Chararicteristics Of Semiconductors

Question 1

What makes a material classified as a conductor, insulator or a semiconductor

Answer 1

The number or valence electrons
Conductors = 1-3
Insulator = 5 or more
Semiconductor = 4

Question 2

What are Two semiconductor elements

Answer 2

Germanium and silicon

Question 3

Valence electrons adjoining atoms in a crystal-lattice structure is called

Answer 3

Covalent bonding

Question 4

What is doping

Answer 4

Adding or taking away elections

Question 5

Semiconductor have a __________ temperature coefficient of resistance

Answer 5

Negative

Question 6

What mounting device is used for semiconductors to dissipate heat

Answer 6

Heat sink

Question 7

Why is silicon more common used then germanium for semiconductor devices

Answer 7

Silicon can withstand higher temperature

Question 8

The anode of a diode is made of what types of semiconductors

Answer 8

P,N

Question 9

Reverse bias is when an annoyed is negative or positive

Answer 9

Negative

Question 10

The forward voltage drop across a silicon diode measures at what number

Answer 10

0.7 V

Question 11

In the symbol for a diode the arrow represents what —|<|

Answer 11

The anode

Question 12

When a diode is forward based electrons flow from ?

Answer 12

Cathode to anode

Question 13

What’s the difference between a zener diode and a conventional rectifier diode

Answer 13

Zener diodes operate with reverse bias as the voltage regulator.

Conventional diode is intended to operate only with forward bias

Question 14

What is zener voltage

Answer 14

Its the voltage across the Zener when it operates

Question 15

When using a Zener diode as a D.C voltage regulator, what three condition must be satisfied

Answer 15

1, Connected in reverse bias 2, have a voltage rating lower then the source voltage 3, have a stabilizing resistor connected in series to limit the current

Question 16

PIV rating in a light-emitting diode is __________
V maximum

Answer 16

6v

Question 17

What does an LED need to be when it operates

Answer 17

Forward bias

Question 18

When using illuminance characteristics of photodiodes in circuit operations how does a diode need to be connected

Answer 18

Reverse bias

Question 19

Since the reverse currents of photodiodes are so small, what must be amplified

Answer 19

Transistors

Question 20

What colour LED has the highest voltage drop when conducting

Answer 20

Green

Question 21

What does PIV mean

Answer 21

Peak inverse voltage

Question 22

What dose NPN mean

Answer 22

Not pointing in

Question 23

What does PNP mean

Answer 23

Pointing in permanently

Question 24

What does E-B-C mean

Answer 24

Emitter-bass-collecter

Question 25

Three significant ratings associated with rectifier diodes

Answer 25

Forward current Forward voltage Low PIV

Question 26

What is the name given to a diode used for ARC suppression

Answer 26

Free wheeling

Question 27

Two typical ratings associated with Zener diodes

Answer 27

1, Zener watts 2, Zener volts

Question 28

What happens when a depletion region is connected in reverse bias

Answer 28

It gets bigger in size and higher in resistance

Question 29

What happens when a depletion region is connected in forward bias.

Answer 29

It gets smaller in size so lower resistance

Question 30

What are two basic porpoises of transistors

Answer 30

1, To turn on and off 2, to amplify

Question 31

What does BJT mean

Answer 31

Bipolar junction transistor

Question 32

What does a BJT doo

Answer 32

Uses holes and electrons as current carriers

Question 33

What does a transistor do

Answer 33

Turns a little bit of power into a lot of

Question 34

Saturation

Answer 34

When the transistor is fully on

Question 35

Transistor Cut off is what ?

Answer 35

When the base current is reduce to zero or the base current is open

Question 36

What are semi conductors properties

Answer 36

They form a lattice structure

Question 37

What is it called when a transistor is fully on

Answer 37

Saturated

Question 38

Zener diodes have to be what way when conducting

Answer 38

Ravers bias