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M3 > Geoff M3 Questions > Flashcards

Geoff M3 Questions Flashcards

1
Q

Name the particles that make up an atom

A

Protons, Neutrons, electrons

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2
Q

What is the charge of a proton

A

Positive

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3
Q

What is the charge of a neutron

A

Neutral

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4
Q

What is the charge of a electron

A

Negative

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5
Q

What is the value of a charge in a proton

A

0.1602x10^-18

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6
Q

What is the value of an electron

A

-0.1602x10^-18

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7
Q

What is a charged atom called

A

Ion

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8
Q

What is a molecule

A

A neutral group of 2 or more atoms

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9
Q

How are atoms bonded together in a molecule

A

Chemically

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10
Q

What charge is held by a cation

A

Positive

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11
Q

What charge is held by an anion

A

Negative

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12
Q

What is a compound

A

Composes of atoms from more then one element

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13
Q

What is the outer shell of an atom called

A

Valence shell

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14
Q

How many atoms would be found in the outer shell for a conductor

A

Less then 4

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15
Q

How many electrons would be found in the outer shell of a insulator

A

4 or more

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16
Q

How many electrons would be found in the outer shell for a semi-conductor

A

Exactly 4

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17
Q

Adding a foreign atom to a molecule is called what

A

Doping

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18
Q

Give 2 examples of insulators

A

Mica, porcelain

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19
Q

How can static electricity be produced

A

Contact, friction or induction

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20
Q

A glass rod rubbed with fur will hold what sort of charge

A

Negative

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21
Q

A glass rod rubbed with silk will hold what charge

A

Positive

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22
Q

Electrons that move from one material to another are called what

A

Free electrons

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23
Q

When brought close together what will like charges do to each other

A

Repel

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24
Q

When brought close together what will unlike charges do

A

Attract

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25
Q

What is the SI unit of charge

A

Coulomb

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26
Q

How do we calculate current density

A

Current density=current/cross sectional area

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27
Q

What is the maximum temp a wire can be heated to

A

60*c

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28
Q

When we state a cables capacity what value is ambient temperature

A

25*c

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29
Q

If DC is applied to water what gas is generated at the positive pole

A

Oxygen

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30
Q

If DC is applied to water what gas is produced at the negative p9le

31
Q

Decomposition of chemical compounds by passing an electric current through a liquid is called what

A

Electrolysis

32
Q

In a battery what is the conducting liquid called

A

Electrolyte

33
Q

What equipment provides a visualisation of rapidly varying process in electrical engineering

A

Oscilloscope

34
Q

What equipment provide a visualisation of rapidly varying process in electrical engineering and record it

A

Oscillograph

35
Q

What is the name given to the means of producing a picture using an electron beam

A

Braun tube CRT

36
Q

What is the unit for potential difference

37
Q

What does EMF stand for

A

Electromotive Force

38
Q

What is EMF

A

Electrical charges will exert a push or pull force on each other without coming into contact with one another

39
Q

What is the unit for voltage

40
Q

What are the 2 kinds of electrical voltage

41
Q

Describe DC voltage

A

A voltage has the same polarity over time even if the values changes

42
Q

Describe AC voltage

A

If size and polarity of the voltage changes

43
Q

If we want to measure voltage how should we connect the voltmeter

A

In parallel with the circuit

44
Q

What is electric current

A

The flow of electrical charges in a curtain direction

45
Q

What is the equation to calculate current

46
Q

What is the unit for current

47
Q

For a current of 1 amp to flow how many electrons need to pass a point in 1 second

A

6.24x10^18

48
Q

To measure current how should we connect our meter

49
Q

What is the unit for resistance

50
Q

Draw ohms law triangle

51
Q

What is the unit for conductance

52
Q

What do we use to generate electricity from light

A

Photocells

53
Q

The potential energy stored in an electron is measured in what unit

A

Electron volts

54
Q

If we use heat to generate electricity what is it called

A

Thermionic

55
Q

If we use pressure to generate electricity what is it called

A

Piezo electric effect

56
Q

List a few examples that uses pressure to generate electricity

A

Crystal microphone, Crystal loudspeaker, lighters, gas lighters, pressure gauges and dynamometers

57
Q

Describe the basic requirements of a battery

A

2 different metals suspended in an electrolyte

58
Q

What action is it called for what happens in a battery cell

A

Galvanic action

59
Q

What term is used to describe electric generation by moving a conductor in a magnetic field

60
Q

What will determine the amount of voltage generated through induction

A

Magnetic field strength,
length of wire
Speed of motion

61
Q

What do we call a one use only battery cell

A

Primary cell

62
Q

What do we call a rechargeable cell

A

Secondary cell

63
Q

What is the unit of battery cell capacity

A

Ampere hours

64
Q

What are the most common metals used for thermocouples

A

Chromel and alumel

65
Q

Where do we use thermocouples

A

Measuring exhaust gas temps

66
Q

What voltage can a photocell produce

67
Q

Describe a sinusodial waveform

A

Equal alternation positive half reflects negative half

68
Q

What do we call a waveform that is not equal positive and negative

A

Superimposed

69
Q

What is a period

A

Time taken to achieve 1 complete cycle

70
Q

How do we calculate peak value from RMS

71
Q

How do we calculate RMS from peak value

A

Peak x 0.707

72
Q

What voltage can be achieved from a 3phase generator

A

115v phase to neutral and 200v from phase to phase

73
Q

How far apart are the phases in a generator

A

120 degrees

M3 (2 decks)

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