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LMRT Assessment Tests QUESTIONS
AND ANSWERS. NEW UPDATE!!
. What type of current is required for proper operation of the x-ray tube? -
CORRECT ANSWER -Direct
Electromagnetic radiation travels: - CORRECT ANSWER -In waves along a
straight path
Frequency is defined as: - CORRECT ANSWER -The number of waves passing
a point per unit time
Wavelength is defined as the distance from: - CORRECT ANSWER -Peak to
peak of the wave
Wavelength and frequency are: - CORRECT ANSWER -Inversely proportional to
each other The x-ray beam changes as it travels through the patient by a process called: -
CORRECT 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: - CORRECT
ANSWER -inverse square law
Electricity is supplied to the imaging department by a: - CORRECT ANSWER -
Generator
High-frequency power: - CORRECT ANSWER -Has almost no ripple
The primary advantage of three-phase power is that: - CORRECT ANSWER -
Voltage never drops to zero A variable transformer that is used to select kVp for the x-ray circuit is the: -
CORRECT ANSWER -Autotransformer
A transformer that has more turns in the secondary coil than in the primary coil is called
a: - CORRECT ANSWER -Step-up transformer
What is the transformer used to boost voltage to kilovoltage levels called? -
CORRECT ANSWER -Step-up transformer
Voltage coming to the x-ray machine is kept constant through the use of a(n): -
CORRECT ANSWER -Line voltage compensator
A step-down transformer: - CORRECT ANSWER -Steps down voltage
Where does thermionic emission occur? - CORRECT ANSWER -Cathode
. Which of the following devices is prereading? - CORRECT ANSWER -kVp
meter Which device reduces voltage and provides current to produce an electron cloud or
space charge at the filament? - CORRECT ANSWER -Step-down transformer
What changes AC to DC? - CORRECT ANSWER -Rectifier
Which of the following is surrounded by a negatively charged focusing cup? -
CORRECT ANSWER -Filament
Which of the following is composed of solid-state silicon-based diodes? - CORRECT
ANSWER -rectifier
What regulates the duration of x-ray production? - CORRECT ANSWER -Timer
What is located in the x-ray circuit between the high-voltage transformer and the x-ray
tube? - CORRECT ANSWER -Rectifier
Which of the following measures tube current? - CORRECT ANSWER -mA
meter
What device spins at 10,000-12,000 rpm? - CORRECT ANSWER -Anode
What device uses maximum heat storage ability of the tube to deliver mAs? -
CORRECT ANSWER -Falling load generator
Three-phase, 6-pulse full-wave rectification produces: - CORRECT ANSWER -
Direct current with 13% ripple
Three-phase, 12-pulse full-wave rectification produces: - CORRECT ANSWER -
Direct current with 4% ripple
The collimator must be accurate to a level of: - CORRECT ANSWER -±2% of
SID
kVp must be accurate to within: - CORRECT ANSWER -10% of the control panel
setting
Exposure linearity must be accurate to within: - CORRECT ANSWER -10%
Exposure reproducibility must be accurate to within: - CORRECT ANSWER -5%
The test that measures the accuracy of successive exposures is: - CORRECT
ANSWER -Exposure reproducibility
Exposure reproducibility - CORRECT ANSWER -5% of the time chosen for
exposures over 10 ms
Which of the following has the least voltage ripple? - CORRECT ANSWER -high
frequency In CR radiography, the photo-stimulable phosphor holds the latent image. -
CORRECT ANSWER -true
The minimum half value layer at 70 kVp should be ________ - CORRECT
ANSWER -2.5 mm Al
What is the term used to describe restriction of patient movement to ensure safety? -
CORRECT ANSWER -Restraint
All the following statements regarding hand hygiene and skin care are correct except -
CORRECT ANSWER -any cracks or abrasions should be left uncovered to
facilitate healing. Which of the following should be used as interpreter for patients having language
barriers? - CORRECT ANSWER -A trained interpreter
If a radiographer continues a lumbar spine examination after the patient states that he or she does not want to finish the examination, that radiographer can be found guilty of -
CORRECT ANSWER -battery
While in your care for a radiologic procedure, a patient asks to see his chart. Which of
the following is the appropriate response? - CORRECT ANSWER -Inform the
patient that he has the right to see his chart but that he should request to view it with his physician so that it is interpreted properly. Which of the following conditions must be met in order for patient consent to be valid? -
CORRECT ANSWER -The patient must sign the consent form before receiving
sedation. The physician named on the consent form must perform the procedure. All the blanks on the consent form must be filled in before the patient signs the form. How should the wheelchair footrests be positioned as a patient is assisted into or out of
a wheelchair? - CORRECT ANSWER -Moved aside
You and a fellow radiographer have received an unconscious patient from a motor vehicle accident. As you perform the examination, it is important that you -
CORRECT ANSWER -refer to the patient by name.
make only those statements that you would make with a conscious patient. reassure the patient about what you are doing. When a patient arrives in the radiology department with a urinary Foley catheter bag, it
is important to - CORRECT ANSWER -place the drainage bag below the level of
the bladder. When a patient with one strong side and one weak side is being assisted onto an x-ray
table, the radiographer should - CORRECT ANSWER -position the stronger side
closer to the table. Handwashing is the easiest way of preventing spread of microorganisms, and health care professionals should wash their hands before and after every patient. Additionally, it is particularly essential that the radiographer wash his/her hands after contact with -
CORRECT ANSWER -blood/body fluids.
patients with known communicable diseases. Which of the following visual signs can the radiographer use to continually assess
patient condition? - CORRECT ANSWER -I. Changes in skin color
II. Changes in skin temperature III. Level of consciousness (LOC) IV. Breathing rate
What is the normal respiratory rate for adults? - CORRECT ANSWER -12 to 18
breaths per minute Tuberculosis, varicella, and rubeola are examples of infections transmitted via
transmission. - CORRECT ANSWER -airborne
The easiest and most effective method of controlling the transmission of infections is
probably what? - CORRECT ANSWER -Handwashing
Needlestick injuries are avoided in which of the following ways? - CORRECT
ANSWER -Avoiding needle recapping
Eye contact, facial expression, personal appearance, touch, etc are all examples of
what type of communication. - CORRECT ANSWER -Nonverbal
What is the destruction of pathogens through the use of chemical materials termed? -
CORRECT ANSWER -Disinfection
Vital signs include which of the following? - CORRECT ANSWER -I. Body
temperature II. Pulse rate III. Respiratory rate IV. Arterial blood pressure Disposable materials wet with contaminated blood or body fluids should be placed
where? - CORRECT ANSWER -n a special container marked with biohazard
symbol
What is the difference between assault and battery? - CORRECT ANSWER -
Assault is the threat to touch another in an injurious way; battery is unlawful touching of another without consent Reservoir of is the term used to describe the principal habitat where a particular infectious agent lives and multiplies, and from which it can spread to cause disease. -
CORRECT ANSWER -infection
Which is the term used to describe the ethical principle of truthfulness? - CORRECT
ANSWER -Veracity
An inanimate object that has been in contact with an infectious microorganism is termed
a - CORRECT ANSWER -fomite.
What type of transmission-based precaution is required for influenza, mumps, and
rubella? - CORRECT ANSWER -Droplet
Which is the ethical term used to describe no evil, that is, our obligation not to inflict
harm? - CORRECT ANSWER -Nonmaleficence
When performing cardiopulmonary resuscitation (CPR) on an infant, it is recommended that the number of compressions per minute, compared with that for an adult,
decrease. - CORRECT ANSWER -remain the same.
Which of the following guidelines should be followed when performing radiographic
examinations on pediatric patients? - CORRECT ANSWER -Use restraint only
when necessary
Vehicles of infection include which of the following? - CORRECT ANSWER -I.
Contaminated water II. Food III. Blood IV. Drugs What is the normal adult systolic range and normal adult diastolic range? -
CORRECT ANSWER -100 to 140; 60 to 90
Urinary collection bags should be kept where, relative to the level of the urinary
bladder? - CORRECT ANSWER -Below
What is the difference between the Code of Ethics and the Rules of Ethics in the ARRT
Standards of Ethics? - CORRECT ANSWER -The Code of Ethics is aspirational;
the Rules of Ethics is enforceable. Which of the following latex allergy reactions would be considered mild, as opposed to
severe? - CORRECT ANSWER -Skin redness, Hives, Itching
In the circumstance that a patient is required to give informed consent for a procedure that involves risk or is experimental, which of the following truly defines informed
consent? - CORRECT ANSWER -A patient must receive full explanation of the
procedure, risks, and benefits before being anesthetized. The intrathecal route of drug administration falls into which category of administration? -
CORRECT ANSWER -Parenteral
What is a 35-year-old radiation worker's lifetime cumulative effective dose limit? -
CORRECT ANSWER -350 mSv
Which of the following are not types of beam restrictors? - CORRECT
ANSWER -All are types of beam restrictors
Which of the major interactions between x-ray photons and tissue cells is a major
contributor to patient dose? - CORRECT ANSWER -Compton scatter
Biologic material irradiated under hypoxic conditions is: - CORRECT ANSWER -
less sensitive than when irradiated under oxygenated conditions The annual effective dose (EfD) limit for radiography students participating in clinical
education before the age of 18 is: - CORRECT ANSWER -1 mSv
The following are types of protective apparel for personnel. - CORRECT
ANSWER -Lead aprons
Lead gloves Thyroid shields True or false, the energy of an x-ray beam be described as polyenergetic, or having a
spectrum of energies? - CORRECT ANSWER -True
The genetic dose of radiation borne by each member of the reproductive population is
called the - CORRECT ANSWER -genetically significant dose
Because the primary x-ray beam is polyenergetic, the entrance dose is often: -
CORRECT ANSWER -significantly greater than the exit dose.
The type of acute radiation syndrome that requires the least amount of ionizing radiation
dose to occur is: - CORRECT ANSWER -Hematological
Where/how should a fetal personal radiation monitor be worn? - CORRECT
ANSWER -Under the lead apron, at waist level
Which of the following illustrates the inverse square law? - CORRECT
ANSWER -Distance is a most effective protection from radiation.
Which is not a type of patient shield? - CORRECT ANSWER -Flat shadow
shields
The two basic types of protective barriers are - CORRECT ANSWER -primary
barriers and secondary barriers. Which of the following results in total absorption of an incident x-ray photon? -
CORRECT ANSWER -Photoelectric interaction
What agency publishes radiation protection standards based on scientific research? -
CORRECT ANSWER -National Council on Radiation Protection and
Measurements (NCRP)
ALARA is an acronym for: - CORRECT ANSWER -A radiation protection concept
that encourages radiation users to keep the dose to the patient as low as reasonably achievable Which of the following is the basis for all radiation protection standards? -
CORRECT ANSWER -Linear-nonthreshold effect
Which of the following means there is a safe level of radiation for certain effects and those effects are directly proportional to the dose received when the safe level is
exceeded? - CORRECT ANSWER -Linear-threshold effect
According to NCRP Report #116, what is the embryo or fetus equivalent dose limit per
month? - CORRECT ANSWER -0.5 mSv
According to NCRP Report #116, the annual occupational effective dose limit is: -
CORRECT ANSWER -50 mSv
According to NCRP Report #116, what is the annual effective dose limit for the general
public, assuming infrequent exposure? - CORRECT ANSWER -5 mSv
According to NCRP Report #116, what is the annual effective occupational dose limit for
the lens of the eye? - CORRECT ANSWER -150 mSv
Cells are least radio-sensitive in what phase of mitosis/meiosis: - CORRECT
ANSWER -Synthesis Phase
Which of the following occurs when radiation transfers its energy straight to DNA? -
CORRECT ANSWER -Direct effect
What occurs when radiation transfers its energy to the cellular cytoplasm? -
CORRECT ANSWER -Indirect effect
Which of the cardinal principles of radiation protection is used to decrease personnel
exposure? - CORRECT ANSWER -Increase distance from the source of
radiation Place shielding between the source and yourself Decrease the amount of time exposed
What unit of measurement is used for effective dose limits? - CORRECT
ANSWER -Gyt
Cell radiosensitivity is described by the: - CORRECT ANSWER -Law of Bergonié
and Tribondeau To ensure the lifetime risk of occupationally exposed persons remains within acceptable limits, each person cannot exceed a lifetime dose. The lifetime dose is termed the
______ dose. - CORRECT ANSWER -cumulative effective
The greatest cause of unnecessary radiation to patients is from: - CORRECT
ANSWER -repeat exposures.
