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# Floyd Self-test in Special-Purpose Diodes

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

If you are looking for the Multiple Choice Questions in Floyd’s Electronic Devices proceed to

#### 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

Solution:

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

Solution:

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

(a) 1โฆ

(b) 100โฆ

(c) 10โฆ

(d) 0.1โฆ

Solution:

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

(a) 50 โฆ

(b) 20 โฆ

(c) 10 โฆ

(d) unknown

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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)

Solution:

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

Solution:

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

Solution:

13. A laser diode produces

(a) incoherent light

(b) coherent light

(c) monochromatic light

(d) both (b) and (c)

Solution:

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

(a) Schottky diode

(b) tunnel diode

(c) laser diode

(d) hot-carrier diode

Solution:

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

Solution:

### Complete List of Floyd Self-test in Electronic Devices

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