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MEAGHAN PIRETTI STUDY GUIDE EXAM 2026- QUESTIONS
LATEST 2026 – 2027 VERSION SOLVED QUESTIONS &
ANSWERS
Meaghan Piretti Study Guide: Questions with Rationales
SECTION A: X-RAY TUBE COMPONENTS (Questions 1-25)
1. Which side of the x-ray tube is negative?
A) Anode
B) Cathode
C) Stator
D) Rotor
Answer: B) Cathode
Rationale: The cathode is the negative side of the x-ray tube. It contains the filament
that undergoes thermionic emission, releasing electrons that are attracted to the
positive anode during x-ray production.
2. Which side of the x-ray tube is positive?
A) Cathode
B) Filament side
C) Anode
D) Focusing cup side
Answer: C) Anode
Rationale: The anode serves as the positive electrode in the x-ray tube, attracting
electrons from the cathode and converting their kinetic energy into x-ray photons and
heat through interactions with the tungsten target material.
3. What is the role of the glass envelope in the x-ray tube?
A) To focus the electron beam
B) To provide structural support for the rotor
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C) To contain and maintain the vacuum
D) To prevent heat from escaping
Answer: C) To contain and maintain the vacuum
Rationale: The glass envelope provides a sealed, evacuated environment that prevents
electron collisions with gas molecules, ensuring efficient electron flow from cathode to
anode without scattering or arcing. This vacuum is essential for proper x-ray production.
4. What is the role of tube housing?
A) To focus the electron beam
B) To produce x-rays
C) To support and protect the tube, restrict leakage, and provide insulation
D) To convert electrical energy to mechanical energy
Answer: C) To support and protect the tube, restrict leakage, and provide insulation
Rationale: The tube housing supports and protects the x-ray tube, restricts leakage
radiation, and provides electrical insulation, ensuring safe operation.
5. Which end of the x-ray tube contains the filament and focusing cup?
A) Anode end
B) Stator end
C) Cathode end
D) Rotor end
Answer: C) Cathode end
Rationale: The cathode end houses the filament that undergoes thermionic emission
and the focusing cup that shapes and directs the electron stream toward the anode
target for x-ray production.
6. What are the two types of anodes used in x-ray tubes?
A) Fixed and variable
B) Rotating and stationary
C) Copper and tungsten
D) Conductive and insulative
Answer: B) Rotating and stationary
Rationale: Rotating anodes dissipate heat over a larger surface area, enabling higher
tube loading capacities, while stationary anodes are simpler designs used in portable or
dental units with lower heat requirements.
7. What is a stationary anode?
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A) An anode that rotates to spread heat
B) An anode where electrons always hit the same spot, building heat that can cause
damage
C) An anode that uses a magnetic field to rotate
D) An anode that is only used in portable units
Answer: B) An anode where electrons always hit the same spot, building heat that
can cause damage
Rationale: In a stationary anode, electrons continuously strike the same focal spot,
which can cause heat buildup and potential damage. This design is limited to lower-
output applications.
8. What is a rotating anode?
A) An anode that is stationary and fixed
B) An anode that rotates to spread the heat produced from x-ray reaction over a large
area
C) An anode that uses a different target material
D) An anode that produces less radiation
Answer: B) An anode that rotates to spread the heat produced from x-ray reaction
over a large area
Rationale: A rotating anode spins during exposure, distributing heat over a larger surface
area, extending tube life and allowing higher tube loading capacities.
9. What is the anode made of?
A) Copper and aluminum
B) Tungsten and rhenium
C) Molybdenum and graphite
D) Lead and steel
Answer: B) Tungsten and rhenium
Rationale: The anode is made of a tungsten-rhenium alloy. Tungsten is chosen for its
high atomic number and high melting point, while rhenium helps prevent cracking under
thermal stress.
10. Why is tungsten with rhenium the preferred material for the anode?
A) It is inexpensive and easy to machine
B) It has a high atomic number and high melting point
C) It conducts electricity better than copper
D) It is lightweight and durable
Answer: B) It has a high atomic number and high melting point
MEAGHAN PIRETTI STUDY GUIDE EXAM 2026- QUESTIONS
LATEST 2026 – 2027 VERSION SOLVED QUESTIONS &
ANSWERS
Meaghan Piretti Study Guide: Questions with Rationales
SECTION A: X-RAY TUBE COMPONENTS (Questions 1-25)
1. Which side of the x-ray tube is negative?
A) Anode
B) Cathode
C) Stator
D) Rotor
Answer: B) Cathode
Rationale: The cathode is the negative side of the x-ray tube. It contains the filament
that undergoes thermionic emission, releasing electrons that are attracted to the
positive anode during x-ray production.
2. Which side of the x-ray tube is positive?
A) Cathode
B) Filament side
C) Anode
D) Focusing cup side
Answer: C) Anode
Rationale: The anode serves as the positive electrode in the x-ray tube, attracting
electrons from the cathode and converting their kinetic energy into x-ray photons and
heat through interactions with the tungsten target material.
3. What is the role of the glass envelope in the x-ray tube?
A) To focus the electron beam
B) To provide structural support for the rotor
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C) To contain and maintain the vacuum
D) To prevent heat from escaping
Answer: C) To contain and maintain the vacuum
Rationale: The glass envelope provides a sealed, evacuated environment that prevents
electron collisions with gas molecules, ensuring efficient electron flow from cathode to
anode without scattering or arcing. This vacuum is essential for proper x-ray production.
4. What is the role of tube housing?
A) To focus the electron beam
B) To produce x-rays
C) To support and protect the tube, restrict leakage, and provide insulation
D) To convert electrical energy to mechanical energy
Answer: C) To support and protect the tube, restrict leakage, and provide insulation
Rationale: The tube housing supports and protects the x-ray tube, restricts leakage
radiation, and provides electrical insulation, ensuring safe operation.
5. Which end of the x-ray tube contains the filament and focusing cup?
A) Anode end
B) Stator end
C) Cathode end
D) Rotor end
Answer: C) Cathode end
Rationale: The cathode end houses the filament that undergoes thermionic emission
and the focusing cup that shapes and directs the electron stream toward the anode
target for x-ray production.
6. What are the two types of anodes used in x-ray tubes?
A) Fixed and variable
B) Rotating and stationary
C) Copper and tungsten
D) Conductive and insulative
Answer: B) Rotating and stationary
Rationale: Rotating anodes dissipate heat over a larger surface area, enabling higher
tube loading capacities, while stationary anodes are simpler designs used in portable or
dental units with lower heat requirements.
7. What is a stationary anode?
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A) An anode that rotates to spread heat
B) An anode where electrons always hit the same spot, building heat that can cause
damage
C) An anode that uses a magnetic field to rotate
D) An anode that is only used in portable units
Answer: B) An anode where electrons always hit the same spot, building heat that
can cause damage
Rationale: In a stationary anode, electrons continuously strike the same focal spot,
which can cause heat buildup and potential damage. This design is limited to lower-
output applications.
8. What is a rotating anode?
A) An anode that is stationary and fixed
B) An anode that rotates to spread the heat produced from x-ray reaction over a large
area
C) An anode that uses a different target material
D) An anode that produces less radiation
Answer: B) An anode that rotates to spread the heat produced from x-ray reaction
over a large area
Rationale: A rotating anode spins during exposure, distributing heat over a larger surface
area, extending tube life and allowing higher tube loading capacities.
9. What is the anode made of?
A) Copper and aluminum
B) Tungsten and rhenium
C) Molybdenum and graphite
D) Lead and steel
Answer: B) Tungsten and rhenium
Rationale: The anode is made of a tungsten-rhenium alloy. Tungsten is chosen for its
high atomic number and high melting point, while rhenium helps prevent cracking under
thermal stress.
10. Why is tungsten with rhenium the preferred material for the anode?
A) It is inexpensive and easy to machine
B) It has a high atomic number and high melting point
C) It conducts electricity better than copper
D) It is lightweight and durable
Answer: B) It has a high atomic number and high melting point
