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.
d
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-cuffent device.
d. It works in the forward region.
b
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
b
4. The voltage across the zener resistance is usually
a. Small
b. Large
c. Measured in volts
d. Subtracted from the breakdown voltage
a
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
c
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
c
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
c
8. In a loaded zener regulator, which is the largest current?
a. Series current
b. Zener current
c. Load current
d. None of these
a
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
a
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
b
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
c
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
a
13. At high frequencies, ordinary diodes don't work properly because of
a. Forward bias
b. Reverse bias
c. Breakdown
d. Charge storage
d
14. The capacitance of a varactor diode increases when the reverse voltage across it
a. Decreases
b. Increases
c. Breaks down
d. Stores charges
a
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
c
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
d
17. A photodiode is normally
a. Forward-biased
b. Reverse-biased
c. Neither forward- nor reverse-biased
d. Emitting light
b
18. When the light increases, the reverse minority carrier current in a photodiode
a. Decreases
b. Increases
c. Is unaffected
d. Reverses direction
b
19. The device associated with voltage-controlled capacitance is a
a. Light-emitting diode
b. Photodiode
c. Varactor diode
d. Zener diode
c
20. If the depletion layer gets wider, the capacitance
a. Decreases
b. Stays the same
c. Increases
d. Is variable
a
21. When the reverse voltage increases, the capacitance
a. Decreases
b. Stays the same
c. Increases
d. Has more bandwidth
a
22. The varactor is usually
a. Forward-biased
b. Reverse-biased
c. Unbiased
d. Operated in the breakdown region
b
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
d
24. Which of the following has a negative-resistance region?
a. Tunnel diode
b. Step-recovery diode
c. Schottky diode
d. Optocoupler
a
25. A blown-fuse indicator uses a
a. Zener diode
b. Constant-cuffent diode
c. Light-emitting diode
d. Back diode
c
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
b
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
b
28. For typical operation, you need to use reverse bias with a
a. Zener diode
b. Photodiode
c. Varactor
d. All of the above
d
this seems like a great questionnaire for electronic students. Teachers can easily use this. Even the students who wish to go sincere should check it out.
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