Topic Outline
- MCQs in Zener Diode
- MCQs in Zener Regulator
- MCQs in Second Approximation of Zener Diode
- MCQs in Zener Drop-Out Point
- MCQs in Load Lines
- MCQs in Optoelectronic Devices
- MCQs in Schottky Diode
- MCQs in Varactor
- MCQs in Other Diodes
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. What is true about the breakdown voltage in a zener diode?
- a. It decreases when current increases.
- b. It destroys the diode.
- c. It equals the current times the resistance.
- d. It is approximately constant.
2. Which of these is the best description of a zener diode?
- a. It is a rectifier diode.
- b. It is a constant-voltage device.
- c. It is a constant-current device.
- d. It works in the forward region.
3. A zener diode
- a. Is a battery
- b. Has a constant voltage in the breakdown region
- c. Has a barrier potential of 1 V
- d. Is forward-biased
4. The voltage across the zener resistance is usually
- a. Small
- b. Large
- c. Measured in volts
- d. Subtracted from the breakdown voltage
5. If the series resistance decreases in an unloaded zener regulator, the zener current
- a. Decreases
- b. Stays the same
- c. Increases
- d. Equals the voltage divided by the resistance
6.In the second approximation, the total voltage across the zener diode is the sum of-the breakdown voltage and the voltage across the
- a. Source
- b. Series resistor
- c. Zener resistance
- d. Zener diode
7. The load voltage is approximately constant when a zener diode is
- a. Forward-biased
- b. Reverse-biased
- c. Operating in the breakdown region
- d. Unbiased
8. In a loaded zener regulator, which has the largest current?
- a. Series current
- b. Zener current
- c. Load current
- d. None of these
9. If the load resistance decreases in a zener regulator, the zener current
- a. Decreases
- b. Stays the same
- c. Increases
- d. Equals the source voltage divided by the series resistance
10. If the load resistance decreases in a zener regulator, the series current
- a. Decreases
- b. Stays the same
- c. Increases
- d. Equals the source voltage divided by the series resistance
11. When the source voltage increases in a zener regulator, which of these currents remains approximately constant?
- a. Series current
- b. Zener current
- c. Load current
- d. Total current
12. If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to
- a. 0.7 V
- b. 10 V
- c. 14 V
- d. 18 V
13. At high frequencies, ordinary diodes don't work properly because of
- a. Forward bias
- b. Reverse bias
- c. Breakdown
- d. Charge storage
14. The capacitance of a varactor diode increases when the reverse voltage across it
- a. Decreases
- b. Increases
- c. Breaks down
- d. Stores charges
15. Breakdown does not destroy a zener diode provided the zener current is less than the
- a. Breakdown voltage
- b. Zener test current
- c. Maximum zener current rating
- d. Banier potential
16. To display the digit 8 in a seven-segment indicator,
- a. C must be lighted
- b. G must be off
- c. F must be on
- d. All segments must be on
17. A photodiode is normally
- a. Forward-biased
- b. Reverse-biased
- c. Neither forward- nor reverse biased
- d. Emitting light
18. When the light increases, the reverse minority carrier current in a photodiode
- a. Decreases
- b. Increases
- c. Is unaffected
- d. Reverses direction
19. The device associated with voltage-controlled capacitance is a
- a. Light-emitting diode
- b. Photodiode
- c. Varactor diode
- d. Zener diode
20. If the depletion layer gets wider, the capacitance
- a. Decreases
- b. Stays the same
- c. Increases
- d. Is variable
21. When the reverse voltage increases, the capacitance
- a. Decreases
- b. Stays the same
- c. Increases
- d. Has more bandwidth
22. The varactor is usually
- a. Forward-biased
- b. Reverse-biased
- c. Unbiased
- d. Operated in the breakdown region
23. The device to use for rectifying a weak ac signal is a
- a. Zener diode
- b. Light-emitting diode
- c. Varistor
- d. Back diode
24. Which of the following has a negative-resistance region?
- a. Tunnel diode
- b. Step-recovery diode
- c. Schottky diode
- d. Optocoupler
25. A blown-fuse indicator uses a
- a. Zener diode
- b. Constant-current diode
- c. Light-emitting diode
- d. Back diode
26. To isolate an output circuit from an input circuit, which is the device to use?
- a. Back diode
- b. Optocoupler
- c. Seven-segment indicator
- d. Tunnel diode
27. The diode with a forward voltage drop of approximately 0.25 V is the
- a. Step-recovery diode
- b. Schottky diode
- c. Back diode
- d. Constant-current diode
28. For typical operation, you need to use reverse bias with a
- a. Zener diode
- b. Photodiode
- c. Varactor
- d. All of the above
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