Electronics Quiz

Question 1

What are the classifications of matter? (3)

Answer 1

Chemical
Physical
Electrical

Question 2

Chemical matter is broken down into what two groups?

Answer 2

Simple - atom
Complex - molecule

Question 3

Physical matter is broken down into what three groups?

Answer 3

Solid
Liquid
Gas

Question 4

Electrical matter is broken down into what three groups?

Answer 4

Conduction
Insulation
Semi-conduction

Question 5

Explain the composition of an atom including the polarity of each item?

Answer 5

Protons (pos)
Electrons (neg)
Neutrons (neut)

Question 6

Define simple matter

Answer 6

composed of one earth element

Question 7

Define complex matter

Answer 7

Two or more elements

Question 8

Give three examples of Insulators

Answer 8

Glass
Mica
Rubber

Question 9

Give three examples of conductors

Answer 9

Gold
Silver
Copper

Question 10

Give two examples of semi-conductors

Answer 10

Silicon
Germanium

Question 11

What are the shell levels of an atom called and how many electrons in each?

Answer 11

K - 2
L - 8
M - 18
N - 32

Question 12

What is the outer shell called?

Answer 12

Valence shell

Question 13

Explain what effects the electrical stability of an atom?

Answer 13

distance of the valence shell from the core - closer the more stable

Question 14

Semi-conductors have _______ valence electrons

Answer 14

4

Question 15

What is covalent bonding?

Answer 15

When electrons in the valence shell share 2 or more atoms

Question 16

A bond of silicone atoms forming a silicone crystal is said to be _________ material

Answer 16

instrinsic

Question 17

Explain the term doping

Answer 17

mixing intrinsic and extrinsic material

Question 18

Conduction in a pure crystal can only be achieved by exceeding certain levels of _________ and _________

Answer 18

heat and light

Question 19

What type of materials are added to semi-conductor material to form P type material? (4)

Answer 19

Gallium
Aluminum
Indium
Boron

Question 20

What type of materials are added to semi-conductor material to form N type material?

Answer 20

Phosphorus
Antimoni
Arsenic

Question 21

What are the majority carriers in P type material?

Answer 21

Holes

Question 22

What are the majority carriers in N type material?

Answer 22

electrons

Question 23

Explain what is meant by the term conventional flow?

Answer 23

Electron flow positive to negative

Question 24

Explain what is meant by the term electron flow?

Answer 24

electron flow negative to positive

Question 25

What happens when a piece of N type semi-conductor material and a piece of P type semi-conductor material are joined?

Answer 25

Combines until a depletion region is formed

Question 26

What is the material that joins n type and p type called?

Answer 26

junction diode

Question 27

How is the depletion region overcome?

Answer 27

applying knee voltage

Question 28

What is the barrier potential for silicon and germanium semi-conductor material are joined?

Answer 28

Silicon = .7v Germanium = .3v

Question 29

Explain what is meant by saying a diode is forward bias?

Answer 29

Diode is conducting

Question 30

Explain what is meant by saying a diode is reverse bias?

Answer 30

diode is not conducting

Question 31

What is VBR?

Answer 31

Voltage breakdown reverse is the point at which most diodes will be destroyed

Question 32

What does VK mean?

Answer 32

knee voltage

Question 33

What is the purpose of a power supply?

Answer 33

To provide a constant dc voltage to circuits

Question 34

What are the 4 major components that make up a power supply?

Answer 34

transformers rectifiers filters regulators

Question 35

What are the components used in a power supply filter and why do they improve the output? (3)

Answer 35

capacitors inductors resistors

Question 36

What will determine the type of filter used?

Answer 36

Requirements of the load

Question 37

What is the purpose of a voltage regulator?

Answer 37

provide constant voltage to the load

Question 38

How does a zenner diode differ from a junction diode?

Answer 38

designed to operate in reverse bias

Question 39

What are the two types of breakdown associated with a zenner? What are their voltage ranges?

Answer 39

Zenner - 0 to 6v Avalanche - 6v and greater

Question 40

The majority of zenner's operate on __________ breakdown

Answer 40

avalanche

Question 41

What factor will decide the voltage rating of a zenner diode?

Answer 41

doping

Question 42

What are three applications of a zenner diode?

Answer 42

voltage regulation peak limiter overload protection

Question 43

What is an LED and how does it operate?

Answer 43

light emitting diode

Question 44

What is a photo diode and how does it operate?

Answer 44

light deception that goes f.b when exposed to light

Question 45

What is a triac and how does it operate?

Answer 45

3 terminal bi-direction device used to control ac power

Question 46

What is a diac and how does it operate?

Answer 46

It is a bi-directional device with no gate used as a triggering device for triacs

Question 47

What is an optocoupler?

Answer 47

Isolation device that consists of an LED and a photodiode functions like a coil and contact

Question 48

What is thermistor?

Answer 48

thermal sensitive resistor

Question 49

Explain the term RTD and give an example?

Answer 49

Resistive temp device

Question 50

What types of input signals are used in electronic control systems? (2)

Answer 50

Analog Digital

Question 51

Explain proportion control?

Answer 51

Varying response to input signal

Question 52

Explain proportion-integral control?

Answer 52

adjusted response to input signal - tries to correct response to match s.p

Question 53

What is a transducer?

Answer 53

device that converts a signal from one type to another

Question 54

What forces keep electrons in their orbit? (2)

Answer 54

Magnetic Kinetic

Question 55

Why is an atom considered to be in a neutral state when it is by itself?

Answer 55

same # of electrons and protons