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- Question
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
- Correct Answer
- a voltage-dependent resistor
- 1. 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
- 2. 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
- 3. 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
- 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
- 5. 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
- 6. 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
- 7. 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
- 8. The characteristic curve for the complex model of a silicon diode shows that
Options- A. the barrier potential is 0 V
- B. the barrier potential stays fixed at 0.7 V
- C. the barrier potential increases slightly with an increase in current
- D. the barrier potential decreases slightly with an increase in current Discuss
- 9. Testing a good diode with an ohmmeter should indicate
Options- A. high resistance when forward or reverse biased
- B. low resistance when forward or reverse biased
- C. high resistance when reverse biased and low resistance when forward biased
- D. high resistance when forward biased and low resistance when reverse biased Discuss
- 10. An IC regulator receives an overload; it will:
Options- A. shut down
- B. compensate for heat
- C. provide more voltage
- D. sample and adjust Discuss
Diodes and Applications problems
Search Results
Correct Answer: 1%
Correct Answer: A full-wave rectifier and a bridge rectifier
Correct Answer: center-tapped secondary
Correct Answer: in the same direction
Correct Answer: the p-type material, which is called the anode
Correct Answer: breakdown voltage
Correct Answer: forward biased
Correct Answer: the barrier potential increases slightly with an increase in current
Correct Answer: high resistance when reverse biased and low resistance when forward biased
Correct Answer: shut down
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