RADT 102 – FINAL EXAM QUESTIONS
AND ANSWERS
What is the unit of mass? - Answer- kg
The sum of protons and neutrons in a Nucleus are called the - Answer- Mass
number
The number of protons determine the ____ of an element - Answer- Atomic #
In the excitation process, electrons in an atom are moved to a/an _____ energy
state - Answer- Higher
The maximum number of electrons found in any energy level (shell) at any point in
time is calculated by the formula - Answer- 2n2
Formula for the principle quantum # - Answer- 2n2
When two atoms of the same element have different numbers of neutrons, they are
called - Answer- Isotopes
Isotopes have ____ mass numbers and ______ atomic numbers - Answer-
Different; the same
An atom has an atomic number of 18 and a mass number of 38. Letting P = the
number of protons and N = the number of neutrons, which of the following atoms is
the isotope of this atom? - Answer- P = 18, N = 21
Carbon has an atomic number of 6. One of its isotopes has a mass number of 14.
The number of neutrons in this isotope is - Answer- 8
If an electron is gained or lost from an atom, that atom becomes - Answer- An Ion
According to the octet rule, - Answer- The valence shell is chemically inert
All of the following are forms of energy EXCEPT: - Answer- sound
When comparing Iodine (Z=53) and Barium (Z=56), - Answer- Iodine has 5
orbitals with electrons
As the electron shells move farther away from the Nucleus, total electron energy will
_____ and binding energy will ____ - Answer- Increase; decrease
, How many alterations in the direction of the current flow occur per second in a 60 Hz
AC current? - Answer- 120 (just positive or negative)
How many cycles in the direction of the current flow occur per second in a 60 Hz AC
current? - Answer- 60 (positive and negative)
The exposure switch is found between the - Answer- Autotransformer and the
Timer Circuit
The electrical device used to adjust the mA selection is the - Answer- Variable
resistor
The mA control is found between the - Answer- Incoming line and the Step-down
transformer
The kVp control is found between the - Answer- Incoming line and the Exposure
switch
The time control is found between the - Answer- Exposure switch and Step-up
transformer
The prime factors include all of the following EXCEPT: - Answer- Filtration
The prime factors are - Answer- mAs, time, kVp and distance
All of the following are radiographer-operated controls except for the - Answer-
Generator selection
The diagnostic x-ray range is approximately - Answer- -10 to 1,200 mA, 0.001 to
10 seconds and 25 to 150 kVp
The factors that affect x-ray emission under the direct control of the radiographer are
called the _____ factors - Answer- Prime
The exposure on an x-ray machine is intended to - Answer- Initiate the exposure
The key advantage of a curved-top radiographic table is the - Answer- Smaller
object to image distance (OID)
When using AEC at 80 kVp, back up times - Answer- Must not exceed 600 mAs
Back up time can NOT _____ and should be - Answer- Exceed the tube limit; Set
at 150% of expected manual mAs
AND ANSWERS
What is the unit of mass? - Answer- kg
The sum of protons and neutrons in a Nucleus are called the - Answer- Mass
number
The number of protons determine the ____ of an element - Answer- Atomic #
In the excitation process, electrons in an atom are moved to a/an _____ energy
state - Answer- Higher
The maximum number of electrons found in any energy level (shell) at any point in
time is calculated by the formula - Answer- 2n2
Formula for the principle quantum # - Answer- 2n2
When two atoms of the same element have different numbers of neutrons, they are
called - Answer- Isotopes
Isotopes have ____ mass numbers and ______ atomic numbers - Answer-
Different; the same
An atom has an atomic number of 18 and a mass number of 38. Letting P = the
number of protons and N = the number of neutrons, which of the following atoms is
the isotope of this atom? - Answer- P = 18, N = 21
Carbon has an atomic number of 6. One of its isotopes has a mass number of 14.
The number of neutrons in this isotope is - Answer- 8
If an electron is gained or lost from an atom, that atom becomes - Answer- An Ion
According to the octet rule, - Answer- The valence shell is chemically inert
All of the following are forms of energy EXCEPT: - Answer- sound
When comparing Iodine (Z=53) and Barium (Z=56), - Answer- Iodine has 5
orbitals with electrons
As the electron shells move farther away from the Nucleus, total electron energy will
_____ and binding energy will ____ - Answer- Increase; decrease
, How many alterations in the direction of the current flow occur per second in a 60 Hz
AC current? - Answer- 120 (just positive or negative)
How many cycles in the direction of the current flow occur per second in a 60 Hz AC
current? - Answer- 60 (positive and negative)
The exposure switch is found between the - Answer- Autotransformer and the
Timer Circuit
The electrical device used to adjust the mA selection is the - Answer- Variable
resistor
The mA control is found between the - Answer- Incoming line and the Step-down
transformer
The kVp control is found between the - Answer- Incoming line and the Exposure
switch
The time control is found between the - Answer- Exposure switch and Step-up
transformer
The prime factors include all of the following EXCEPT: - Answer- Filtration
The prime factors are - Answer- mAs, time, kVp and distance
All of the following are radiographer-operated controls except for the - Answer-
Generator selection
The diagnostic x-ray range is approximately - Answer- -10 to 1,200 mA, 0.001 to
10 seconds and 25 to 150 kVp
The factors that affect x-ray emission under the direct control of the radiographer are
called the _____ factors - Answer- Prime
The exposure on an x-ray machine is intended to - Answer- Initiate the exposure
The key advantage of a curved-top radiographic table is the - Answer- Smaller
object to image distance (OID)
When using AEC at 80 kVp, back up times - Answer- Must not exceed 600 mAs
Back up time can NOT _____ and should be - Answer- Exceed the tube limit; Set
at 150% of expected manual mAs
