Deck 3: Basic Mathematics for Limited Operators

Question 1

A fraction in which the top number is larger than the bottom number is called a(n)_____ fraction.

A) proper
B) unnatural
C) improper
D) unconverted

Answer 1

improper

Question 2

If a satisfactory AP shoulder radiograph is made on a patient measuring 12 cm using 100 mA,0.15 sec,70 kVp,and 40 inches SID,which of the following techniques will provide the most similar radiograph of a patient whose shoulder measures 16 cm?

A) 100 mA, 0.20 sec, 70 kVp, 40 inches SID
B) 100 mA, 0.25 sec, 70 kVp, 40 inches SID
C) 100 mA, 0.25 sec, 78 kVp, 40 inches SID
D) 300 mA, 0.15 sec, 70 kVp, 40 inches SID

Answer 2

100 mA, 0.25 sec, 70 kVp, 40 inches SID

Question 3

Which of the following is equivalent to 0.25 seconds?

A) 250 milliseconds
B) 25 milliseconds
C) 2.5 milliseconds
D) 0.025 milliseconds

Answer 3

250 milliseconds

Question 4

In a continuing education course,you learn that approximately 85% of limited operators who have practiced for 5 or more years suffer from low-back pain. What does this number mean?

A) Of the total number of limited operators, 85 suffer from low-back pain.
B) Of every 100 limited operators, 85 suffer from low-back pain.
C) Every 5 years, 85 limited operators suffer from low-back pain.
D) Being a limited operator is very unhealthy.

Question 5

The lower or bottom number of a fraction is called a:

A) portion.
B) numerator.
C) fractionator.
D) denominator.

Question 6

What is the mAs when 400 mA is used with a 50-millisecond exposure time?

A) 20
B) 200
C) 2
D) 2000

Question 7

An x-ray exposure is made using the following factors: 300 mA,0.02 sec,60 kVp,60-inch SID,and the large focal spot. In this case,the value of the mAs is:

A) 0.06.
B) 0.6.
C) 6.
D) 60.

Question 8

What is a denominator?

A) The bottom or lower number of a fraction
B) The upper or top number of a fraction
C) The number divided into in a division problem
D) The answer to a division problem

Question 9

Which of the following is equivalent to 30 milliseconds?

A) of a second
B) 0.30 seconds
C) 0.03 seconds
D) of a second

Question 10

The upper or top number of a fraction is called a:

A) portion.
B) denominator.
C) fractionator.
D) numerator.

Question 11

A satisfactory AP lumbar spine radiograph is made using 200 mA,0.25 sec,78 kVp,and 40-inch SID. Which of the following technique changes will produce a radiograph of similar density while providing less contrast and less exposure to the patient?

A) 200 mA, 0.12 sec, 90 kVp, 40-inch SID
B) 200 mA, 0.20 sec, 78 kVp, 36-inch SID
C) 400 mA, 0.12 sec, 78 kVp, 40-inch SID
D) 100 mA, 0.25 sec, 78 kVp, 40-inch SID

Question 12

Which of the following is an exponential expression of 100,000 as a power of 10?

A) 103
B) 1002
C) 105
D) 106

Question 13

Which metric prefix is used to indicate 1000?

A) Deci
B) Kilo
C) Hector
D) Milli

Question 14

What is a numerator?

A) The answer to a multiplication problem
B) The answer to a division problem
C) The bottom or lower number of a fraction
D) The upper or top number of a fraction

Question 15

Which metric prefix is used to indicate 10?

A) Deci
B) Deka
C) Kilo
D) Centi

Question 16

What is required to add or subtract fractions?

A) Common numerator
B) Common quotient
C) Common dividend
D) Common denominator

Question 17

What is the decimal form oF second?

A) 0.1
B) 0.01
C) 0.001
D) 1.000

Question 18

What is the value of 2⁸?

A) 28
B) 16
C) 2576
D) 280

Question 19

A lateral thoracic spine on a 33-cm patient is usually taken using 200 mA (large focal spot),0.25 sec,86 kVp,40-inch SID,12:1 grid ratio. If the mA is increased to 400 to stop motion blur from tremors,which of the following technique changes will produce a radiographic density and contrast most similar to the original?

A) 0.13 sec, 86 kVp
B) 0.13 sec, 98 kVp
C) 0.65 sec, 76 kVp
D) 36-inch SID with no other change

Question 20

A satisfactory lateral lumbar spine radiograph is taken using 200 mA,0.6 sec,94 kVp,and 40 inches SID. If an increase in SID to 60 inches is desired,which of the following technique changes will produce a radiographic density most similar to the original?

A) 200 mA, 0.25 sec, 94 kVp
B) 200 mA, 1.33 sec, 94 kVp
C) 400 mA, 1.33 sec, 94 kVp
D) 200 mA, 1.33 sec, 108 kVp

Question 21

When the SID is doubled,the intensity of the radiation in the radiation field is:

A) doubled.
B) halved.
C) quadrupled.
D) reduced by a factor of 4.

Question 22

A satisfactory image is made using 200 mA and 0.05 sec. Which of the following exposures will produce a similar radiographic density?

A) 400 mA and 1/40 sec
B) 400 mA and 0.1 sec
C) 400 mA and 0.01 sec
D) 400 mA and 1/20 sec

Question 23

Which of the following exposures will create the greatest radiographic density?

A) 100 mAs at 40" SID
B) 200 mAs at 72" SID
C) 100 mAs at 36" SID
D) 200 mAs at 80" SID

Question 24

A satisfactory radiograph is made using 100 mA,0.2 sec,80 kVp,and 40-inch SID. How much exposure time is required to produce a similar radiograph when using 400 mA?

A) 0.05 sec
B) 0.08 sec
C) 0.1 sec
D) 0.4 sec

Question 25

A satisfactory radiograph is made using 200 mA,0.3 sec,90 kVp,and 72-inch SID. Which of the following techniques will produce a similar result at 40 inches SID?

A) 200 mA, 0.9 sec, 90 kVp
B) 200 mA, 0.09 sec, 90 kVp
C) 200 mA, 0.54 sec, 90 kVp
D) 200 mA, 0.16 sec, 90 kVp