power supply.
 C. Equal to the normal output voltage of the power supply.
 D. One to two times the normal peak
    output voltage of the power supply.


3G 2.8   B
What should the impedance of a Low Pass Filter
be as compared to the impedance of the
transmission line into which it is inserted?

 A. Substantially higher.
 B. About the same.
 C. Substantially lower.
 D. Twice the transmission line impedance.


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End of Subelement 3BG.