Diodes and Applications problems
- 1. 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
Correct Answer: the barrier potential increases slightly with an increase in current
- 2. 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
Correct Answer: high resistance when reverse biased and low resistance when forward biased
- 3. 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
Correct Answer: shut down
- 4. When a diode is destroyed it has infinite impedance. When damaged by heat it will probably:
Options- A. short
- B. conduct more
- C. conduct less
- D. open Discuss
Correct Answer: short
- 5. The area at the junction of p-type and n-type materials that has lost its majority carriers is called the
Options- A. barrier potential
- B. depletion region
- C. n region
- D. p region Discuss
Correct Answer: depletion region
- 6. With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
Options- A. 0 degrees
- B. 90 degrees
- C. 180 degrees
- D. 360 degrees Discuss
Correct Answer: 180 degrees
- 7. Shunting the ac component away from the load is the task of a:
Options- A. transformer
- B. filter
- C. regulator
- D. rectifier Discuss
Correct Answer: filter
- 8. If the frequency of the applied ac signal to a half-wave rectifier is 60 Hz, the frequency of the pulsating dc output will be
Options- A. 30 pps
- B. 60 pps
- C. 90 pps
- D. 120 pps Discuss
Correct Answer: 60 pps
- 9. The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:
Options- A. half the peak secondary voltage
- B. twice the peak secondary voltage
- C. the peak value of the secondary voltage
- D. four times the peak value of the secondary voltage Discuss
Correct Answer: the peak value of the secondary voltage
- 10. A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because:
Options- A. there is a shorter time between peaks
- B. there is a longer time between peaks
- C. the larger the ripple, the better the filtering action
- D. none of the above Discuss
Correct Answer: there is a shorter time between peaks
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