Discussion
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- Question
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
- Correct Answer
- varactor diode
- 1. 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 Discuss
- 2. 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. Discuss
- 3. What is the current through the LED?
Options- A. 0 mA
- B. 23 mA
- C. 18 mA
- D. 13 mA Discuss
- 4. The diode schematic arrow points to the:
Options- A. trivalent-doped material
- B. positive axial lead
- C. anode lead
- D. cathode lead Discuss
- 5. In a power supply diagram, which block indicates a pulsating dc output?
Options- A. transformer
- B. filter
- C. rectifier
- D. regulator Discuss
- 6. The mimicking of an open/closed switch by a diode allows alternating current to be:
Options- A. rectified
- B. regulated
- C. controlled
- D. attenuated Discuss
- 7. 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 Discuss
- 8. With full-wave rectification, current through the load resistor must be:
Options- A. in opposite directions
- B. to the external load
- C. from the reverse biased diode
- D. in the same direction Discuss
- 9. Which type of transformer is required to create a 180 degree input to a rectifier?
Options- A. center-tapped secondary
- B. step-down secondary
- C. stepped-up secondary
- D. split winding primary Discuss
- 10. Which of the following circuits would require the least amount of filtering?
Options- A. A half-wave rectifier
- B. A full-wave rectifier
- C. A bridge rectifier
- D. A full-wave rectifier and a bridge rectifier Discuss
Diodes and Applications problems
Search Results
Correct Answer: internal temperature is too high
Correct Answer: semiconductors
Correct Answer: 13 mA
Correct Answer: cathode lead
Correct Answer: rectifier
Correct Answer: rectified
Correct Answer: the p-type material, which is called the anode
Correct Answer: in the same direction
Correct Answer: center-tapped secondary
Correct Answer: A full-wave rectifier and a bridge rectifier
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