Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

X-rays originate at the:

Accepted Answer

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

Question 4

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 5

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 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)  Milliamperage 
A)  Target size 
B)  Kilovoltage 
C)  Exposure time 
D)  Milliamperage

Question 7

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 8

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

Accepted Answer

A) True 
 B)False

Question 9

Sixty (60) impulses is equivalent to:

Accepted Answer

A)  1/6 second. 
B)  1/10 second. 
C)  ½ second. 
D)  1 second. 
A)  1/6 second. 
B)  1/10 second. 
C)  ½ second. 
D)  1 second.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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. 
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.

Question 12

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

Accepted Answer

Required by law, the purpose o

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 head 
A)  Control panel 
B)  Extension arm 
C)  Radioactive material 
D)  Tube head

Question 15

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

Accepted Answer

A focusing cup made of molybde

Question 16

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

Accepted Answer

Thermionic emission

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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. 
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.

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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. 
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.

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

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

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

X-rays originate at the:

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

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

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

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

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

Sixty (60) impulses is equivalent to:

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

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

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

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

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

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

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

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

Which of these statements is FALSE?

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

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

Dental Radiography: Historical Perspective and Future Trends

Characteristics and Measurement of Radiation

Factors Affecting Radiographic Quality

Effects of Radiation Exposure

Radiation Protection

Dental X-Ray Film and Processing Methods

Digital Radiography and Image Acquisition

Infection Control

Legal and Ethical Responsibilities

Patient Relations and Education

Introduction to Radiographic Examinations

The Periapical Examinationparalleling Technique

The Periapical Examinationbisecting Technique

The Bitewing Examination

The Occlusal Examination

The Panoramic Examination

Identifying and Correcting Undiagnostic Radiographs

Quality Control and Environmental Safety in Dental Radiography

Image Orientation and Introduction to Interpretation

Recognizing Normal Radiographic Anatomy Intraoral Radiographs

Recognizing Normal Radiographic Anatomy Panoramic Radiographs

Radiographic Appearance of Dental Materials and Foreign Objects

The Use of Radiographs in the Detection of Dental Caries

The Use of Radiographs in the Evaluation of Periodontal Diseases

Describing Radiographic Anomalies, Lesions, and Opportunistic Screening

Pediatric Radiographic Techniques

Radiographic Techniques for Patients With Special Needs

Radiographic Techniques for Specific Oral Conditions

Radiographic Techniques

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