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Rad Spring Final > Physics Unit 3 > Flashcards

Physics Unit 3 Flashcards

1
Q

What term is used to describe how easily materials can be magnetized?

A

Permeability

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2
Q

A material that cannot be magnetized because the electrons all spin in different directions is called a_____ material

A

Non-magnetic

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3
Q

When using the left hand thumb rule for straight conductors, the fingers encircling the wire indicate

A

Direction of magnetic field

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4
Q

Materials that are weakly repelled by magnets area classified as what type of magnet

A

Diamagnetic

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5
Q

The term “electromagnetic induction: refers to the production of

A

An electric current

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6
Q

Ferromagnetic

A

Iron, cobalt, and nickel

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7
Q

Nonmagnetic

A

Wood, plastic, and glass

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8
Q

Diamagnetic

A

Beryllium, bismuth, and lead

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9
Q

Paramagnetic

A

Gadolinium, platinum, and aluminum

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10
Q

The north pole of a magnet will be attracted to the north pole of another magnet

A

False

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11
Q

T/F no matter how many pieces a magnet is cut into, each piece will have a north and south pole

A

True

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12
Q

T/F the more closely spaced, the lines of magnetic flux, the weaker the field

A

False

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13
Q

Which person discovered electromagnetic induction

A

Faraday

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14
Q

Which of the following types of magnets are considered temporary

A

Electromagnets

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15
Q

The more coils or numbers of turns a conductor has, the _____ the electromagnetic force

A

Greater

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16
Q

The unit of measurement of magnetic flux is the

A

Weber

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17
Q

Lines of force, on the external surface of a magnet, move from the___pole to the _____pole

A

North, south

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18
Q

A coiled helix, carrying an electrical current is known as a

A

Solenoid

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19
Q

What is the difference between an electromagnet and solenoid?

A

An electromagnetic has a ferromagnetic core, and a solenoid has no core

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20
Q

In a straight conductor, when the conventional current is flowing out of a piece of paper, lying on the table, what direction will the magnetic field be traveling?

A

Counter clockwise

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21
Q

Which of the following statements is true regarding the strength of induced current

A

The faster the conductor, the stronger the current

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22
Q

What principle does the auto transformer work?

A

Electromagnetic self induction

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23
Q

What device varies the voltage that will go to the step up transformer

A

Auto transformer

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24
Q

What is the difference between a step up transformer in the auto transformer?

A

The auto transformer only has one coil

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25
Q

Where is the auto transformer located?

A

Between the incoming AC and the high voltage transformer

26
Q

There are two separate circuits, supplying the x-ray tube. Which one carries the amperage needed to heat the filament.

A

Filament circuit

27
Q

Of the two circuits, supplying the tube, which one applies the necessary potential difference across the tube that makes the electrons race from cathode to anode

A

Filament circuit

28
Q

And auto transformer with primary turns, and 1000 secondary turns, has a turns ratio of

A

1:2

29
Q

What device is used to increase the amperage to the filament?

A

Step down transformer

30
Q

What device is used to increase the voltage to kilovoltage ?

A

Step up transformer

31
Q

What is the terms ratio if a transformer has 40 primary turns and 80 secondary turns

A

2:1, 80:40

32
Q

A transformer with fewer turns on its secondary coil is a

A

Step down transformer

33
Q

An auto transformer;

A

Varies the voltage going to the high voltage transformer

34
Q

An auto transformer can be considered a

A

KV selector

35
Q

The most efficient type of transformer construction utilized in x-ray equipment is the

A

Shell type

36
Q

A dynamo is another name for a/an

A

Electric generator

37
Q

How do generators create energy?

A

Electromagnetic induction

38
Q

The stronger the magnetic lines are in an electrical generator the;

A

Stronger the induced current, & the closer the flex lines around the magnet

39
Q

Slip rings and brushes can be found in

A

An AC generator

40
Q

A generator converts

A

Mechanical to electrical energy

41
Q

T/F The voltage on the secondary side of a step down transformer is less than on the primary

A

True

42
Q

T/F the amperage on the secondary side of a step up transformer is greater than on the primary

A

False

43
Q

T/F the strength of the induced voltage in the secondary coil of a transformer is directly proportional to the number of turns it has in its coil

A

True

44
Q

T/F a step down transformer, has a turns ratio of greater than one

A

False

45
Q

T/F a transformer, if you increase voltage, you must increase amperage

A

False

46
Q

T/F transformers, can operate on AC and DC

A

False

47
Q

T/F current stays in a constant direction in an AC circuit

A

False

48
Q

What device in the x-ray machine uses an induction motor

A

Rotor

49
Q

The type of rectification, where no actual rectifier is added to the circuit is

A

Self rectification

50
Q

Half wave rectification is inefficient because

A

It uses only half the available energy of the AC

51
Q

Half wave rectification can be accomplished by using____ or___ diodes

A

One or two

52
Q

Full wave rectification uses a minimum of_____ solid state diodes to rectify the entire AC in usable energy

A

4

53
Q

A single phase, fully rectified unit has how much ripple

A

100%

54
Q

A three phase, 6-pulse fully rectified unit has how much ripple

A

13%

55
Q

How much ripple does a high frequency, fully rectified unit have

A

Less than 1%

56
Q

Full rectification uses____ of the available AC

A

All

57
Q

In three phase energy, the waveforms are out of step with each other by

A

1/3 of the cycle

58
Q

In order for a solid-state, semi conductor to conduct current, a _____ Change must be applied to the P side of the P-N Junction

A

Positive

59
Q

In a rectifier,_____ flows with the direction of the arrow

A

Current

60
Q

Which digit indicates the direction of the current flow

A

Middle

61
Q

1 A= _____mA

A

1000

62
Q

1 V= ______kV

A

.001

Rad Spring Final (9 decks)

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