LMRT Core
Exam Test Bank
2025 (Latest
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,LMRT Core Exam
1. What does the practice of ALARA require from a
professional radiographer?
Answer: The practice of ALARA requires the radiographer to
restrict the XR beam to the clinical area of interest.
2. What are the factors that affect XR emission under the
direct control of the radiographer called?
Answer: The factors are called prime factors.
3. What does milliamperage-second (mAs) directly affect,
except for which factor?
Answer: mAs directly affects mA & filtration, but it does not affect
beam quality.
4. What are the factors that directly affect XR quantity?
Answer: The factors that directly affect XR quantity are mA &
beam filtration.
5. What are the factors that directly affect XR quality?
Answer: The factors that directly affect XR quality are kVp & beam
filtration.
,6. If 1 coulomb is equal to 6.3 x 10^18 electron charges, how
many electrons flow from cathode to anode in 1 second?
Answer: 6.3 x 10^18 electrons flow from cathode to anode in 1
second.
7. If 1 ampere equals a flow of 6.3 x 10^18 electrons per
second, how many electrons flow from cathode to anode in 1
milliampere?
Answer: 6.3 x 10^15 electrons flow from cathode to anode in 1
milliampere.
8. What happens as the mA doubles?
Answer: The number of electrons flowing from cathode to anode
increases 2-fold.
9. What is the product of tube current and exposure time
equal to?
Answer: The product of tube current and exposure time is equal to
XR beam quantity.
10. What should the radiographer do to increase
radiographic film density by 40%?
Answer: The radiographer should change the mAs from 15 mAs to
21 mAs.
11. What is the relationship between mAs and exposure?
Answer: The relationship between mAs and exposure is directly
proportional.
12. What is the law that relates the reaction of a
photographic film to light and the product of light intensity
, and exposure duration?
Answer: The reciprocity law describes this relationship.
13. What happens when the kVp is increased for an
exposure?
Answer: Increasing the kVp will cause the electrons to travel faster
from cathode to anode.
14. What does increasing the energy of an incident electron
result in?
Answer: Increasing the energy of an incident electron results in
the production of an XR photon with greater energy.
15. What is the primary controlling factor of radiographic
film density?
Answer: Kilovoltage (kVp) is the primary controlling factor of
radiographic film density.
16. What should be adjusted to control radiographic
contrast?
Answer: Adjustments in kVp should be used to control
radiographic contrast.
17. What primarily controls XR beam penetrability?
Answer: kVp primarily controls XR beam penetrability.
18. Which set of exposure conditions would yield an image
with the greatest radiographic film density, all other factors
remaining constant?
Answer: The set of exposure conditions 400 mA, 200 ms, 40" SID
would yield the greatest radiographic film density.
Exam Test Bank
2025 (Latest
Update) New
Questions and
Answers Verified
Review
,LMRT Core Exam
1. What does the practice of ALARA require from a
professional radiographer?
Answer: The practice of ALARA requires the radiographer to
restrict the XR beam to the clinical area of interest.
2. What are the factors that affect XR emission under the
direct control of the radiographer called?
Answer: The factors are called prime factors.
3. What does milliamperage-second (mAs) directly affect,
except for which factor?
Answer: mAs directly affects mA & filtration, but it does not affect
beam quality.
4. What are the factors that directly affect XR quantity?
Answer: The factors that directly affect XR quantity are mA &
beam filtration.
5. What are the factors that directly affect XR quality?
Answer: The factors that directly affect XR quality are kVp & beam
filtration.
,6. If 1 coulomb is equal to 6.3 x 10^18 electron charges, how
many electrons flow from cathode to anode in 1 second?
Answer: 6.3 x 10^18 electrons flow from cathode to anode in 1
second.
7. If 1 ampere equals a flow of 6.3 x 10^18 electrons per
second, how many electrons flow from cathode to anode in 1
milliampere?
Answer: 6.3 x 10^15 electrons flow from cathode to anode in 1
milliampere.
8. What happens as the mA doubles?
Answer: The number of electrons flowing from cathode to anode
increases 2-fold.
9. What is the product of tube current and exposure time
equal to?
Answer: The product of tube current and exposure time is equal to
XR beam quantity.
10. What should the radiographer do to increase
radiographic film density by 40%?
Answer: The radiographer should change the mAs from 15 mAs to
21 mAs.
11. What is the relationship between mAs and exposure?
Answer: The relationship between mAs and exposure is directly
proportional.
12. What is the law that relates the reaction of a
photographic film to light and the product of light intensity
, and exposure duration?
Answer: The reciprocity law describes this relationship.
13. What happens when the kVp is increased for an
exposure?
Answer: Increasing the kVp will cause the electrons to travel faster
from cathode to anode.
14. What does increasing the energy of an incident electron
result in?
Answer: Increasing the energy of an incident electron results in
the production of an XR photon with greater energy.
15. What is the primary controlling factor of radiographic
film density?
Answer: Kilovoltage (kVp) is the primary controlling factor of
radiographic film density.
16. What should be adjusted to control radiographic
contrast?
Answer: Adjustments in kVp should be used to control
radiographic contrast.
17. What primarily controls XR beam penetrability?
Answer: kVp primarily controls XR beam penetrability.
18. Which set of exposure conditions would yield an image
with the greatest radiographic film density, all other factors
remaining constant?
Answer: The set of exposure conditions 400 mA, 200 ms, 40" SID
would yield the greatest radiographic film density.
