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Physics > Final Mock 1 > Flashcards

Final Mock 1 Flashcards

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0
Q

The two basic types of induction are ___ induction and ____ induction.

A

Self; mutual

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1
Q

The magnitude of an induced current depends on the ________.

A

Angle of the conductor to the magnetic field

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2
Q

With half-wave rectification the current flows through the X-Ray tube during the ____ part of the cycle.

A

Positive

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3
Q

Len’z law states that an induced current flows in a direction that _____ the action that produces it.

A

Opposes

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4
Q

Like charges ___ and unlike charges ____.

A

Repel; attract

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5
Q

The lowest energy range of the electromagnetic spectrum is _____.

A

Radio waves

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6
Q

When a group of dipoles are aligned they create a _____.

A

Magnetic domain

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7
Q

The most widely used support structure for the X-Ray tube is the _____.

A

Ceiling support system

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8
Q

A single-phase waveform has ____ ripple.

A

100%

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9
Q

The mAs timer is usually set to give the ____ mA at the _____ time.

A

Highest; shortest

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10
Q

The step-up transformer increases voltage _____ times.

A

500-1000

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11
Q

A ____ is a source of direct current.

A

Battery

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12
Q

Variations in power distribution to the X-Ray machine are corrected by the _____.

A

Line voltage compensator

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13
Q

Photons tend to interact with matter _____ it’s wavelength.

A

Equal in size to

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14
Q

X-Rays are usually identified by their ____.

A

Energy

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15
Q

The magnetic intensity of an electromagnet is greatly increased by the addition of a(n) ___ core.

A

Iron

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16
Q

Photons with the highest frequencies have the _____.

A

Shortest wavelengths

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17
Q

A magnet created by a coil of wire is called an _____.

A

Electromagnet

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18
Q

The most accurate type of timer is the ____ timer.

A

Electronic

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19
Q

A _____ uses direct current.

A

Flashlight

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20
Q

The reduction of radiation intensity due to scattering and absorption is called ____.

A

Attenuation

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21
Q

The external structure for the X-Ray tube includes the support structure, the protective housing, and the ______.

A

Glass envelope

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22
Q

Most mammography units operate with ____ generators.

A

High frequency

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23
Q

The three main parts of the X-Ray imaging system are the X-Ray tube, ____, and _____.

A

Operating console; high voltage generator

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24
Q

On the surface of an electrical charge is the _____.

A

Photon

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25
Q

Full-wave rectified, three-phase units provide an X-Ray beam at ____ per second.

A

360 pulses

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26
Q

A commutator ring is used to change _____ current to _____ current in an electric generator.

A

Direct; alternating

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27
Q

A transformer has 100 coils on its primary side and 300 coils on the secondary side. What will the voltage be on the secondary side of the primary side is supplied with 120 volts?

A

360 volts

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28
Q

An electric potential applied to a conductor produces a(n) _____.

A

Electric current

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29
Q

What is the mechanical source of energy for electrical generators that supply electricity to our cities?

A

Waterfalls, steam from atomic power, and windmills

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30
Q

Voltage across the X-Ray tube is most constant with _____.

A

High frequency generators

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31
Q

Thermionic emission at the filament determines the _____ across the X-Ray tube during an exposure.

A

Milliamperage

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32
Q

The operating console contains circuits that are _____.

A

Low voltage only

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33
Q

Oersted discovered that an electric current flowing through a wire would affect a ______ nearby.

A

Compass

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34
Q

The rate of rise and fall of a sine wave is called it’s ______.

A

Frequency

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35
Q

The rotation of electrons on their axis is the property called _______.

A

Electron spin

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36
Q

The automatic exposure control (AEC) terminates the exposure when _________.

A

Sufficient radiation reaches the image receptor

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37
Q

The negative side of the X-Ray tube holds the ______.

A

Filament

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38
Q

The first batteries were made of stacks of _____ and _____ plates sandwiched together.

A

Zinc and copper

39
Q

Alternating current is produced by a _______.

A

Generator

40
Q

Wood, glass and plastic are _____ materials.

A

Non-magnetic

41
Q

What is the most common cause of tube failure?

A

Tungsten vaporization

42
Q

A device that converts any form of energy into electrical energy is a source of _________.

A

Magnetic strength

43
Q

What is the electromagnetic wave equation?

A

C=fv (lambda = half-life symbol)

44
Q

The X-Ray beam generated by the circuit with the _____ voltage ripple has the _____ quantity and quality.

A

Lowest; highest

45
Q

Of the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then it’s frequency must ______.

A

Decrease by half

46
Q

What is the industry standard formula for calculating heat units for single phase equipment?

A

mA x kVp x sec

47
Q

The _____ circuit provides electrons for the X-Ray tube current.

A

Filament

48
Q

A charged particle in motion created a(n) ______.

A

Magnetic field

49
Q

Electrostatic force is _____ proportional to the distance between charges and ____ proportional to the product of the charges.

A

Inversely; directly

50
Q

The modern imaging systems, the components for rectification are _______.

A

Solid state semiconductors

51
Q

The principle disadvantage of three-phase equipment is ______.

A

Cost

52
Q

A hertz (Hz) is equal to ______.

A

1 cycle per second

53
Q

Like magnetic poles ___ and unlike magnetic poles ____.

A

Repel; attract

54
Q

A diode allows electrons to flow ________.

A

From cathode to anode

55
Q

What is the SI unit of magnetic field strength?

A

Tesla

56
Q

The four properties of photons are….

A

Frequency, wavelength, velocity and amplitude.

57
Q

The intensity of radiation on an object is reduced with distance because the radiation ______.

A

Is spread out over a greater area

58
Q

Mechanical motion produces electric current in the _______

A

Electric generator

59
Q

Gamma rays are produced in the ____ of the atom.

A

Nucleus

60
Q

In the US alternating current goes through a complete cycle every _____ second.

A

1/60

61
Q

The smallest quantity of any type if electromagnetic radiation is a(n) ______.

A

Photon

62
Q

The charge on an electrified object are distributed _______.

A

On the side nearest the charge

63
Q

What is the Ohm’s Law?

A

I = V/R

64
Q

An alternating (AC) current is represented by a ______ line.

A

Sinusoidal

65
Q

A transformer converts _______.

A

Electrical potential to higher or lower intensity

66
Q

What is the velocity of all electromagnetic radiation?

A

3x10^8 m/s

67
Q

Electrification occurs through the movement of _____.

A

Only electrons

68
Q

Faraday’a experiments proved that a current could be introduced by a magnetic field only if the field is ______.

A

Changing

69
Q

The difference in the waveform between the primary and secondary side of the high voltage transformer is the _____.

A

Amplitude

70
Q

An electrical component that works through self-induction is the ______.

A

Transformer

71
Q

The number of windings on the primary side of a step-up transformer are always ____ than the number of windings on the secondary side.

A

Less

72
Q

What type of material can be made magnetic when placed in an external magnetic field?

A

Ferromagnetic

73
Q

A step-down transformer is located in the ____ circuit

A

Filament

74
Q

The X-Ray generator with the lowest power rating is the ____ system.

A

Single-phase imaging

75
Q

What is the unit of electric potential?

A

Volt

76
Q

An electric current can be induced in a coil of wire if it is placed near a(n) ______.

A

Electromagnet

77
Q

The _____ of electromagnetic radiation is constant.

A

Velocity

78
Q

If the intensity of light from a flashlight is 4 mililumens (mlm) at a distance of 3 feet, what will the intensity be at 6 feet?

A

1 mililumens

79
Q

As an X-Ray tube ages, the inside can become coated with tungsten, which can cause _______ in the tube.

A

Arcing

80
Q

A transformer has 600 coils on its primary side and 30 coils on its secondary side. What is the voltage on the secondary side when the primary side is 220 V?

A

11 V

81
Q

The high voltage generator contains the high voltage transformer, the ______.

A

Filament transformer and the rectifiers

82
Q

A coil of wire placed between two poles of a magnet with a strong magnetic field would be an ______.

A

Electric generator

83
Q

The intensity of radiation ______ proportion to the square if the distance of the object from the source.

A

Decreases in inverse

84
Q

Rubber and glass are ______.

A

Insulators

85
Q

The first component to receive power in the X-Ray circuit is the _______.

A

Auto transformer

86
Q

The energy of a photon is directly proportional to it’s ____.

A

Frequency

87
Q

The diagnostic range of X-Ray energy is ________.

A

30 to 150 kVp

88
Q

The mass equivalent of a 100 KeV photon of radiation can be calculated using the ________.

A

Planck quantum equation

89
Q

The current to a transformer must be supplied by a(n) _______.

A

AC source

90
Q

The force between magnetic poles is proportional to the _____ of the magnetic poles strength divided by the _____ of the distance between them.

A

Product; square

91
Q

Electrical power is measured in ______.

A

Watts

92
Q

The autotransformer has ______ winding.

A

One

93
Q

The most efficient type of transformer is the ________.

A

Shell-type transformer

94
Q

On the surface of an electrified object the charges concentrate ________.

A

On the sharpest curvatures

Physics (5 decks)

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