RAD 121 - CHAPTER 4 & 5 TEST REVIEW QUESTIONS
WITH VERIFIED ANSWERS
A filament may break due to
a. evaporation
b. deposition
c. vaporization
d. ablation - Answers - C. vaporization
Pitting of the anode commonly occurs
a. when the anode is off-focus
b. when the kilo-voltage is too high
c. when the unit is not warmed up properly
d. with extended use - Answers - d. with extended use
All of the following would lengthen x-ray tube life EXCEPT:
a. use low mA selections whenever clinically possible
b. avoid sudden movements of the tube head assembly
c. minimize anode rotation times and prepping
d. use high-speed anode rotation on distal extremity studies - Answers - d. use high-
speed anode rotation on distal extremity studies
The function of the stator and rotor assembly is to
a. insulate the anode
b. rotate the anode
c. change the anode angle
d. disrupt the electromagnets of the induction motor - Answers - b. rotate the anode
The magnetic flux through a wire loop
a. stays fixed in orientation regardless of electron flow
b. is max whenever the plane of the loop is perpendicular to the magnetic field
c. requires a time varying magnetic field
d. increases as the magnetic field decreases - Answers - b. is max when the plane of
the loop is perpendicular to the magnetic field
A stator consist of
a. commutator rings
b. a rotor
, c. bars of copper around an iron core
d. electromagnetics - Answers - d. electromagnetics
The function of the cathode is to produce
a. a focal point
b. a thermionic cloud
c. an electrical connection to the rectifier
d. a grounding effect - Answers - b. a thermionic cloud
Tungsten is the material of choice form the source of x-ray photons primarily because of
its
a. low melting point
b. low mass number
c. high atomic number
d. g-force tolerance - Answers - c. high atomic number
The exact point on the anode where the x-ray beam emanates is the
a. rotor
b. focusing cup
c. stator
d. focal spot - Answers - d. focal spot
As the angle of the anode increases and incident electron beam size remains the same,
the effective focal spot size
a. decreases
b. remains the same
c. increases
d. can not be determined - Answers - c. increases
The protective housing controls scatter radiation and leakage through
a. evaporation
b. condensation
c. vaporization
d. absorption - Answers - d. absorption
The use of the line focus principe causes a problem known as the _____ effect.
a. space charge
b. anode heel
c. quantum mottle
d. saturation current - Answers - b. anode heel
WITH VERIFIED ANSWERS
A filament may break due to
a. evaporation
b. deposition
c. vaporization
d. ablation - Answers - C. vaporization
Pitting of the anode commonly occurs
a. when the anode is off-focus
b. when the kilo-voltage is too high
c. when the unit is not warmed up properly
d. with extended use - Answers - d. with extended use
All of the following would lengthen x-ray tube life EXCEPT:
a. use low mA selections whenever clinically possible
b. avoid sudden movements of the tube head assembly
c. minimize anode rotation times and prepping
d. use high-speed anode rotation on distal extremity studies - Answers - d. use high-
speed anode rotation on distal extremity studies
The function of the stator and rotor assembly is to
a. insulate the anode
b. rotate the anode
c. change the anode angle
d. disrupt the electromagnets of the induction motor - Answers - b. rotate the anode
The magnetic flux through a wire loop
a. stays fixed in orientation regardless of electron flow
b. is max whenever the plane of the loop is perpendicular to the magnetic field
c. requires a time varying magnetic field
d. increases as the magnetic field decreases - Answers - b. is max when the plane of
the loop is perpendicular to the magnetic field
A stator consist of
a. commutator rings
b. a rotor
, c. bars of copper around an iron core
d. electromagnetics - Answers - d. electromagnetics
The function of the cathode is to produce
a. a focal point
b. a thermionic cloud
c. an electrical connection to the rectifier
d. a grounding effect - Answers - b. a thermionic cloud
Tungsten is the material of choice form the source of x-ray photons primarily because of
its
a. low melting point
b. low mass number
c. high atomic number
d. g-force tolerance - Answers - c. high atomic number
The exact point on the anode where the x-ray beam emanates is the
a. rotor
b. focusing cup
c. stator
d. focal spot - Answers - d. focal spot
As the angle of the anode increases and incident electron beam size remains the same,
the effective focal spot size
a. decreases
b. remains the same
c. increases
d. can not be determined - Answers - c. increases
The protective housing controls scatter radiation and leakage through
a. evaporation
b. condensation
c. vaporization
d. absorption - Answers - d. absorption
The use of the line focus principe causes a problem known as the _____ effect.
a. space charge
b. anode heel
c. quantum mottle
d. saturation current - Answers - b. anode heel
