LMRT Assessment Tests Correct 100%
. What type of current is required for proper operation of the x-ray tube? - ANSWER
Direct
Electromagnetic radiation travels: - ANSWER In waves along a straight path
Frequency is defined as: - ANSWER The number of waves passing a point per unit time
Wavelength is defined as the distance from: - ANSWER Peak to peak of the wave
Wavelength and frequency are: - ANSWER Inversely proportional to each other
The x-ray beam changes as it travels through the patient by a process called: -
ANSWER Attenuation
The intensity of radiation is inversely proportional to the square of the distance between
the source of radiation and the person receiving it. This describes the: - ANSWER
inverse square law
Electricity is supplied to the imaging department by a: - ANSWER Generator
High-frequency power: - ANSWER Has almost no ripple
The primary advantage of three-phase power is that: - ANSWER Voltage never drops to
zero
A variable transformer that is used to select kVp for the x-ray circuit is the: - ANSWER
Autotransformer
A transformer that has more turns in the secondary coil than in the primary coil is called
a: - ANSWER Step-up transformer
What is the transformer used to boost voltage to kilovoltage levels called? - ANSWER
Step-up transformer
Voltage coming to the x-ray machine is kept constant through the use of a(n): -
ANSWER Line voltage compensator
A step-down transformer: - ANSWER Steps down voltage
Where does thermionic emission occur? - ANSWER Cathode
. Which of the following devices is prereading? - ANSWER kVp meter
, Which device reduces voltage and provides current to produce an electron cloud or
space charge at the filament? - ANSWER Step-down transformer
What changes AC to DC? - ANSWER Rectifier
Which of the following is surrounded by a negatively charged focusing cup? - ANSWER
Filament
Which of the following is composed of solid-state silicon-based diodes? - ANSWER
rectifier
What regulates the duration of x-ray production? - ANSWER Timer
What is located in the x-ray circuit between the high-voltage transformer and the x-ray
tube? - ANSWER Rectifier
Which of the following measures tube current? - ANSWER mA meter
What device spins at 10,000-12,000 rpm? - ANSWER Anode
What device uses maximum heat storage ability of the tube to deliver mAs? - ANSWER
Falling load generator
What is the source of bremsstrahlung and characteristic rays? - ANSWER anode
What device is turned by a rotor? - ANSWER anode
The process of thermionic emission causes: - ANSWER Electrons to boil off the filament
The force with which the electron stream passes from cathode to anode is a result of
_____ passing through the x-ray tube. - ANSWER Kilovoltage
Most of the energy conversion in the x-ray tube produces: - ANSWER Heat
X-rays are produced as incident electrons are slowed going past the nuclei of target
atoms by a process called: - ANSWER Bremsstrahlung
. X-rays are produced as incident electrons collide with inner shell electrons in target
atoms by a process called: - ANSWER Characteristic
What percentage of energy in the x-ray tube is converted to x-rays? - ANSWER 1%
The x-ray beam is: - ANSWER Heterogeneous or polyenergetic—consisting of many
different energies (wavelengths)
. What type of current is required for proper operation of the x-ray tube? - ANSWER
Direct
Electromagnetic radiation travels: - ANSWER In waves along a straight path
Frequency is defined as: - ANSWER The number of waves passing a point per unit time
Wavelength is defined as the distance from: - ANSWER Peak to peak of the wave
Wavelength and frequency are: - ANSWER Inversely proportional to each other
The x-ray beam changes as it travels through the patient by a process called: -
ANSWER Attenuation
The intensity of radiation is inversely proportional to the square of the distance between
the source of radiation and the person receiving it. This describes the: - ANSWER
inverse square law
Electricity is supplied to the imaging department by a: - ANSWER Generator
High-frequency power: - ANSWER Has almost no ripple
The primary advantage of three-phase power is that: - ANSWER Voltage never drops to
zero
A variable transformer that is used to select kVp for the x-ray circuit is the: - ANSWER
Autotransformer
A transformer that has more turns in the secondary coil than in the primary coil is called
a: - ANSWER Step-up transformer
What is the transformer used to boost voltage to kilovoltage levels called? - ANSWER
Step-up transformer
Voltage coming to the x-ray machine is kept constant through the use of a(n): -
ANSWER Line voltage compensator
A step-down transformer: - ANSWER Steps down voltage
Where does thermionic emission occur? - ANSWER Cathode
. Which of the following devices is prereading? - ANSWER kVp meter
, Which device reduces voltage and provides current to produce an electron cloud or
space charge at the filament? - ANSWER Step-down transformer
What changes AC to DC? - ANSWER Rectifier
Which of the following is surrounded by a negatively charged focusing cup? - ANSWER
Filament
Which of the following is composed of solid-state silicon-based diodes? - ANSWER
rectifier
What regulates the duration of x-ray production? - ANSWER Timer
What is located in the x-ray circuit between the high-voltage transformer and the x-ray
tube? - ANSWER Rectifier
Which of the following measures tube current? - ANSWER mA meter
What device spins at 10,000-12,000 rpm? - ANSWER Anode
What device uses maximum heat storage ability of the tube to deliver mAs? - ANSWER
Falling load generator
What is the source of bremsstrahlung and characteristic rays? - ANSWER anode
What device is turned by a rotor? - ANSWER anode
The process of thermionic emission causes: - ANSWER Electrons to boil off the filament
The force with which the electron stream passes from cathode to anode is a result of
_____ passing through the x-ray tube. - ANSWER Kilovoltage
Most of the energy conversion in the x-ray tube produces: - ANSWER Heat
X-rays are produced as incident electrons are slowed going past the nuclei of target
atoms by a process called: - ANSWER Bremsstrahlung
. X-rays are produced as incident electrons collide with inner shell electrons in target
atoms by a process called: - ANSWER Characteristic
What percentage of energy in the x-ray tube is converted to x-rays? - ANSWER 1%
The x-ray beam is: - ANSWER Heterogeneous or polyenergetic—consisting of many
different energies (wavelengths)
