Element #3E....Good luck!...and remember you will be asked 10 questions from this pool.

1. (E3E1) Structurally, what are the two main categories of semiconductor diodes?
   

   1.   ?    Junction and point contact.
   2.   ?    Electrolytic and junction.
   3.   ?    Electrolytic and point contact.
   4.   ?    Vacuum and point contact.

2. (E3E2) What are the two primary classifications of Zener diodes?
   

   1.   ?    Hot carrier and tunnel.
   2.   ?    Varactor and rectifying.
   3.   ?    Voltage regulator and voltage reference.
   4.   ?    Forward and reversed biased.

3. (E3E3) What is the principal characteristic of a Zener diode?
   

   1.   ?    A constant current under conditions of varying voltage.
   2.   ?    A constant voltage under conditions of varying current.
   3.   ?    A negative resistance region.
   4.   ?    An internal capacitance that varies with the applied voltage.

4. (E3E4) What is the range of voltage ratings available in Zener diodes?
   

   1.   ?    2.4 volts to 200 volts.
   2.   ?    1.2 volts to 7 volts.
   3.   ?    3 volts to 2000 volts.
   4.   ?    1.2 volts to 5.6 volts.

5. (E3E5) What is the principal characteristic of a tunnel diode?
   

   1.   ?    A high forward resistance.
   2.   ?    A very high PIV(peak inverse voltage).
   3.   ?    A negative resistance region.
   4.   ?    A high forward current rating.

6. (E3E6) What special type of diode is capable of both amplification and oscillation?
   

   1.   ?    Point contact diodes.
   2.   ?    Zener diodes.
   3.   ?    Tunnel diodes.