 Floyd Self-test in Special-Purpose Diodes

(Last Updated On: December 8, 2017) This is the Self-test in Chapter 3: Special-Purpose Diodes from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Floyd Self-test Chapter 3 Topic Outline

• Floyd Self-test in The Zener Diode
• Floyd Self-test in Zener Diode Applications
• Floyd Self-test in The Varactor Diode
• Floyd Self-test in Optical Diodes
• Floyd Self-test in Other Types of Diodes

Stat Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. The cathode of a zener diode in a voltage regulator is normally

• (a) more positive than the anode
• (b) more negative than the anode
• (c) at +0.7 V
• (d) grounded

2. If a certain zener diode has a zener voltage of 3.6 V, it operates in

• (a) regulated breakdown
• (b) zener breakdown
• (c) forward conduction
• (d) avalanche breakdown

3. For a certain 12 V zener diode, 10mA change in zener current produces a 0.1 V change in zener voltage. The zener impedance for this current range is

• (a) 1Ω
• (b) 100Ω
• (c) 10Ω
• (d) 0.1Ω

4. The datasheet for particular zener gives Vz = 10V at Iz = 500 mA. Zz for these condition is

• (a) 50 Ω
• (b) 20 Ω
• (c) 10 Ω
• (d) unknown

5. A no-load condition means that

• (a) the load has infinite resistance
• (b) the load has zero resistance
• (c) the output terminals are open
• (d) answers(a) and (c)

6. A varactor diode exhibits

• (a) a variable capacitance that depends on reverse voltage
• (b) a variable resistance that depends on reverse voltage
• (c) a variable capacitance that depends on forward current
• (d) a constant capacitance over a range of reverse voltages

7. An LED

• (a) emits light when reverse-biased
• (b) senses light when reverse-biased
• (c) emits light when forward-biased
• (d) acts as a variable resistance

8. Compared to a visible red LED, an infrared LED

• (a) produces light with shorter wavelengths
• (b) produces light of all wavelengths
• (c) produces only one color of light
• (d) produces light with longer wavelengths

9. Compared to incandescent bulbs, high-intensity LEDs

• (a) are brighter
• (b) have a much longer life
• (c) use less power
• (d) all of the above

10. An OLED differs from a conventional LED in that it

• (a) requires no bias voltage
• (b) as layers of organic material in the place of a pn junction
• (c) can be implemented using an inkjet printing process
• (d) both (b) and (c)

11. An infrared LED is optically coupled to a photodiode. When the LED is turned off, the reading on an ammeter in series with the reverse-biased photodiode will

• (a) not change
• (b) decrease
• (c) increase
• (d) fluctuate

12. The internal resistance of a photodiode

• (a) increases with light intensity when reverse-biased
• (b) decreases with light intensity when reverse-biased
• (c) increases with light intensity when forward-biased
• (d) decreases with light intensity when forward-biased

13. A laser diode produces

• (a) incoherent light
• (b) coherent light
• (c) monochromatic light
• (d) both (b) and (c)

14. A diode that has a negative resistance characteristic is the

• (a) Schottky diode
• (b) tunnel diode
• (c) laser diode
• (d) hot-carrier diode

15. In order for a system to function properly, the various types of circuits that make up the system must be

• (a) properly biased
• (b) properly connected
• (c) properly interfaced
• (d) all of the above
• (e) answers(a) and (b)