Equipment

A particular radiograph was produced using 12 mAs and 85 kVp with a 16:1 ratio grid. The radiograph is to be repeated using an 8:1 ratio grid. What should be the new mAs?

A. 10

B. 8

C. 6

D. 3

8 mAs

Which of the following is (are) tested as part of a quality assurance (QA) program?


1. Beam alignment
2. Reproducibility
3. Linearity

A. 1 only

B. 1, 2, and 3

C. 1 and 3

D. 1 and 2

1, 2, and 3

Which of the following groups of exposure factors will produce the least radiographic density?

A. 100 mA, 50 ms

B. 200 mA, 40 ms

C. 400 mA, 50 ms

D. 600 mA, 30 ms

100 mA, 50 ms

If a technologist is receiving 300 mR/hr standing 15 feet from the patient during fluoroscopy, how close is the technologist standing if the rate is decreased to 20 mR/hr?

A. 3,375 ft

B. 350 ft

C. 58.1 ft

D. 25 ft

58\.1 ft

If a technologist is receiving 100 mR/hr standing 1 foot from the patient during fluoroscopy, what is his rate of exposure when he steps back to a distance of 2 feet from the patient?

A. 100 mR/hr

B. 50 mR/hr

C. 25 mR/hr

D. 200 mR/hr

25 mR/hr

The line focus principle expresses the relationship between:

A. Exposure given the IR and resulting density

B. SID used and resulting density

C. Grid ratio and lines per inch

D. The actual and effective focal spot

The actual and effective focal spot

The minimum source-to-skin distance for portable radiograph is:

A. At least 12 inches

B. At least 15 inches

C. At least 40 inches

D. At least 72 inches

At least 12 inches (30 cm)

The radiation dose 6 feet from the x-ray table is 5 R, what is the dose at a distance of 3 feet?

A. 10 R

B. 2.5 R

C. 20 R

D. 1.25 R

20 R

Double-focus x-ray tubes have two

A. Port windows

B. Filaments

C. Anodes

D. Rectifiers

Filaments

An electric circuit contains 20 amps and 6 ohms. What is the voltage?

A. 26

B. 12

C. 3.33

D. 120

120 V

The resistance in an electric circuit containing 100 volts and 15 amps is 6.7

A. True

B. False

True

An electric circuit contains 15 amps and 7.5 ohms. What is the power produced?

A. 112.5 watts

B. 30 watts

C. 30 watts

D. 1688 watts

1688 watts

What is the velocity of a javelin that travels 45 meters in 3 seconds?

A. 67 m/s

B. 0.067 m/s

C. 135 m/s

D. 15 m/s

15 m/s

What is the momentum of a 30 kg object traveling at 2.5 m/s?

A. 150 kg-m/s

B. 75 kg-m/s

C. 12 kg-m/s

D. 187.5 kg-m/s

75 kg-m/s

If a toaster produces 12 ohms of resistance in a 120-volt circuit, what is the amount of current in the circuit?

A. 25

B. 10

C. 1440

D. 0.1

10

How much current is in a circuit that includes a 9-volt battery and a bulb with a resistance of 3 ohms?

A. 0.33

B. 27

C. 30

D. 3

3

Based on the image shown, what is the total resistance?

A. 3

B. 18

C. 10

D. 5

18

Based on the image shown and your calculation of the total resistance in the previous question, what is the current?

A. 3 A

B. 0.5 A

C. 05 A

D. 0.3 A

0\.5 A

Using the image shown, what is the total voltage?

A. 9

B. 2

C. 10

D. 1

9

Based on the image shown and your previous answer, what is the total resistance in the circuit?

A. 9

B. 0.625

C. 14.4

D. 625

625

According to Ohm’s law, what would be the resistance if the voltage is 110 volt and the current is 5 amperes?

A. 55 ohm

B. 220 ohm

C. 550 ohm

D. 22 ohm

22 ohm

According to Ohm’s law, what would be the current if the voltage is 12 volts and the resistance is 1.5 ohms?

A. 6 amps

B. 2 amps

C. 4 amps

D. 8 amps

8 amps

As frequency increases, energy decreases

A. True

B. False

False

As the wave’s frequency increases, the wavelength

A. Stays the same

B. It depends on the type of electromagnetic radiation

C. Decreases

D. Increases

Decreases

The inverse square law relates the intensity (of light/x-rays) to

A. Mass

B. Distance

C. Velocity

D. Time

Distance

All electromagnetic radiation travels at the same speed

A. True

B. False

True

In the SI system, the unit of measurement for mass is:

A. gram

B. kilogram

C. ton

D. pound

Kilogram

Newton is the unit of measurement of:

A. Acceleration

B. Momentum

C. Velocity

D. Force

Force

The principle of inertia was first described by:

A. Wilhelm Conrad Roentgen

B. Thomas Alva Edison

C. Sir Isaac Newton

D. Crookes

Sir Isaac Newton

The __ is the SI unit equivalent to the rad:

A. Gray

B. Roentgen

C. Rem

D. Becquerel

Gray

The __ is the SI unit equivalent to the rem:

A. Roentgen

B. Seivert

C. Rad

D. Curie

Seivert

1 roentgen = ___

A. 2.58 x 104 C/kg

B. 2.58 x 103 C/kg

C. 2.58 x 10-4 C/kg

D. 2.58 x 10-3 C/kg

2\.58 x 10-4 C/kg

The component of the nucleus that has a positive charge and mass is the:

A. Proton

B. Neutron

C. Electron

Proton

When the bond between two atoms is due to one atom giving up an electron and the other atom gaining an electron, it is called a:

A. Compounding bond

B. Covalent bond

C. Ionic bond

D. Molecular bond

Ionic bond

Which of the following groups of exposure factors will produce the least radiographic density?

A. 400 mA, 50 ms

B. 100 mA, 50 ms

C. 200 mA, 40 ms

D. 600 mA, 30 ms

100 mA, 50 ms

Exposure factors of 90 kVp and 3 mAs are used for a particular nongrid exposure. What should be the new mAs value if a 12:1 grid is added?

A. 9

B. 86

C. 12

D. 15

15

During CR, the latent image present on the image plate is changed to a computerized image by the:

A. PSP

B. ADC

C. Scanner-reader

D. Helium-neon laser

ADC

A 15% decrease in kVp accompanied by a 50% increase in mAs will result in a(n):

A. Increase in radiographic density

B. Increase in exposure latitude

C. Decrease in recorded detail

D. Shorter scale of contrast

Shorter scale of contrast

Which of the following causes pitting, or many small surface melts, of the anode’s focal track?

A. Repeated, frequent overloading

B. Loss of anode rotation

C. A large amount of heat to a cold anode

D. Vaporized tungsten on the glass envelope

Repeated, frequent overloadign

If the primary coil of a high-voltage transformer is supplied by 220 V and has 400 turns, and the secondary coil has 100,000 turns, what is the voltage induced in the secondary coil?

A. 80 kV

B. 55 kV

C. 80 V

D. 55 V

55 kV

Self-induction is used in the operation of what device?

A. Autotransformer

B. Step-up transformer

C. Step-down transformer

D. Electronic timer

Autotransformer

The primary advantage of three-phase power is that:

A. Voltage drops to zero only 12 times per second

B. Voltage drops to zero only six times per second

C. Voltage is always at peak value

D. Voltage never drops to zero

Voltage never drops to zero

A spinning-top device can be used to evaluate:


1. Timer accuracy
2. Rectifier failure
3. The effect of peak kV on contrast

A. 1 and 2 only

B. 1, 2, and 3

C. 1 only

D. 2 only

1 and 2 only

The height of a sine wave is called:

A. Frequency

B. Wavelength

C. Amplitude

D. Altitude

Amplitude

The number of x-ray waves passing a given point per unit of time is called:

A. Altitude

B. Amplitude

C. Frequency

D. Wavelength

Frequency

Grids that have strips angled to coincide with divergence of the x-ray beam are called:

A. Crosshatch

B. Rhombic

C. Focused

D. Parallel

Focused

When a grid is used, what technical factor must be increased to compensate for the loss of image-forming rays?

A. Distance

B. kVp

C. mAs

D. Time

mAs

Grid ratio is expressed as:

A. Height of the Pb strips to the space between them

B. Height of the Al strips to the space between them

C. Length of the Pb strips to the space between them

D. Height of the interspaces to the Pb strips

Height of the Pb strips to the space between them

A digital image is composed of rows and columns known as a:

A. Cyborg assimilator

B. Matrix

C. Digital

D. Photonic image

Matrix

Calculate the voltage output by the secondary winding of a transformer if the primary voltage is 35 volts, the secondary winding has 4500 turns and the primary winding has 355 turns

A. 443.7 kw

B. 443.7 v

C. 4.43 v

D. 43.37 v

443\.7 v

The current in the primary coil is 15 A with 100 turns. There are 25 A on the secondary coil, how many turns are there in the secondary?

A. 16.7

B. 60

C. 150

D. 166.7

60

“nerd :) goes for all of you, too”

\- my youngest sister (was directed at me, but y’all stay humble too)

How many HU are generated by an exposure of 70 kVp, 300 mA, and 0.15 seconds on a 3 phase 12 pulse unit?

A. 4441.5

B. 3150

C. 4252.5

D. 21,000

4441\.5

Optimal density is achieved at an SID of 40 inches using 25 mAs. The SID must be increased to 56 inches. What will the new mAs be adjusted to in order to maintain optimal density in the radiograph?

A. 49

B. 40

C. 12.75

D. 32

49

Optimal density is achieved at an SID of 52 inches using 5 mAs. The mAs was changed to 10 for optimal density on the radiograph. What change in SID must be used to compensate for the increase in mAs?

A. 73.5 inches

B. 40 inches

C. 72 inches

D. 52 inches

73\.5 inches

What is the conversion of 85,000 volts to kilovolts?

A. 8.5

B. 850

C. 85

D. 8500

85