M4

Front 1

A silicon diode, compared to a germanium diode has a higher or lower forward bias voltage?

Back 1

Higher

Front 2

Which diode stabilises voltage at a predetermined level?

Back 2

Zener

Front 3

How many pn junctions does a junction diode have?

Back 3

One

Front 4

How does reverse bias effect the depletion layer?

Back 4

Increases it

Front 5

To check the FORWARD resistance of a diode with a multimeter, the lead connected to the positive terminal is put to the-

Back 5

Anode

Front 6

What diode has high resistance when turned off?

Back 6

Thyristor

Front 7

An LED's colour depends on how the material is-

Back 7

Doped

Front 8

Pentevalent atoms are of what type material?

Back 8

N-type

Front 9

An SCR is used for-

Back 9

Rectification

Front 10

Gate, cathode and anode are electrodes of what component?

Back 10

An SCR

Front 11

A silicon diode's forward voltage is?

Back 11

Approximately 0.7V

Front 12

What is the typical voltage drop across an LED?

Back 12

1.6V

Front 13

An LED emits when in -

Back 13

Forward bias

Front 14

A diode had an anode connected to a 6V supply whilst its cathode is connected to a 1V supply. What bias is it in and at what voltage is it conducting?

Back 14

Forward bias, conducting at 5 volts

Front 15

Electron flow theorises that current flows from which electrode to which electrode?

Back 15

Cathode to Anode

Front 16

Holes diffusing from P to N means what for the depletion layer?

Back 16

It widens

Front 17

A thyristor can be switched off by

Back 17

Removing Vsupply

Front 18

What type of pulse is required to switch on an SCR?

Back 18

Positive

Front 19

Current flow in forward bias is due to what carrier?

Back 19

Majority

Front 20

What are the minority carriers for a forward biased PN junction device?

Back 20

Electrons and holes

Front 21

To convert AC to DC what component is most commonly used?

Back 21

A diode

Front 22

An intrinsic material means the material is

Back 22

Pure

Front 23

The voltage drop of a germanium diode is

Back 23

0.3V

Front 24

In an AC circuit, a diode is placed in parallel to protect it from

Back 24

The alternating current

Front 25

In reverse bias, current is carried by (Hint: forward is both)

Back 25

Minority

Front 26

An SCR switches off when the _____ goes negative to the ______

Back 26

Anode goes negative to cathode

Front 27

What is the average gain of an op amp?

Back 27

200,000

Front 28

Capacitance of a varactor diode is

Back 28

Inversely proportional to the reverse bias voltage

Front 29

A Schottky diode is used for

Back 29

VHF applications

Front 30

The junction barrier offers opposition to only

Back 30

Majority carriers

Front 31

Avalanche breakdown occurs when

Back 31

Reverse bias exceedes a specific value

Front 32

If forward bias is increased from 0 on a PN junction, a rapid increase in current flow for a relatively small voltage occurs only after the forward bias exceeds the

Back 32

Potential barrier

Front 33

A band pass filter excludes

Back 33

Frequency above and below a set range

Front 34

With a small amplitude, what type of diode would you use to produce the output waveform?

Back 34

Schottky

Front 35

A two directional zener diode stops power spikes in

Back 35

A coil

Front 36

What type of diode has holes and electrons recombine to produce photons?

Back 36

LED

Front 37

What diode operates above it's breakdown voltage

Back 37

A zener

Front 38

A triac is a type of

Back 38

Thyristor

Front 39

If a reversed bias diode is biased to far, load current will

Back 39

Increase

Front 40

An LED which emits green light uses

Back 40

Gallium phosphide

Front 41

LED that emits red uses

Back 41

Gallium arsenide phosphide

Front 42

Photodiodes operate under

Back 42

Reverse bias conditions

Front 43

To increase capacitance of a varactor diode decrease the-

Back 43

Reverse bias

Front 44

A thyristor can be forward biased by what type of pulse?

Back 44

Positive

Front 45

N type materials that are doped have excess electrons known as

Back 45

Donors

Front 46

If the anode is clamped to ground, it is known as a

Back 46

Positive clamping circuit

Front 47

If a diode has gone open circuit in a full wave bridge rectifier, the output frequency ripple is the same as

Back 47

Input frequency

Front 48

The output frequency of rectified DC from a full wave rectifier is

Back 48

0Hz

Front 49

After passing through a rectifier AC becomes

Back 49

DC lumpy,pulsating or half wave

Front 50

A zener diode only works when in

Back 50

Reverse bias

Front 51

Acceptors, unlike donors, are associated with

Back 51

P type material