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Electronics > Defenitions > Flashcards

Defenitions Flashcards

1
Q

Rectification is the process of converting DC voltage into AC voltage

True or false

A

False

Rectification is the process of converting AC voltage to DC voltage

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2
Q

The voltage drop of a centre tap full wave rectifier is

.7
1.4
2
1.5

A

.7

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3
Q

The voltage drop of a bridge rectifier is
.7
1.4
1.5
2

A

1.4

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4
Q

When a semiconductor made from silicone is heated, it’s resistance

A

Decreases

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5
Q

P type semiconductors are doped with elements that have

A

Two valence electrons

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6
Q

N type semiconductors are doped with elements that have

A

Five valence electrons

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7
Q

In N type semiconductor, the majority of current is conducted by

A

Electrons

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8
Q

In P type semiconductor, the majority of current is conducted by?

A

Holes

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9
Q

The outermost orbit of electrons is called the?

A

Valance shell

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10
Q

Atoms with nearly empty valence shells make good?

A

Conductors

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11
Q

Atoms with half full valance shells make good?

A

Semiconductors

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12
Q

Atoms with full valance shells are good?

A

Insulator

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13
Q

The atoms of a material used as a conductor generally contain how many valence electrons

A

1 or 2

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14
Q

The atoms of a material used as an insulator generally contain how many valence electrons?

A

7-8

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15
Q

The two most common materials used to produce semiconductor devices are what?

A

Silicone and germanium

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16
Q

What is a lattice structure?

A

A lot of structure is an ordered arrangement of atoms in the atomic structure of a material

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17
Q

How is a P type material made?

A

Add a material which has only three valence electrons to appear semiconductor material

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18
Q

How is an N type material made?

A

Add a material which has five valence electrons to a pure semiconductor material

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19
Q

Which type of semiconductor material can withstand the greatest amount of heat?

A

Silicone

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20
Q

All electronic components are formed from P & N type materials. What factors determine what kind of components will be formed.

A

The thickness and manner in which the P and N type materials are joined together, determine the components

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21
Q

Name 4 types of fixed resistors

A

Composition carbon
Metal film
Carbon film
Wirewound

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22
Q

What is the advantage of a metal film resistor over a carbon resistor?

A

Metal film resistors do not change their ohmic value with age

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23
Q

What is the advantage of a wire wound resistor?

A

Wire wound resistors have a higher power rating

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24
Q

Is 51,000 ohms a standard value for a 5% resistor?

A

Yes

25
Q

What is a potentiometer?

A

A variable resistor used to control voltage

26
Q

What electrical quantity such as voltage, current, resistance, or watt is the oscilloscope used to measure?

A

Voltage

27
Q

What quantity is measured on the X axis of an oscilloscope?

A

Time

28
Q

What quantity is measured on the Y axis of an an oscilloscope?

A

Amplitude of voltage

29
Q

What is the beam Finder used for?

A

To show the position of the trace, if it’s off the display

30
Q

Why should a bright spot not be left on display of an oscilloscope?

A

It will burn a spot on the face of the CRT

31
Q

What is the function of the slope control?

A

It permits the oscilloscope to trigger on the positive or negative half of the wave form

32
Q

What type of metre measures the voltage drop across a resistor to determine its resistance value

A

Digital ohmmeter

33
Q

What function does a heat sink serve when it is attached to a component?

A

The heat sink increases the surface area of the component, which permits air to remove heat at a faster rate

34
Q

Why should thermal compound be used when attaching a component to a heat sink?

A

It produces a good thermal bond between two components

35
Q

How many elements of a semiconductor material are contained in a diode?

A

Two

36
Q

If a dial is made of silicone, how many volts does it take to turn it on so that it will conduct current in forward direction?

A

.6 to .7

37
Q

Must the voltage connected to an anode of a diode be positive or negative to make it forward biased?

A

Positive

38
Q

What does the PIV rating on diode mean?

A

The amount of voltage it can hold off in reverse direction

39
Q

How many layers of semiconductor material are diodes constructed with?

A

2

40
Q

True or false
A junction dialled is designed to conduct current from the cathode terminal to the anode terminal ?

A

False
A Junction diet is designed to conduct current from the anode terminal to the cathode terminal

41
Q

Forward voltage drop of silicon diode at room temperature is approximately what voltage?

A

.7

42
Q

When the anode is positive with respect to the cathode, a diode is what biased?

A

Forward

43
Q

When the cathode is positive with respect to the anode, a diode is what biased

A

Reverse

44
Q

The maximum voltage a diode can block in the reverse direction is known as what

A

Peak inverse voltage (PIV)

45
Q

The small amount of current flow through a diode in reverse buys is called?

A

Leakage current

46
Q

The forward voltage drop of a single LED is in the range of 1.6 V to 4.2 V

True or false

A

True

47
Q

When powered from a fixed voltage source, an LED requires a resistor in series true or false

A

True

48
Q

What do the letters LED stand for?

A

Light emitting diode

49
Q

If an LED is connected to an AC circuit, will the output voltage be AC or DC

A

DC

50
Q

What is the average Ford voltage drop of an LED?

A

1.7 V

51
Q

Is the resistance of a CAD cell greater in darkness or in light?

A

In darkness

52
Q

What is a rectifier?

A

Device that changes AC voltage into DC voltage

53
Q

What is the simplest type of rectifier?

A

Halfway rectifier

54
Q

What type of single phase rectifier requires the use of a centre tapped transformer?

A

Full wave rectifier with two diodes

55
Q

What type of single phase rectifier requires the use of four diodes?

A

A bridge rectifier

56
Q

What is the most efficient type of single phase rectifier?

A

Full wave rectifier, 2 diodes

57
Q

What type of three phase rectifier requires the use of a WYE-connected transformer with a centre tap?

A

Half wave

58
Q

How many diets are required to construct a three phase, full wave rectifier?

A

6

59
Q

Which type of rectifier has less ripple? A full wave, single phase rectifier or a half wave three phase rectifier?

A

Half wave three phase rectifier

Electronics (1 decks)

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