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Radiographic Physics: X-Ray Tube Quiz

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Physics Quiz on Radiographic Physics: X-Ray Tube Quiz, created by Alexandra Ertmer on 25/10/2017.
Alexandra Ertmer
Quiz by Alexandra Ertmer, updated more than 1 year ago
Alexandra Ertmer
Created by Alexandra Ertmer about 7 years ago
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Resource summary

Question 1

Question
The x-ray intensity is lower on the anode side of the tube because of the:
Answer
  • Line Focus Principle
  • Heel Effect
  • Focusing Cup
  • Filament Length

Question 2

Question
Which of the following is (are) true regarding the protective housing of the x-ray tube?
Answer
  • Provides mechanical support for the x-ray tube.
  • Protects the tube from damage.
  • Aids in absorbing low energy radiation created within the x-ray tube.
  • All of the above

Question 3

Question
The negative side of the x-ray tube holds the:
Answer
  • Filament
  • Anode
  • Target
  • Rotor

Question 4

Question
Tube arcing is caused by:
Answer
  • A small focal spot
  • The angle of the anode
  • Tungsten collecting on the envelope of the tube
  • Not warming up the tube

Question 5

Question
A dual focus tube has two:
Answer
  • Anodes
  • Filaments
  • Rotors
  • Stators

Question 6

Question
An x-ray tube has a tube rating chart to show:
Answer
  • Housing cooling times
  • Anode cooling times
  • Maximum exposure times
  • Maximum patient doses

Question 7

Question
This device is located outside the glass envelope:
Answer
  • Stator
  • Rotor
  • Focal Spot
  • Filament

Question 8

Question
Which of the following is needed to produce an x-ray?
Answer
  • A source of electrons
  • A vacuum
  • A large potential difference
  • All the above

Question 9

Question
The tube current is changed by changing the:
Answer
  • Filament Current
  • Anode Voltage
  • Focal Spot Size
  • Exposure Time

Question 10

Question
A function of the cathode is to:
Answer
  • Be a focal spot
  • Produce an electrical connection to the rectifier
  • Produce a thermionic cloud
  • Rotate the anode

Question 11

Question
The function of the rotor & the stator assembly is to:
Answer
  • Create a vacuum
  • Insulate the anode
  • Rotate the anode
  • Produce a thermionic cloud

Question 12

Question
Each of the following is a part of the cathode assembly except the:
Answer
  • Stator
  • Filament
  • Focusing Cup
  • Associated Wiring

Question 13

Question
Each of the following is a material of choice for the filament except:
Answer
  • Copper
  • Tungsten
  • Rhenium
  • Molybdenum

Question 14

Question
Filament materials are chosen for their: 1)High Melting Point 2)Low Melting Point 3)Ability to Vaporize Easily 4)High Atomic Number
Answer
  • Numbers 1 & 3 only
  • Numbers 2 & 3 only
  • Numbers 1 & 4 only
  • Numbers 2 & 4 only
  • Numbers 1, 3, & 4 only

Question 15

Question
The focusing cup has a _______ charge.
Answer
  • Negative
  • Positive

Question 16

Question
The purpose of the focusing cup is to:
Answer
  • Alter the filament size
  • Group the electrons for their passage to the anode
  • Regulate anode rotation speed
  • Increase the heat capacity

Question 17

Question
X-ray production occurs at the:
Answer
  • Anode
  • Cathode
  • Filament
  • Stator

Question 18

Question
To extend the x-ray tube life, the technologist should: 1)Perform warm up exposures at the beginning of each day 2)Extend the time that the boost current (prep) button is held down 3)Avoid repeated exposures at or near the tube's capacity
Answer
  • 1 & 2 Only
  • 1 & 3 Only
  • 2 & 3 Only
  • 1, 2, & 3

Question 19

Question
When the anode angle is less than 45 degrees:
Answer
  • Effective focal spot is smaller than the actual focal spot
  • The actual focal spot of smaller than the effective focal spot
  • The angle has no effect on focal spot

Question 20

Question
The exact point in the x-ray unit where x-ray photons are created in:
Answer
  • Focusing Cup
  • Rotor
  • Filament
  • Focal Spot

Question 21

Question
To cover a 14x17 inch field at 40 inch SID, a ________ target angle is required.
Answer
  • 3 Degrees
  • 5 Degrees
  • 7 Degrees
  • 12 Degrees

Question 22

Question
The use of line focus principle causes a problem known as the ________.
Answer
  • Anode Heel Effect
  • Space Charge Effect
  • Quantum Mottle
  • Vacuum

Question 23

Question
The disadvantage of a small target angle is:
Answer
  • Increased heat distribution & capacity
  • Greater field coverage
  • A greater anode heel effect
  • A more uniform radiographic density

Question 24

Question
Warming the x-ray tube: 1)Is never necessary 2)Prevents cracking of the anode 3)Helps maintain the vacuum within the tube
Answer
  • 1 & 2 Only
  • 2 & 3 Only

Question 25

Question
Pitting of the anode commonly occurs:
Answer
  • Consistent low but very long exposures
  • Consistent single, high exposures
  • Failure to warm up the tube
  • All the Above

Question 26

Question
Anode melt might occur in a specific area on the anode due to:
Answer
  • The unit not being warmed up properly
  • Extended use
  • When the kVp is too high
  • When the stator fails & the rotor ceases to turn

Question 27

Question
The anode heel effect:
Answer
  • Exists because some x-rays are absorbed by the surface of the anode
  • Is caused by the charge difference between the anode & cathode
  • Depends on the mA & kVp
  • Is reduced by dual focal spot

Question 28

Question
The line focus principle:
Answer
  • Makes use of an angled cathode structure
  • Produces x-ray lines
  • Spreads the heat over a larger part if the anode

Question 29

Question
To best apply the anode heel effect, the anode should be placed towards which end of the body when performing an AP projection?
Answer
  • Towards the Knee
  • Towards the Hip

Question 30

Question
The vacuum created within the x-ray tube increase the efficiency of the tube's operation.
Answer
  • True
  • False

Question 31

Question
The cathode is the positive side of the x-ray tube.
Answer
  • True
  • False

Question 32

Question
The faster the anode rotation, the better the heat dissipation.
Answer
  • True
  • False

Question 33

Question
Many x-ray tubes have two filaments:
Answer
  • Because the second filament can be used as a spare part when the first is burned out
  • Provide two focal spots
  • To allow cooling of the filament by alternating exposures
  • To improve tube cooling by sharing the hear between two filaments

Question 34

Question
Modern general purpose radiographic equipment uses a stationary anode.
Answer
  • True
  • False

Question 35

Question
The most common diagnostic radiography target angle is 12 degrees.
Answer
  • True
  • False

Question 36

Question
The anode disk is composed of several different materials.
Answer
  • True
  • False

Question 37

Question
Changing the angle of the anode will change the effective focal spot.
Answer
  • True
  • False

Question 38

Question
One way to extend tube life is by using high mA stations when possible.
Answer
  • True
  • False
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