Question 1

Which of the following best describes how x-rays are actually produced in the dental x-ray tube?

Accepted Answer

A)   Radioactive particulate matter undergoes controlled disintegration.
B)   Electrical current passes through an oil mixture, creating minute explosions.
C)   Low milliamperage current is transformed to high kilovoltage current.
D)   High-speed electrons collide with target material electrons.E) C) and D)
F) A) and B)

Question 2

Dental x-ray machines may have controls for manual adjustment of kVp and mA, or these controls may be preset by the manufacturer.

Accepted Answer

A) True 
 B)False

Question 3

The anode is the negative electrode (terminal) in the x-ray tube.

Accepted Answer

A) True 
 B)False

Question 4

The intensity of the beam refers to the quantity and quality of the x-rays.

Accepted Answer

A) True 
 B)False

Question 5

An x-ray beam composed of many different wavelengths is called "polychromatic."

Accepted Answer

A) True 
 B)False

Question 6

The intensity of the x-ray beam is affected by each of the following EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

A)   Target size
B)   Kilovoltage
C)   Exposure time
D)   MilliamperageE) A) and D)
F) None of the above

Question 7

What is the purpose of a "deadman" exposure switch?

Accepted Answer

Required by law, the purpose o...

Question 8

The step-down transformer corrects fluctuations in the current flowing through the x-ray machine.

Accepted Answer

A) True 
 B)False

Question 9

In the ON position, the line switch on the control panel energizes the low- and high-voltage circuits.

Accepted Answer

A) True 
 B)False

Question 10

That part of the cathode designed to direct the free electrons toward the tungsten target of the anode is called the "focal spot."

Accepted Answer

A) True 
 B)False

Question 11

In the cathode, the wire filament is recessed into what?

Accepted Answer

A focusing cup made of molybde...

Question 12

Thermionic emission refers to the release of electrons from the target material during the process of incandescence.

Accepted Answer

A) True 
 B)False

Question 13

The metal housing of the tube head increases the safety of the x-ray machine.

Accepted Answer

A) True 
 B)False

Question 14

What is the term for the process by which electrons are created at the filament wire of the cathode?

Accepted Answer

Thermionic emission ...

Question 15

The anode is composed of the focusing cup and the filament, and must be charged negative during x-ray production.

Accepted Answer

A)   The first part of the statement is correct, the second part of the statement is NOT correct.
B)   The first part of the statement is NOT correct, the second part of the statement is correct.
C)   Both parts of the statement are correct.
D)   Both parts of the statement are NOT correct.E) C) and D)
F) B) and C)

Question 16

The filament is on the negative side of the vacuum tube in the dental x-ray machine.

Accepted Answer

A) True 
 B)False

Question 17

Which of these statements is FALSE?

Accepted Answer

A)   The positive anode and negative cathode are sealed within the x-ray tube.
B)   The control panel may be integrated with the x-ray machine tube head support.
C)   The exposure button should be on the end of a 3-foot timer cord.
D)   The x-ray tube contains a target capable of stopping the electrons.E) A) and B)
F) All of the above

Question 18

Sixty (60)  impulses is equivalent to:

Accepted Answer

A)   1/6 second.
B)   1/10 second.
C)   ½ second.
D)   1 second.E) A) and D)
F) All of the above

Question 19

X-rays originate at the:

Accepted Answer

A)   cathode.
B)   port.
C)   focusing cup.
D)   focal spot.E) B) and D)
F) A) and D)

Question 20

Dental x-ray machines contain each of the following components EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

A)   Control panel
B)   Extension arm
C)   Radioactive material
D)   Tube headE) C) and D)
F) B) and D)

Exam 3: The Dental X-Ray Machine: Components and Function

The step-down transformer corrects fluctuations in the current flowing through the x-ray machine.

Correct AnswerverifiedShow Answer

The metal housing of the tube head increases the safety of the x-ray machine.

Correct AnswerverifiedShow Answer

Dental x-ray machines may have controls for manual adjustment of kVp and mA, or these controls may be preset by the manufacturer.

Correct AnswerverifiedShow Answer

Which of these statements is FALSE?

Correct AnswerverifiedShow Answer

What is the purpose of a "deadman" exposure switch?

Correct AnswerverifiedRequired by law, the purpose o...View AnswerShow Answer

That part of the cathode designed to direct the free electrons toward the tungsten target of the anode is called the "focal spot."

Correct AnswerverifiedShow Answer

The filament is on the negative side of the vacuum tube in the dental x-ray machine.

Correct AnswerverifiedShow Answer

In the cathode, the wire filament is recessed into what?

Correct AnswerverifiedA focusing cup made of molybde...View AnswerShow Answer

What is the term for the process by which electrons are created at the filament wire of the cathode?

Correct AnswerverifiedThermionic emission ...View AnswerShow Answer

Which of the following best describes how x-rays are actually produced in the dental x-ray tube?

Correct AnswerverifiedShow Answer

Dental x-ray machines contain each of the following components EXCEPT one. Which one is the EXCEPTION?

Correct AnswerverifiedShow Answer

Sixty (60) impulses is equivalent to:

Correct AnswerverifiedShow Answer

X-rays originate at the:

Correct AnswerverifiedShow Answer

An x-ray beam composed of many different wavelengths is called "polychromatic."

Correct AnswerverifiedShow Answer

In the ON position, the line switch on the control panel energizes the low- and high-voltage circuits.

Correct AnswerverifiedShow Answer

The anode is the negative electrode (terminal) in the x-ray tube.

Correct AnswerverifiedShow Answer

The intensity of the beam refers to the quantity and quality of the x-rays.

Correct AnswerverifiedShow Answer

The intensity of the x-ray beam is affected by each of the following EXCEPT one. Which one is the EXCEPTION?

Correct AnswerverifiedShow Answer

Thermionic emission refers to the release of electrons from the target material during the process of incandescence.

Correct AnswerverifiedShow Answer

The anode is composed of the focusing cup and the filament, and must be charged negative during x-ray production.

Correct AnswerverifiedShow Answer

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Required by law, the purpose o...
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A focusing cup made of molybde...
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Thermionic emission ...
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