Multiple Choice Questions Topic Outline
- MCQs in The Zener Diode
- MCQs in Zener Diode Applications
- MCQs in The Varactor Diode
- MCQs in Optical Diodes
- MCQs in Other Types of Diodes
- MCQs in GreenTech Application 3: Solar Power
Begin and Good luck!
1. The process of emitting photons from a semiconductive material is called
- A) photoluminescence.
- B) gallium arsenide.
- C) electroluminescence.
- D) gallium phosphide.
2. The normal operating region for a zener diode is the
- A) forward-bias region.
- B) reverse-bias region.
- C) zero-crossing region.
- D) reverse-breakdown region.
3. Schottky diodes are also known as
- A) PIN diodes.
- B) hot carrier diodes.
- C) step-recovery diodes.
- D) tunnel diodes.
4. A laser diode normally emits
- A) coherent light.
- B) monochromatic light.
- C) coherent and monochromatic light.
- D) neither coherent nor monochromatic light.
5. An 8.2 V zener has a resistance of 5 Ω. The actual voltage across its terminals when the current is 25 mA is
- A) 8.2 V.
- B) 125 mV.
- C) 8.325 V.
- D) 8.075 V.
6. A 6.2 V zener is rated at 1 watt. The maximum safe current the zener can carry is
- A) 1.61 A.
- B) 161 mA.
- C) 16.1 mA.
- D) 1.61 mA.
7. Refer to Figure 3-1. If the load current increases, IR will _____ and IZ will _____.
Figure 3-1
- A) remain the same, increase
- B) decrease, remain the same
- C) increase, remain the same
- D) remain the same, decrease
8. Refer to Figure 3-1. If VIN attempts to increase, VR will
- A) increase.
- B) decrease.
- C) remain the same.
9. Refer to Figure 3-1. If VIN increases, IZ will
- A) increase.
- B) decrease.
- C) remain the same.
10. Refer to Figure 3-1. If VIN decreases, IR will
- A) increase.
- B) decrease.
- C) remain the same.
11. Refer to Figure 3-2. Identify the Schottky diode.
Figure 3-2
- A) a
- B) b
- C) c
- D) d
- E) e
12. Refer to Figure 3-2. Which symbol is correct for a zener diode?
- A) a
- B) b
- C) c
- D) d
- E) e
13. Refer to Figure 3-2. Find the tunnel diode symbol.
- A) a
- B) b
- C) c
- D) d
- E) e
14. Refer to Figure 3-2. Which symbol is correct for a photodiode?
- A) a
- B) b
- C) c
- D) d
- E) e
15. Refer to Figure 3-2. Which symbol is correct for an LED?
- A) a
- B) b
- C) c
- D) d
- E) e
16. An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be
- A) the diode is open.
- B) the series resistor is too small.
- C) none. The diode should be off if forward-biased.
- D) the power supply voltage is too high.
17. The Schottky diode is used
- A) in high-power circuits.
- B) in circuits requiring negative resistance.
- C) in very fast-switching circuits.
- D) in power supply rectifiers.
18. A tunnel diode is used
- A) in high-power circuits.
- B) in circuits requiring negative resistance.
- C) in very fast-switching circuits.
- D) in power supply rectifiers.
19. You have an application for a diode to be used in a tuning circuit. A type of diode to use might be
- A) an LED.
- B) a Schottky diode.
- C) a Gunn diode.
- D) a varactor.
20. Zener diodes with breakdown voltages less than 5 V operate predominantly in what type of breakdown?
- A) avalanche
- B) zener
- C) varactor
- D) Schottky
21. Zener diodes with breakdown voltages greater than 5 V operate predominantly in what type of breakdown?
- A) avalanche
- B) zener
- C) varactor
- D) Schottky
22. What type of diode is commonly used in electronic tuners in TVs?
- A) varactor
- B) Schottky
- C) LED
- D) Gunn
23. A varactor is a pn junction diode that always operates in _____-bias and is doped to _____ the inherent capacitance of the depletion region.
- A) forward, maximize
- B) reverse, maximize
- C) reverse, minimize
- D) forward, minimize
24. LEDs are made out of
- A) silicon.
- B) germanium.
- C) gallium.
- D) silicon and germanium, but not gallium.
25. What type of diode maintains a constant current?
- A) LED
- B) zener
- C) current regulator
- D) pin
- E) none of the above
26. What diode operates only with majority carriers?
- A) laser
- B) tunnel
- C) Schottky
- D) step-recovery
27. What kind of diode is formed by joining a doped semiconductor region with a metal?
- A) laser
- B) tunnel
- C) pin
- D) Schottky
28. Which diode employs graded doping?
- A) zener
- B) LED
- C) tunnel
- D) step-recovery
29. What diode is used in seven-segment displays?
- A) zener
- B) LED
- C) laser
- D) Schottky
30. Back-to-back varactor diodes are used for what reason?
- A) over-voltage protection
- B) a wider tuning range
- C) to eliminate harmonic distortion
- D) no reason; only zeners are used in a back-to-back configuration
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