Semi-conductors

Question 1

Schematic designation for diode

Answer 1

C, or D

Question 2

Most used semiconductors

Answer 2

Germanium and silicon

Question 3

Process of adding impurities to semi-conductor material

Answer 3

Doping

Question 4

Electrons

Answer 4

N type material

Question 5

Holes

Answer 5

P type material

Question 6

Where p and n material meet is called the…

Answer 6

PN Junction

Question 8

Narrow area of recombination across PN junction.(no mobile carriers present)

Answer 8

Depletion region

Question 9

Electrostatic field caused by ions formed through recombination in the depletion region

Answer 9

Barrier potential

Question 10

Silicon requires_to_volts to overcome barrier potential

Answer 10

.6,.7

Question 11

Germanium requires

Answer 11

.2 to .3 v

Question 12

Point where excessive reverse bias voltage causes bonds in the depletion region to break apart

Answer 12

Breakdown

Question 13

Breakdown below 6vdc is called…

Answer 13

Zener effect

Question 14

Breakdown above 6vdc is called…

Answer 14

Avalanche effect

Question 15

Types of diodes

Answer 15

Junction, Leds, zener

Question 16

Only allows current to flow in one direction ( if put in reverse bias diode acts like a open switch)

Answer 16

Junction diode

Question 17

Primarily used in voltage regulators

Answer 17

Zener diode

Question 18

Zener diode must be placed in … to operate properly. If put in … bias it operates as a junction diode

Answer 18

Reverse bias, forward bias

Question 19

Does LED have filament?

Answer 19

No

Question 20

LEDs are emitted in the form of…

Answer 20

Photons

Question 21

A four layer, two electrode semiconductor diode used for producing trigger pulses

Answer 21

Shockley diode

Question 22

Is essentially a Shockley diode with an electrode connected to the internal p material

Answer 22

Silicon Controlled rectifier

Question 23

SCR is used to generate…

Answer 23

Sharp trigger pulses

Question 24

Used to switch, control or amplify an electrical signal

Answer 24

Transistor

Question 25

Heavily doped

Answer 25

Emitter

Question 26

Lightly doped

Answer 26

Base

Question 27

Moderately doped

Answer 27

Collector

Question 28

Increasing the … too much causes the transistor to go into saturation causing the collector current to no longer increase

Answer 28

Base bias

Question 29

Used as amplifiers and electronic switches

Answer 29

Transistors

Question 30

Uses a electrostatic field to control current flow

Answer 30

JFETS

Question 31

Gate is insulated from the channel by a thin layer of silicon dioxide Leads to high input resistance and virtually no input current

Answer 31

MOSFET

Question 32

Normally on but must be biased off

Answer 32

Depletion MOSFET

Question 33

Normally off but must be biased on

Answer 33

Enhancement MOSFET

Question 34

Electrostatic Discharge

Answer 34

Hazard to MOSFET