Deck 2: The Dental X-Ray Machine

Question 1

The quantity of x-ray photons produced is determined by the kilovolt setting.

Answer 1

False

Question 2

Which of the following is used in the high-voltage circuit?

A)A fuse
B)A rectifier
C)A step-up transformer
D)A step-down transformer

Answer 2

A step-up transformer

Question 3

All of the following are on the control panel of the dental x-ray machine EXCEPT one.Which one is the EXCEPTION?

A)Transformer
B)mA selector
C)Indicator light
D)Exposure button

Answer 3

Transformer

Question 4

The unit of measurement used to describe the amount of electric current flowing through a circuit is called ampere.

Question 5

The quality of the x-ray photons is determined by the milliamperage.

Question 6

Which of the following is true regarding a collimated rectangular beam?

A)Covers greater facial area.
B)Exposes patient to more primary radiation.
C)Can be accomplished without an increase in cone cutting.
D)Cannot be accomplished without an increase in cone cutting.

Question 7

The thickness of aluminum that will reduce the intensity of the x-ray beam by 50% is termed:

A)filtration.
B)collimation.
C)half-value layer.
D)penetrating power.

Question 8

Which of the following removes the long,nonpenetrating wavelength x-rays from the primary beam?

A)Transformer
B)Rectification
C)Direct current
D)Aluminum filter

Question 9

Pointed,plastic cones are not used in dental radiology because:

A)the cones are difficult for the practitioner to line up correct anatomic structures.
B)the cones cause the production of excess secondary and scatter radiation.
C)the cones require a higher kVp setting on the control panel.
D)the cones require an increase in the time setting.

Question 10

The determination of the size and shape of the x-ray beam is called collimation.

Question 11

During phase 1 of x-ray production,the step-up transformer increases the 110V (or 220V)to the 65,000 to 100,000 volts which is necessary to accelerate the movement across the tube.During phase 2,the current activates the filament circuit and the step-down transformer 110V (or 220V)is then reduced to 3 to 5V by the step-down transformer.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second is false.
D)The first statement is false,the second is true.

Question 12

Position-indicating device (PID)should be lead-lined to prevent the escape of scatter radiation.PIDs are always 16-inches long.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second is false.
D)The first statement is false,the second is true.

Question 13

A diagnostic film is made at 10 mA and 4 impulses.The exposure that would produce the same image at 5 mA would be:

A)5 impulses.
B)8 impulses.
C)10 impulses.
D)45 impulses.

Question 14

X-rays are produced by impulses and not by a steady stream.

Question 15

All of the following are parameters of the dental x-ray beam that are adjusted from the control panel EXCEPT one.Which one is the EXCEPTION?

A)The collimation of the x-ray beam
B)The energy or penetrating power (quality)
C)The number of x-rays produced (quantity)
D)The length of time x-rays will be produced

Question 16

If the useful beam is not centered on the film in the patient's mouth,the result will be:

A)elongation.
B)overlapping.
C)foreshortening.
D)collimator cutoff.

Question 17

When the alternating current is supplied to the x-ray tube,it is considered to be which of the following?

A)Cycle
B)Voltage
C)Impulses
D)Self-rectified

Question 18

When a current flows in one direction and then reverses and flows in the opposite direction in the circuit,it is referred to as:

A)direct current.
B)electric current.
C)alternating current.
D)ratification of current.

Question 19

The standard of care in radiation risk prevention calls for open-ended,lead-lined PIDs.Radiation protection codes in almost all states have required the use of open-ended PIDs.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second is false.
D)The first statement is false,the second is true.

Question 20

If a radiograph is described as "underpenetrated," then the error must be:

A)too little mA.
B)excessive mA.
C)too little kVp.
D)excessive kVp.