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RADI Physics Final Review Flashcards | StudBud
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RADI Physics Final Review
RADI Physics Final Review
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1
All of the following is true about an autotransformer, EXCEPT:
adjusts the number of turns in the secondary coil
adjusts voltage
is also called a variable transformer
operates on the principle of self-induction
2
Which letter represents a wave trough?
C
A
NONE OF THESE
B
3
X-ray photons are emitted:
Ionically
None of these.
Isotonically
Isotropically
4
The addition or removal of a proton results in:
a positron
a different isotope
a different element
a different ion
5
Potential difference is another term for all of the following, EXCEPT:
voltage
electromotive force
current
electric potential
6
Which is true of the focusing cup?
it is positively charged
does not focus the electron stream
it is made of tungsten
it is negatively charged
7
Which of the following has a positive charge?
Neutron
Proton
Electron
Photon
8
To extend tube life, the technologist should:
Use the highest mA station to reduce time and avoid motion
Use lower mA stations when possible
Never warm up the tube
Always depress the rotor switch in two steps
9
The atomic number (Z#) of Tungsten is:
82
88
72
74
10
All of the following are properties of x-rays, EXCEPT:
are polyenergetic and heterogeneous.
travel in straight lines.
are electrically neutral and not affected by electrical or magnetic fields.
can be focused by a lens.
11
The binding energy of a K-shell electron of a Tungsten atom is:
74 keV
12 keV
69.5 keV
70 keV
12
When were x-rays discovered?
October 8, 1895
November 5, 1898
November 6, 1895
November 8, 1895
13
The octet rule states:
atoms are most stable in groups of 8.
atoms are most stable with 8 neutrons in their valence shell.
atoms are most stable with 8 electrons in their valence shell.
atoms are most stable with 8 protons in their valance shell.
14
Leakage radiation must not exceed:
1 mR/hr at 10 m
100 mR/hr at 1 m
100 mR/hr at 10 m
1 mR/hr at 1 m
15
Resistance has a significant impact on a _____ circuit.
series
parallel
16
When one force field acts on another (without physical contact), this is referred to as:
induction
friction
static discharge
electromagnetism
17
Ghosting is caused by:
Leakage Radiation
Scatter Radiation
Primary Radiation
Off-Focus Radiation
18
What is the voltage ripple of a single phase generator?
None of these
100%
1%
14%
19
The minimum amount of time necessary for AEC to recognize and terminate an exposure is:
Back Up Timer
Delayed Response Time
5 Minute Timer
Minimum Response Time
20
Which of the following is controlled by AEC?
kVp
FSS
mA
mAs
21
An atom that has gained or lost a neutron is a(n):
neutrino
isotope
ion
ionization
22
Which of the following is the unit of measurement of current?
Ohm Ω
Ampere (amp)
Joule (J)
Volt (potential difference)
23
An insulator has a large difference between the conduction and valance bands and resists electric flow.
True
False
24
Of the following generators, which is most efficient?
High Frequency
Three phase, six pulse
Three phase, 12 pulse
Single phase, two pulse
25
When the area of interest is smaller than the activated AEC chamber, the resulting image will be:
properly exposed
undiagnostic
under exposed
over exposed
26
Bremsstrahlung Interactions occur between:
an incident electron and the force field of the nucleus
an incident photon and an inner shell electron
an incident electron and an outer shell electron
an incident photon and the force field of the nucleus
27
How much of the target interactions within the anode produce x-ray photons?
>1%
25%
99.8%
0.2%
28
Voltage remains the same across all resistances in a ______ circuit.
parallel
series
29
Which number represents the step-up transformer?
1
5
8
3
30
How is power calculated?
P = I V
P = I R
P = I / R
P = I R
31
Direct current (DC) occurs when all e- flow in the same direction and then reverse & move in the opposite direction.
False
True
32
As distance from the nucleus increases, electron binding energy ____.
stays the same
decreases
increases
33
According to particle theory, photon energy and frequency are ____ proportional.
indirectly
directly
34
The exposure switch must be a "dead man" type.
False
True
35
The maximum number of electrons that can be contained in the N shell is:
32
18
9
8
36
The US typically uses __ Hz alternating current, which reverse their polarity ___ times per second.
50; 100
60; 200-240
50; 120
60; 120
37
Filtration ___ the intensity of the beam, and ___ the average photon energy of the beam.
increases, decreases
increases, increases
decreases, decreases
decreases, increases
38
The process of boiling off electrons from a filament is known as:
gyroscopic effect
thermionic emission
space charge effect
saturation current
39
According to the anode heel effect, radiation intensity is greater on the ___ side.
cathode
anode
40
Photons not produced at the focal spot are called:
Secondary Radiation
Primary Radiation
Leakage Radiation
Extrafocal Radiation
41
As effective focal spot increases, recorded detail ____.
is not effected
increases
decreases
42
X-ray generators typically use what type of transformer?
Closed Core
Shell Type
Open Core
Air Core
43
Heat is also known as:
kinetic energy
thermal energy
electric potential
friction
44
According to wave theory, frequency and wavelength are ___ proportional.
indirectly
not
directly
45
The quantity of matter contained in an object is:
matter
mAs
weight
mass
46
Pairs of stationary magnets (or electromagnets) arranged around a rotating core is called a(n):
rotor
stator
galvanometer
rectifier
47
Electrons have an atomic mass number of:
2
-1
1
0
48
When there is a significant amount of overlap between the conduction and valence bands, the material is considered a(n):
insulator
conductor
semi-conductor
49
AEC Backup timers must be set to:
500 mAs
5 minutes
150% of the expected manual mAs
2,000 mAs
50
Intensity of a wave is also known as:
energy
wavelength
amplitude
period
51
What is the speed of light in a vacuum?
9.05 x 10-28 m/s
4.15 x 10-15 eV-s
3 x 108 m/s
343 m/s
52
Which material(s) make up the back and neck of the anode?
Molybdneum and Graphite
Rhenium and Graphite
Tungsten and Rhenium
Tungsten and Molybdneum
53
Which of the following is not located within the glass envelope?
Rotor
Cathode
Stator
Bearings
54
Step-up transformer has 100 turns in P coil; 1,000 turns in the S coil; input volt of 120 v, what is the output voltage?
12, 000 V
0.12 kV
12 kV
1.2 kV
55
According to Ohm's Law, current and resistance are _____ related.
directly
not
inversely
56
What is the most common material used for the construction of the x-ray table?
Carbon Graphite Fiber
Plexiglass
Aluminium
Lead
57
A bond formed by attraction of oppositely charged ions in a chemical compound:
ion
ionic bond
valance bond
covalent bond
58
In which direction does conventional electric current flow?
positive to positive
negative to negative
positive to negative
negative to positive
59
Which of the following are necessary to produce x-rays?
source of e- and appropriate target material (cathode and anode)
all of these
vacuum
high voltage
60
The energy of motion is known as:
kinetic energy
chemical energy
friction energy
potential energy
61
Density Controls should be used with AEC to adjust for part thickness.
True
False
62
Which of the following represents the wave formula?
E=mc2
E=hυ
V=IR
c=υλ
63
Which number represents the rheostat?
6
7
4
2
64
Which letter represents a three phase, twelve pulse generator?
A
C
D
B
65
Which number represents the exposure switch?
7
2
3
1
66
When more than one AEC chamber is activated:
none of these is true
only chambers under the area of interest contribute to the signal
AEC back-up time is increased
the signal of all active chambers is averaged
67
Which of the following is not a function of the anode?
conducts high voltage from the cathode back into the generator circuitry
serves as a primary thermal conductor
serves as a target surface for high-voltage e- from the filament
serves as a target surface for high energy photons from the filament
68
All of the following are true about variable resistors, except:
are also called rheostats
are also called auto-transformers
changes the amount of current, if voltage stays the same
are part of the filament circuit
69
Step-down transformer has 1,000 turns in P coil; 100 turns in the S coil; input volt of 120 v, whats the output voltage?
12, 000 V
1.2 V
12 V
0.12 V
70
As anode (target) angle increases, effective focal spot ______.
increases
decreases
is not affected
71
Self induction involves:
two coils wrapped around two cores
a single coil wrapped around a single core
a single coil wrapped around two cores
two coils wrapped around a single core
72
What is the melting point of Tungsten?
1,500 °C
2,620 °C
3,370 °C
2,200 °C
73
Tungsten the primary metal of choice for the focal track of the anode for all of the reasons, EXCEPT:
Heat-conducting ability
High melting point
High atomic number
Light weight
74
Which is the high-voltage circuit?
Filament Circuit
Secondary Side, Main Circuit
Primary side, main circuit
Rotor Circuit
75
All of the following affect the strength of a solenoid, EXCEPT:
number of loops
strength of the current
the length
the number of turns on the secondary coil
76
A Step-Up Transformer has __ (more, fewer) turns in secondary coil and __ (higher, lower) voltage on the secondary side.
fewer, higher
more, lower
more, higher
fewer, lower
77
Which of the following is not one of the five fundemental laws of electrostatics?
distribution
ionization
repulsion-attraction
inverse square law
78
A temporary magnet produced by moving electric current is a(n):
natural magnet
electromagnet
conductor
artifical permanent magnetic
