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B1 Modules > Module 4 > Flashcards

Module 4 Flashcards

1
Q

What are the most important elements used for semiconductors

A

Silicone, germanium, selenium and copper oxide

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2
Q

What is doping

A

Moving electrons and holes

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3
Q

What is known about p type material

A

Number of electrons trapped is lower resulting in more holes

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4
Q

How is a single crystal semiconductor diode made

A

By doping two semiconductor p-n crystals together

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5
Q

Does a semiconductor diode block current or let it through

A

It can do either

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6
Q

How much voltage is required to break down the depletion zone in a silicone diode

A

0.7V

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7
Q

What is the threshold voltage

A

A voltage above the depletion zone voltage

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8
Q

What semiconductor diode is reverse biased current leakage the greatest

A

Germanium diodes

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9
Q

What is the maximum forward current

A

Quite literally the maximum forward current allowed to flow through the device

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10
Q

What happens If IFMAX is exceeded

A

More heat will be generated and could result in destruction

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11
Q

What is recommended if running diodes close to current capacity

A

Provide additional cooling

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12
Q

What are the 3 types of semiconductor diodes

A

Microdiodes, rectifier diodes and heavy current diodes.

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13
Q

What is diffusion voltage in germanium

A

0.3v

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14
Q

What is the diffusion voltage in silicon

A

0.7v

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15
Q

Charge displacement cannot be used where

A

Batteries

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16
Q

What is a fundamental semiconductor diode

A

A p-n diode

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17
Q

Can a semiconductor diode block current or let it through

A

It can block current or let it through

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18
Q

What is described as a type of valve for electrical current

A

A semiconductor diode

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19
Q

Where would you find microdiodes mainly used

A

In communication technology

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20
Q

Where would you see rectifier diodes

A

Electrical power supply devises

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21
Q

Where would heavy current diodes be used

A

Rectifier circuits for large loads

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22
Q

What type of diodes can be used to protect against back EMF

A

Freewheeling diodes

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23
Q

When diodes are connected in series what will the forward current be

A

The same as the current going in

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24
Q

When diodes are connected in parallel what happens to the current

A

It’s divided between the diodes

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25
Q

What will happen if a diode is wired in a reverse bias direction

A

Very high resistance or short circuit

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26
Q

What will a diode show if wired in bias direction

A

Very low resistance

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27
Q

What can diodes resistance be measured with

A

A multimeter

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28
Q

When a multimeter is set to the testing diode setting how much voltage will be supplied

A

2.5-3.5v

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29
Q

What will a serviceable diodes voltage show on a multimeter when tested in the forward bias direction

A

0.6- 0.7v

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30
Q

What will a multimeter show when a diode is tested in the reverse bias direction

A

Overload OL

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31
Q

How can you tell If a diode has failed OPEN circuit

A

It will indicate overload or OL on a multimeter in both forward bias and reverse bias

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32
Q

What will happen when a diode has failed SHORT circuit

A

It will show 0 in both directions and an audible beep is heard

33
Q

What is the angle of opening in a diode charging

A

30 to 60 degrees

34
Q

What are the two things a semiconductor diode can do to current

A

Block it or let it through

35
Q

How are P and N type materials created

A

Doping

36
Q

What is the area between P and N type materials called

A

Depletion later

37
Q

In reverse biased config does a diode block or conduct

A

Blocks

38
Q

What is the voltage that breaks through a depletion zone in fwd bias condition called

A

Threshold voltage

39
Q

What are the threshold voltages for silicon and germanium

A

Germanium 0.3
Silicon 0.7

40
Q

Do diodes block completely in reverse bias

A

No depends on semiconductor type

41
Q

What is residual reverse biased current also known as

A

Current caused by impurities in the Chrystal

42
Q

Which diode has a higher breakdown voltage silicone or germanium

A

Silicon

43
Q

What temp can silicon and germanium withstand

A

Silicon 180 degrees c
Germanium 80 degrees c

44
Q

When testing a diode with a multimeter what voltage would you expect in the forward and reverse bias directions if the diode was serviceable

A

Fwd 0.7v
Rev batt volt assume si

45
Q

How many diodes are required for a single wave rectifier

A

One

46
Q

In a 3 phase rectifier how many diodes are required

A

6

47
Q

What is the advantage of a bridge rectifier over a full wave rectifier

A

Does not need a transformer

48
Q

How is the zenner diode normally connected

A

In the reverse biased direction

49
Q

What is the zenner diode typically used for

A

Voltage regulation

50
Q

What is the effect called when a reverse biased zenner diode suddenly starts conducting

A

The zenner effect

51
Q

What is the optimum voltage for a zenner diode and why

A

Breakdown voltage between 5 and 7v this means the dynamic resistance is especially small

52
Q

What determines the operating voltage of a zenner diode

A

The amount of dopant

53
Q

What determines the light colour from an LED

A

Depends on the semiconductor material used

54
Q

What is the lifespan of an LED

A

6 to 11 Years

55
Q

What is the relationship between light and resistance of a LDR

A

Increased light - decreased resistance

56
Q

What are the resistance characteristics of PTCs

A

Temp increase resistance increase

57
Q

What are the characteristics of NTCs

A

Temp increase resistance decrease

58
Q

What is the temperature at which the resistance of a PTC sudden you increases called

A

Reference temperature

59
Q

What are VDRs used for

A

Protect systems against high voltage

60
Q

How many P N layers does a thyristor have

A

4

61
Q

How many junctions does a thyristor have

A

3

62
Q

When does a thyristor conduct

A

When zero sweep voltage is exceeded

63
Q

With no voltage at the gate what is the voltage called that makes a thyristor suddenly conduct

A

Zero sweep voltage

64
Q

How is a thyristor turned off

A

Switch the circuit off completely

65
Q

What sort of current does a thyristor control

A

High current

66
Q

What sort of current does a triad control

A

AC

67
Q

How many layers does a bi polar transistor have

A

3

68
Q

What are the 3 terminals of a transistor called

A

Base
Collector
Emitter

69
Q

Between which terminals is a transistor controlled

A

Base/emitter

70
Q

In which devices can integrated circuits be found. Alalouge digital or both

A

Both

71
Q

Which components can be found in ICs

A

Transistors
Capacitors
Resistors

72
Q

What are the benefits of ICs

A

Small
Cheap
Low power consumption

73
Q

What are the disadvantages of ICs

A

Heat
Difficult to maintain

74
Q

What does LDR stand for

A

Light Dependant Resistor

75
Q

What does VDR stand for

A

Voltage Dependent Resistor

76
Q

What is a thyristor diode

A

A four layer diode consisting of four semiconductor zones with an anode terminal and a cathode terminal

77
Q

How many P N junctions are there in a thyristor

A

3

78
Q

What does SCR stand for

A

Silicon Controlled Rectifier

79
Q

What is

A

B1 Modules (19 decks)

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