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Term 3 - Main. Computer Environment Systems > Electronics Quiz > Flashcards

Electronics Quiz Flashcards

1
Q

What are the classifications of matter? (3)

A

Chemical
Physical
Electrical

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2
Q

Chemical matter is broken down into what two groups?

A

Simple - atom
Complex - molecule

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3
Q

Physical matter is broken down into what three groups?

A

Solid
Liquid
Gas

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4
Q

Electrical matter is broken down into what three groups?

A

Conduction
Insulation
Semi-conduction

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5
Q

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

A

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

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6
Q

Define simple matter

A

composed of one earth element

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7
Q

Define complex matter

A

Two or more elements

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8
Q

Give three examples of Insulators

A

Glass
Mica
Rubber

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9
Q

Give three examples of conductors

A

Gold
Silver
Copper

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10
Q

Give two examples of semi-conductors

A

Silicon
Germanium

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11
Q

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

A

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

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12
Q

What is the outer shell called?

A

Valence shell

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13
Q

Explain what effects the electrical stability of an atom?

A

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

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14
Q

Semi-conductors have _______ valence electrons

A

4

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15
Q

What is covalent bonding?

A

When electrons in the valence shell share 2 or more atoms

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16
Q

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

A

instrinsic

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17
Q

Explain the term doping

A

mixing intrinsic and extrinsic material

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18
Q

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

A

heat and light

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19
Q

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

A

Gallium
Aluminum
Indium
Boron

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20
Q

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

A

Phosphorus
Antimoni
Arsenic

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21
Q

What are the majority carriers in P type material?

A

Holes

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22
Q

What are the majority carriers in N type material?

A

electrons

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23
Q

Explain what is meant by the term conventional flow?

A

Electron flow positive to negative

24
Q

Explain what is meant by the term electron flow?

A

electron flow negative to positive

25
Q

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

A

Combines until a depletion region is formed

26
Q

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

A

junction diode

27
Q

How is the depletion region overcome?

A

applying knee voltage

28
Q

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

A

Silicon = .7v

Germanium = .3v

29
Q

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

A

Diode is conducting

30
Q

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

A

diode is not conducting

31
Q

What is VBR?

A

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

32
Q

What does VK mean?

A

knee voltage

33
Q

What is the purpose of a power supply?

A

To provide a constant dc voltage to circuits

34
Q

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

A

transformers
rectifiers
filters
regulators

35
Q

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

A

capacitors
inductors
resistors

36
Q

What will determine the type of filter used?

A

Requirements of the load

37
Q

What is the purpose of a voltage regulator?

A

provide constant voltage to the load

38
Q

How does a zenner diode differ from a junction diode?

A

designed to operate in reverse bias

39
Q

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

A

Zenner - 0 to 6v

Avalanche - 6v and greater

40
Q

The majority of zenner’s operate on __________ breakdown

A

avalanche

41
Q

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

A

doping

42
Q

What are three applications of a zenner diode?

A

voltage regulation
peak limiter
overload protection

43
Q

What is an LED and how does it operate?

A

light emitting diode

44
Q

What is a photo diode and how does it operate?

A

light deception that goes f.b when exposed to light

45
Q

What is a triac and how does it operate?

A

3 terminal bi-direction device used to control ac power

46
Q

What is a diac and how does it operate?

A

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

47
Q

What is an optocoupler?

A

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

48
Q

What is thermistor?

A

thermal sensitive resistor

49
Q

Explain the term RTD and give an example?

A

Resistive temp device

50
Q

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

A

Analog
Digital

51
Q

Explain proportion control?

A

Varying response to input signal

52
Q

Explain proportion-integral control?

A

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

53
Q

What is a transducer?

A

device that converts a signal from one type to another

54
Q

What forces keep electrons in their orbit? (2)

A

Magnetic
Kinetic

55
Q

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

A

same # of electrons and protons

Term 3 - Main. Computer Environment Systems (4 decks)

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