Navedtra 14179A Neets Module 7, Solid State Devices And Power Supplies

Front 1

What is a solid-state device?

Back 1

An electronic device that operates by virtue of the movement of electrons within a solid piece of semiconductor material

Front 2

Define the term negative temperature coefficient?

Back 2

The decrease in a semiconductors resistance as a temperature rises

Front 3

Name three of the largest users of semiconductor devices?

Back 3

Space system, computers, and data process equipment

Front 4

State one requirement of an electron tube, which does not exist for semi conductors, that makes the tube less efficient than the semiconductor?

Back 4

The electron tube requires filament or heater voltage, whereas the semiconductor device does not; consequently, no power input is spent by the semiconductor for conduction

Front 5

Define matter and list it's three different states?

Back 5

Anything that occupies space and has weight, liquid, solid, gas.

Front 6

What is the smallest particle into which an element can be broken down and still retain all its original properties?

Back 6

The atom

Front 7

What are the three particles that comprise an atom and state the type of charge they hold?

Back 7

Electrons-negative, protons-positive, neutrons-neutral.

Front 8

What is the outer shell of an atom called?

Back 8

Valence shell

Front 9

What term is described the definite discrete amounts of energy required to move an electron from a low shell to a higher shell?

Back 9

Quanta

Front 10

What is negative ion?

Back 10

A negatively charged atom having more than its normal amount of electrons

Front 11

What is the main difference in the energy arrangement between an isolated atom and the atom in a solid?

Back 11

The energy levels of an atom in a solid group together to form energy bands, whereas the isolated atom does not

Front 12

What determines, in terms of energy bands, whether a substance is a good insulator, semiconductor, or conducter?

Back 12

The width of the forbidden band

Front 13

What determines the chemical activity of an atom?

Back 13

The number of electrons in the valence shell

Front 14

What is the term used to described the sharing of valence electrons between two or more atoms?

Back 14

Covalent bonding

Front 15

Name the two type of current flow in a semiconductor?

Back 15

Electron flow ad hole flow

Front 16

What is the name given to a piece of pure semiconductor material that has an equal number of electrons and holes?

Back 16

Intrinsic

Front 17

What is the name given to a doped germanium crystal with an excess of free holes?

Back 17

P-type crystal

Front 18

What are the majority carriers in an N-type semiconductor?

Back 18

Electrons

Front 19

What is the purpose of a PNA junction diode?

Back 19

To convert AC to DC

Front 20

In reference to the schematic symbol for a diode, do electrons flow toward or away from the arrow?

Back 20

Towards

Front 21

What type of PN diode is formed by using a fine metal wire section of N-type semiconductor material?

Back 21

Point-contact

Front 22

What are the majority carriers in a P-type semiconductors?

Back 22

Holes

Front 23

Conduction in which type of semiconductor material is similar to conduction in a copper wire?

Back 23

N-type material

Front 24

In order to reverse bias in a PN junction, what terminal of a battery is connected to the P material?

Back 24

Negative

Front 25

What is the name of the area in a PN junction that has a shortage of electrons and holes?

Back 25

Depletion region

Front 26

What type of bias opposes the PN junction barrier?

Back 26

Forward

Front 27

What is a load?

Back 27

Any device that draws current

Front 28

What is the output of a half-wave rectifier?

Back 28

A pulsating DC voltage

Front 29

What type of rectifier is constructed by sandwiching a section of semiconductor material between two metal plates?

Back 29

Metallic rectifier

Front 30

What type of bias makes a diode act as closed switch?

Back 30

Forward bias

Front 31

What is to show how diode parameters vary over a full operating range?

Back 31

A characteristic curve

Front 32

What is meant by diode ratings?

Back 32

They are the limiting values of operating conditions outside which operations could cause diode damage

Front 33

What does the letter N indicates in the semiconductor identification system?

Back 33

A semiconductor

Front 34

What type of diode has orange, blue, and gray bands?

Back 34

IN368

Front 35

What type is the greatest threat to a diode?

Back 35

Heat

Front 36

When checking a diode with an ohmmeter, what is indicated by two high resistance measurements?

Back 36

The diode is open or has a high-forward resistance

Front 37

When applying 24 volts to A PN junction, you discover a large amount of resistance on the other side, what is this referred to as

Back 37

Reverse bias

Front 38

What converts AC voltage to DC voltage in an alternator

Back 38

Diodes, they rectify the current