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Electronics
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Diodes and Applications
Comments
Question
What is the current through the LED?
Options
A. 0 mA
B. 23 mA
C. 18 mA
D. 13 mA
Correct Answer
13 mA
Diodes and Applications problems
Search Results
1. The diode schematic arrow points to the:
Options
A. trivalent-doped material
B. positive axial lead
C. anode lead
D. cathode lead
Show Answer
Scratch Pad
Discuss
Correct Answer: cathode lead
2. In a power supply diagram, which block indicates a pulsating dc output?
Options
A. transformer
B. filter
C. rectifier
D. regulator
Show Answer
Scratch Pad
Discuss
Correct Answer: rectifier
3. What is the current through the zener diode?
Options
A. 0 mA
B. 7 mA
C. 8.3 mA
D. 13 mA
Show Answer
Scratch Pad
Discuss
Correct Answer: 7 mA
4. Rectifier output polarity depends upon:
Options
A. cycles of input
B. capacitor polarity
C. half or full wave
D. diode installation
Show Answer
Scratch Pad
Discuss
Correct Answer: diode installation
5. Electrons in the outermost orbit or shell of an atom are called
Options
A. free electrons
B. negative ions
C. valence electrons
D. conduction band electrons
Show Answer
Scratch Pad
Discuss
Correct Answer: valence electrons
6. The conduction band is closest to the valence band in
Options
A. semiconductors
B. conductors
C. insulators
D. The distance is the same for all of the above.
Show Answer
Scratch Pad
Discuss
Correct Answer: semiconductors
7. Thermal shutdown occurs in an IC regulator if:
Options
A. power dissipation is too high
B. internal temperature is too high
C. current through the device is too high
D. load resistance increases
Show Answer
Scratch Pad
Discuss
Correct Answer: internal temperature is too high
8. A diode for which you can change the reverse bias, and thus vary the capacitance is called a
Options
A. varactor diode
B. tunnel diode
C. zener diode
D. switching diode
Show Answer
Scratch Pad
Discuss
Correct Answer: varactor diode
9. The mimicking of an open/closed switch by a diode allows alternating current to be:
Options
A. rectified
B. regulated
C. controlled
D. attenuated
Show Answer
Scratch Pad
Discuss
Correct Answer: rectified
10. The arrow in the schematic symbol of a diode points to
Options
A. the
n
-type material, which is called the anode
B. the
n
-type material, which is called the cathode
C. the
p
-type material, which is called the anode
D. the
p
-type material, which is called the cathode
Show Answer
Scratch Pad
Discuss
Correct Answer: the
p
-type material, which is called the anode
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