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ELE3BG
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1992-01-26
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FCC GENERAL Exam Question Pool. Subelement 3BG.
Practical Circuits. ? Questions.
---------------------------------------------------
3BG 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 current through each diode is about the
same
C. To smooth the output waveform
D. To decrease the output voltage
3BG 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
3BG 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
3BG 1.4 B
How many degrees of each cycle does a half-wave rectifier
utilize?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
3BG 1.5 D
How many degrees of each cycle does a full-wave rectifier
utilize?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
3BG 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
3BG 1.7 D
What components comprise a power supply filter network?
A. Diodes
B. Transformers and transistors
C. Quartz crystals
D. Capacitors and inductors
3BG 1.8 D
What should be the peak-inverse-voltage rating of the rectifier
in a full-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
3BG 1.9 D
What should be the peak-inverse-voltage rating of the rectifier
in a half-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
3BG 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
--------------------------------------------------
End of Subelement 3BG.