Learning Hub Quiz

Question 1

Name three electrical classifications

Answer 1

conductor
insulator
semi conductor

Question 2

What is the valence shell?

Answer 2

outermost shell

Question 3

How many electrons are there in a GE atoms valence shell?

Answer 3

4

Question 4

Name two types of semi conductors.

Answer 4

silicon and germanium

Question 5

Name three clasifications of matter.

Answer 5

chemical, physical, electrical

Question 6

How many electrons are in a silicone atom?

Answer 6

14

Question 7

What determines the electrical stability of an atom?

Answer 7

how close valence shell is to core

Question 8

What is an intrinsic material?

Answer 8

pure material (p type)

Question 9

Which semi conductor is more stable and why?

Answer 9

silicon because valence shell is closer

Question 10

What term is used to describe when electrons in the valence shell are shared between two or more atoms?

Answer 10

covalent bonding

Question 11

Name three physical classifications of matter

Answer 11

solid
liquid
gas

Question 12

Define complex matter.

Answer 12

two basic earth materials

Question 13

How many electrons in the valence shell of a SI molecuele?

Answer 13

4

Question 14

How is a silicone crystal formed l and what is it’s charge?

Answer 14

through covalent bonding and has a neutral charge

Question 15

What is doping and why is it done?

Answer 15

Adding impurities to increase conductivity

Question 16

An impurity with five electrons in its valence shell is called what?
what is the over all charge?

Answer 16

pentavalent

pos

Question 17

How many electrons are in the valence shell of a “p” type material

Answer 17

4

Question 18

What is the difference between an N type semi conductor and a P type semi conductor?
what is the overall charge of each?

Answer 18

N type = free electrons (neutral)

P type= holes (neutral)

Question 19

Name 4 impurities used in a “P” type semi conductor?

Answer 19

Gallium
Aluminum
Indium
Boron

Question 20

Name three impurites used in an “N” type semi conductor?

Answer 20

Phosphorus
Antimoni
Arsenic

Question 21

In what direction does the hole apear to move in a “P” type semi conductor?
what direction does the current flow?

Answer 21

neg to pos

Question 22

What direction does current flow in an “N” type semi conductor?
What are the free electrons called?

Answer 22

neg to pos

holes

Question 23

what is the construction of a diode?

Answer 23

joining p type and n type material

Question 24

What is the area between the “P” and “N” on the diode called?

Answer 24

depletion region

Question 25

What type of material is the anode made of?
What type of material is the cathode made of?

Answer 25

P type and N type

Question 26

What is knee voltage?
what is the knee voltage for si and ge?

Answer 26

cut in voltage

0.7SI and 0.3GE

Question 27

When there is a negative voltage aplied to the “P” junction what Bias is the diode in?
What hapens to the depletion region?

Answer 27

Reverse bias, it grows

Question 28

what polarity is the voltage applied to the cathode to cause it to be forward bias?

Answer 28

negative

Question 29

What is PIV?

Answer 29

Peak inverse voltage

Question 30

What component is added to a diode when voltage is incresed dureing forwad bias?

Answer 30

heat sink

Question 31

What term is used when to much voltage is aplied when in reverse bias and what will happen to the diode?

Answer 31

Voltage breakdown reverse / avalanche

Question 32

what is a way of marking the cathode on a diode?

Answer 32

Vertical bar indicates cathode (neg)

Question 33

What is a common diode used in every day life that every one is familiar with?

Answer 33

LED

Question 34

What is VBR

Answer 34

Voltage breakdown reverse - diode conducts too much and destroys itself