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Imaging Equipment and Management (2)
100問 • 5ヶ月前
  • polyyamyap
    • 通報

    問題一覧

  • 1

    1 Wb =

    10^18 lines of flux

  • 2

    the unit/s for magnetic flux density

    Tesla/Gauss

  • 3

    1T =

    10,000 G

  • 4

    1 T =

    1 Wb/m^2

  • 5

    the electrons of an electron spin rotates ____ and ____

    axial clockwise; counterclockwise

  • 6

    closed loops

    lines of magnetic field

  • 7

    proton of a hydrogen nucleus spin on its axis and creates a nuclear magnetic dipole

    magnetic moment

  • 8

    created when an accumulation of many atomic magnets with their dipoles aligned

    magnetic domain

  • 9

    ability of a material to attract the lines of magnetic field intensity

    magnetic permeability

  • 10

    earth and lodestone are an example of

    naturally occuring magnet

  • 11

    bar or horseshoe-shaped magnet that can be destroyed through heating or hitting

    artificially-induced permanent magnet

  • 12

    wire wrapped on iron core

    electromagnets

  • 13

    ease of material can be magnetized

    permeability

  • 14

    ability to stay magnetized

    retentivity

  • 15

    permeability and retentivity are ___

    inversely proportional

  • 16

    unaffected by magnetic field

    wood/glass

  • 17

    weakly repeller from both poles of magnetic field

    water/plastic

  • 18

    weakly attracted

    gadolinium

  • 19

    strongly magnetized and can be made into a magnet by induction

    iron/nickle/cobalt

  • 20

    wood and glass are an example of

    nonmagnetic

  • 21

    water and plastic are an example of

    diamagnetic

  • 22

    gadolinium is an example of

    paramagnetic

  • 23

    iron, nickle, and cobalt are an example of

    ferromagnetic

  • 24

    most useful to produce ferro

    alnico

  • 25

    a stronger magnet developed recently

    rare earth ceramic

  • 26

    material can be magnetic through induction

    magnetic induction

  • 27

    imaginary magnetic field line

    magnetic lines of induction

  • 28

    magnetic and electric field behave similarly

    Maxwell's field theory

  • 29

    diatance between two bar is halved and magnetic force is increased 4x

    Maxwell's field theory

  • 30

    the magnetic field in equator is

    50 microT

  • 31

    the magnetic field in earth's poles is

    100 microT

  • 32

    a stacked Cu-Zn is used to form a cell of battery that is used to increase current

    voltaic pile

  • 33

    precursor of modern battery

    voltaic pile

  • 34

    he described the first law of EM induction

    Michael Faraday

  • 35

    he used an ammeter to measure current

    Michael Faraday

  • 36

    he used a compass to measure current

    Hans Oersted

  • 37

    According to Michael Faraday, magnetic field induce ____ and magnetic field generate ___

    current; electricity

  • 38

    current in neigbouring circuit

    mutual induction

  • 39

    a current within conductive coil opposing

    self induction

  • 40

    it is done with diodes and replaced by solid state rectifier made of silicon

    voltage recitification

  • 41

    a semiconductor with loosely bound electrons

    N-type

  • 42

    a semiconductor that have spaces (holes) and has no electron flow

    P-type

  • 43

    current exists in positive half only

    unrectified voltage

  • 44

    voltage is not allowed to swing negatively

    half-wave rectification

  • 45

    has 1 to 2 diodes

    half-wave rectification

  • 46

    Which among the follwong are the disadvantage of half-wave rectification: 1. has gaps in waveform 2. waste half of the power supply 3. has no gaps in waveform 4. uses twice the exposure timer

    1, 2, and 4

  • 47

    the negative half of the cycle is reversed the mode is always positive

    full-wave rectification

  • 48

    has 4 diodes

    full-wav rectification

  • 49

    results in pulsating xray beam caused by alternating swing in voltage from 0 to maximum potential 120 x 1 sec under full wave rectification

    single-phase power

  • 50

    xrays produced has a value near 0

    single-phase power

  • 51

    tests the efficacy of single-phase power

    spinning top test

  • 52

    generates three simultaneous voltage waveform

    three-phase electric power

  • 53

    multiple voltage waveform are superimposed on one waveform

    three-phase electric power

  • 54

    maintains constant high voltage never dropping tonzero during exposure

    three-phase electric power

  • 55

    the following are the disadvantages of a three-phase electeic power except: 1. size 2. cost 3. initiation time 4. extinction time

    none of the above

  • 56

    configuration of a transformer windings in three-phase segment

    star/wye

  • 57

    HVT has ___ primary (delta winding) and ___ secondary (star/wye)

    3;3

  • 58

    other name of oscilloscope

    synchronous spinning top test

  • 59

    tests the efficacy of three-phase electric power

    oscilloscope

  • 60

    what is the appearance in oscilloscope?

    solid arc

  • 61

    nearly constant potential voltage waveform

    high frequency generator

  • 62

    improved image quality at low radiation dose that has 500 to 25,000 pulse/sec

    high frequency generator

  • 63

    a generator whose advantage is in size

    high frequency generator

  • 64

    a generator first used with portable xray

    high frequency generator

  • 65

    a generator that uses inverter type circuit

    high frequency generator

  • 66

    high speed switcher that converts DC into a series of sequence pulses

    high frequency generator

  • 67

    what is the voltage ripple of single phase generator?

    100%

  • 68

    voltage ripple of half wave

    100%

  • 69

    voltage ripple of three phase, six pulse

    14%

  • 70

    voltage ripple of three phase, twelve pulse

    4%

  • 71

    voltage ripple of high frequency generator

    <1%

  • 72

    voltage xray supply of three phase, twelve pulse

    96%

  • 73

    contained in protective housing

    xray tube

  • 74

    special diode of xray tube

    cathode and anode

  • 75

    two components of cathode

    filament and focusing cup

  • 76

    what is the length of a filament?

    1-2 cm

  • 77

    what is the diameter of a filament?

    2 mm

  • 78

    how many percentage of thorium is needed in a filament?

    1-2%

  • 79

    what is the material of a filament?

    tungsten

  • 80

    which of the following are the advantages of using a thorium in a filament? 1. enhances thermionis emission 2. prolongs tube life 3. acts as an insulator 4. cooling of the tube

    1 and 2

  • 81

    what is a focusing cup?

    metal shroud

  • 82

    material of a focusing cup

    nickel

  • 83

    confines electron beam to small area of anode

    focusing cup

  • 84

    types of anode

    stationary and rotating

  • 85

    capable of producing high intensity in short time

    rotating anode

  • 86

    if high tube current and power is not required

    stationary anode

  • 87

    which among the following are the external components of an xray tube? 1. support structure 2. protective housing 3. glass or metal enclosure

    1, 2, and 3

  • 88

    most frequently used support system

    ceiling support system

  • 89

    single control, tube float

    ceiling support system

  • 90

    this is where xray interacts

    input phospor

  • 91

    this is where energy is connected to visible light

    input phosphor

  • 92

    electron emission that follows light stimulation

    photoemission

  • 93

    made of Cesium and Antinomy

    photocathode

  • 94

    an active element of image intensifier tube

    Cs and Sb

  • 95

    emits electron when illuminated

    photocathode

  • 96

    another name for focusing lens

    electrostatic lens

  • 97

    focuses electrons toward anode

    electrostatic lens

  • 98

    a donut shaped that has hole in middle that accelerates electron toward output phosphor

    accelerating anode

  • 99

    made of zinc cadmium sulfide

    output phosphor

  • 100

    sends signal to charge coupled device

    output phosphor

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    問題一覧

  • 1

    1 Wb =

    10^18 lines of flux

  • 2

    the unit/s for magnetic flux density

    Tesla/Gauss

  • 3

    1T =

    10,000 G

  • 4

    1 T =

    1 Wb/m^2

  • 5

    the electrons of an electron spin rotates ____ and ____

    axial clockwise; counterclockwise

  • 6

    closed loops

    lines of magnetic field

  • 7

    proton of a hydrogen nucleus spin on its axis and creates a nuclear magnetic dipole

    magnetic moment

  • 8

    created when an accumulation of many atomic magnets with their dipoles aligned

    magnetic domain

  • 9

    ability of a material to attract the lines of magnetic field intensity

    magnetic permeability

  • 10

    earth and lodestone are an example of

    naturally occuring magnet

  • 11

    bar or horseshoe-shaped magnet that can be destroyed through heating or hitting

    artificially-induced permanent magnet

  • 12

    wire wrapped on iron core

    electromagnets

  • 13

    ease of material can be magnetized

    permeability

  • 14

    ability to stay magnetized

    retentivity

  • 15

    permeability and retentivity are ___

    inversely proportional

  • 16

    unaffected by magnetic field

    wood/glass

  • 17

    weakly repeller from both poles of magnetic field

    water/plastic

  • 18

    weakly attracted

    gadolinium

  • 19

    strongly magnetized and can be made into a magnet by induction

    iron/nickle/cobalt

  • 20

    wood and glass are an example of

    nonmagnetic

  • 21

    water and plastic are an example of

    diamagnetic

  • 22

    gadolinium is an example of

    paramagnetic

  • 23

    iron, nickle, and cobalt are an example of

    ferromagnetic

  • 24

    most useful to produce ferro

    alnico

  • 25

    a stronger magnet developed recently

    rare earth ceramic

  • 26

    material can be magnetic through induction

    magnetic induction

  • 27

    imaginary magnetic field line

    magnetic lines of induction

  • 28

    magnetic and electric field behave similarly

    Maxwell's field theory

  • 29

    diatance between two bar is halved and magnetic force is increased 4x

    Maxwell's field theory

  • 30

    the magnetic field in equator is

    50 microT

  • 31

    the magnetic field in earth's poles is

    100 microT

  • 32

    a stacked Cu-Zn is used to form a cell of battery that is used to increase current

    voltaic pile

  • 33

    precursor of modern battery

    voltaic pile

  • 34

    he described the first law of EM induction

    Michael Faraday

  • 35

    he used an ammeter to measure current

    Michael Faraday

  • 36

    he used a compass to measure current

    Hans Oersted

  • 37

    According to Michael Faraday, magnetic field induce ____ and magnetic field generate ___

    current; electricity

  • 38

    current in neigbouring circuit

    mutual induction

  • 39

    a current within conductive coil opposing

    self induction

  • 40

    it is done with diodes and replaced by solid state rectifier made of silicon

    voltage recitification

  • 41

    a semiconductor with loosely bound electrons

    N-type

  • 42

    a semiconductor that have spaces (holes) and has no electron flow

    P-type

  • 43

    current exists in positive half only

    unrectified voltage

  • 44

    voltage is not allowed to swing negatively

    half-wave rectification

  • 45

    has 1 to 2 diodes

    half-wave rectification

  • 46

    Which among the follwong are the disadvantage of half-wave rectification: 1. has gaps in waveform 2. waste half of the power supply 3. has no gaps in waveform 4. uses twice the exposure timer

    1, 2, and 4

  • 47

    the negative half of the cycle is reversed the mode is always positive

    full-wave rectification

  • 48

    has 4 diodes

    full-wav rectification

  • 49

    results in pulsating xray beam caused by alternating swing in voltage from 0 to maximum potential 120 x 1 sec under full wave rectification

    single-phase power

  • 50

    xrays produced has a value near 0

    single-phase power

  • 51

    tests the efficacy of single-phase power

    spinning top test

  • 52

    generates three simultaneous voltage waveform

    three-phase electric power

  • 53

    multiple voltage waveform are superimposed on one waveform

    three-phase electric power

  • 54

    maintains constant high voltage never dropping tonzero during exposure

    three-phase electric power

  • 55

    the following are the disadvantages of a three-phase electeic power except: 1. size 2. cost 3. initiation time 4. extinction time

    none of the above

  • 56

    configuration of a transformer windings in three-phase segment

    star/wye

  • 57

    HVT has ___ primary (delta winding) and ___ secondary (star/wye)

    3;3

  • 58

    other name of oscilloscope

    synchronous spinning top test

  • 59

    tests the efficacy of three-phase electric power

    oscilloscope

  • 60

    what is the appearance in oscilloscope?

    solid arc

  • 61

    nearly constant potential voltage waveform

    high frequency generator

  • 62

    improved image quality at low radiation dose that has 500 to 25,000 pulse/sec

    high frequency generator

  • 63

    a generator whose advantage is in size

    high frequency generator

  • 64

    a generator first used with portable xray

    high frequency generator

  • 65

    a generator that uses inverter type circuit

    high frequency generator

  • 66

    high speed switcher that converts DC into a series of sequence pulses

    high frequency generator

  • 67

    what is the voltage ripple of single phase generator?

    100%

  • 68

    voltage ripple of half wave

    100%

  • 69

    voltage ripple of three phase, six pulse

    14%

  • 70

    voltage ripple of three phase, twelve pulse

    4%

  • 71

    voltage ripple of high frequency generator

    <1%

  • 72

    voltage xray supply of three phase, twelve pulse

    96%

  • 73

    contained in protective housing

    xray tube

  • 74

    special diode of xray tube

    cathode and anode

  • 75

    two components of cathode

    filament and focusing cup

  • 76

    what is the length of a filament?

    1-2 cm

  • 77

    what is the diameter of a filament?

    2 mm

  • 78

    how many percentage of thorium is needed in a filament?

    1-2%

  • 79

    what is the material of a filament?

    tungsten

  • 80

    which of the following are the advantages of using a thorium in a filament? 1. enhances thermionis emission 2. prolongs tube life 3. acts as an insulator 4. cooling of the tube

    1 and 2

  • 81

    what is a focusing cup?

    metal shroud

  • 82

    material of a focusing cup

    nickel

  • 83

    confines electron beam to small area of anode

    focusing cup

  • 84

    types of anode

    stationary and rotating

  • 85

    capable of producing high intensity in short time

    rotating anode

  • 86

    if high tube current and power is not required

    stationary anode

  • 87

    which among the following are the external components of an xray tube? 1. support structure 2. protective housing 3. glass or metal enclosure

    1, 2, and 3

  • 88

    most frequently used support system

    ceiling support system

  • 89

    single control, tube float

    ceiling support system

  • 90

    this is where xray interacts

    input phospor

  • 91

    this is where energy is connected to visible light

    input phosphor

  • 92

    electron emission that follows light stimulation

    photoemission

  • 93

    made of Cesium and Antinomy

    photocathode

  • 94

    an active element of image intensifier tube

    Cs and Sb

  • 95

    emits electron when illuminated

    photocathode

  • 96

    another name for focusing lens

    electrostatic lens

  • 97

    focuses electrons toward anode

    electrostatic lens

  • 98

    a donut shaped that has hole in middle that accelerates electron toward output phosphor

    accelerating anode

  • 99

    made of zinc cadmium sulfide

    output phosphor

  • 100

    sends signal to charge coupled device

    output phosphor