Diodes and Applications problems
- 1. 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 Discuss
Correct Answer: varactor diode
- 2. 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
Correct Answer: rectified
- 3. 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
Correct Answer: the p-type material, which is called the anode
- 4. 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
Correct Answer: in the same direction
- 5. 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
Correct Answer: center-tapped secondary
- 6. 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
Correct Answer: A full-wave rectifier and a bridge rectifier
- 7. What is the percent of regulation if Vnl = 20 V and Vfl = 19.8 V?
Options- A. 0%
- B. 1%
- C. .1%
- D. 5% Discuss
Correct Answer: 1%
- 8. What is a varistor?
Options- A. a voltage-dependent resistor
- B. a voltage-dependent diode
- C. a current-dependent resistor
- D. a current-dependent diode Discuss
Correct Answer: a voltage-dependent resistor
- 9. The voltage where current may start to flow in a reverse-biased pn junction is called the
Options- A. breakdown voltage
- B. barrier potential
- C. forward voltage
- D. biasing voltage Discuss
Correct Answer: breakdown voltage
- 10. When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, the diode is considered to be:
Options- A. not working
- B. forward biased
- C. reverse biased
- D. an open switch Discuss
Correct Answer: forward biased
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