Quiz
Radiographic Physics: X-Ray Tube Quiz
Questions in this quiz (38)
1The x-ray intensity is lower on the anode side of the tube because of the:
- ALine Focus Principle
- BHeel Effect
- CFocusing Cup
- DFilament Length
2Which of the following is (are) true regarding the protective housing of the x-ray tube?
- AProvides mechanical support for the x-ray tube.
- BProtects the tube from damage.
- CAids in absorbing low energy radiation created within the x-ray tube.
- DAll of the above
3The negative side of the x-ray tube holds the:
- AFilament
- BAnode
- CTarget
- DRotor
4Tube arcing is caused by:
- AA small focal spot
- BThe angle of the anode
- CTungsten collecting on the envelope of the tube
- DNot warming up the tube
5A dual focus tube has two:
- AAnodes
- BFilaments
- CRotors
- DStators
6An x-ray tube has a tube rating chart to show:
- AHousing cooling times
- BAnode cooling times
- CMaximum exposure times
- DMaximum patient doses
7This device is located outside the glass envelope:
- AStator
- BRotor
- CFocal Spot
- DFilament
8Which of the following is needed to produce an x-ray?
- AA source of electrons
- BA vacuum
- CA large potential difference
- DAll the above
9The tube current is changed by changing the:
- AFilament Current
- BAnode Voltage
- CFocal Spot Size
- DExposure Time
10A function of the cathode is to:
- ABe a focal spot
- BProduce an electrical connection to the rectifier
- CProduce a thermionic cloud
- DRotate the anode
11The function of the rotor & the stator assembly is to:
- ACreate a vacuum
- BInsulate the anode
- CRotate the anode
- DProduce a thermionic cloud
12Each of the following is a part of the cathode assembly except the:
- AStator
- BFilament
- CFocusing Cup
- DAssociated Wiring
13Each of the following is a material of choice for the filament except:
- ACopper
- BTungsten
- CRhenium
- DMolybdenum
14Filament materials are chosen for their:
1)High Melting Point
2)Low Melting Point
3)Ability to Vaporize Easily
4)High Atomic Number- ANumbers 1 & 3 only
- BNumbers 2 & 3 only
- CNumbers 1 & 4 only
- DNumbers 2 & 4 only
- ENumbers 1, 3, & 4 only
15The focusing cup has a _______ charge.
- ANegative
- BPositive
16The purpose of the focusing cup is to:
- AAlter the filament size
- BGroup the electrons for their passage to the anode
- CRegulate anode rotation speed
- DIncrease the heat capacity
17X-ray production occurs at the:
- AAnode
- BCathode
- CFilament
- DStator
18To 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- A1 & 2 Only
- B1 & 3 Only
- C2 & 3 Only
- D1, 2, & 3
19When the anode angle is less than 45 degrees:
- AEffective focal spot is smaller than the actual focal spot
- BThe actual focal spot of smaller than the effective focal spot
- CThe angle has no effect on focal spot
20The exact point in the x-ray unit where x-ray photons are created in:
- AFocusing Cup
- BRotor
- CFilament
- DFocal Spot
21To cover a 14x17 inch field at 40 inch SID, a ________ target angle is required.
- A3 Degrees
- B5 Degrees
- C7 Degrees
- D12 Degrees
22The use of line focus principle causes a problem known as the ________.
- AAnode Heel Effect
- BSpace Charge Effect
- CQuantum Mottle
- DVacuum
23The disadvantage of a small target angle is:
- AIncreased heat distribution & capacity
- BGreater field coverage
- CA greater anode heel effect
- DA more uniform radiographic density
24Warming the x-ray tube:
1)Is never necessary
2)Prevents cracking of the anode
3)Helps maintain the vacuum within the tube- A1 & 2 Only
- B2 & 3 Only
25Pitting of the anode commonly occurs:
- AConsistent low but very long exposures
- BConsistent single, high exposures
- CFailure to warm up the tube
- DAll the Above
26Anode melt might occur in a specific area on the anode due to:
- AThe unit not being warmed up properly
- BExtended use
- CWhen the kVp is too high
- DWhen the stator fails & the rotor ceases to turn
27The anode heel effect:
- AExists because some x-rays are absorbed by the surface of the anode
- BIs caused by the charge difference between the anode & cathode
- CDepends on the mA & kVp
- DIs reduced by dual focal spot
28The line focus principle:
- AMakes use of an angled cathode structure
- BProduces x-ray lines
- CSpreads the heat over a larger part if the anode
29To best apply the anode heel effect, the anode should be placed towards which end of the body when performing an AP projection?
- ATowards the Knee
- BTowards the Hip
30The vacuum created within the x-ray tube increase the efficiency of the tube's operation.
- ATrue
- BFalse
31The cathode is the positive side of the x-ray tube.
- ATrue
- BFalse
32The faster the anode rotation, the better the heat dissipation.
- ATrue
- BFalse
33Many x-ray tubes have two filaments:
- ABecause the second filament can be used as a spare part when the first is burned out
- BProvide two focal spots
- CTo allow cooling of the filament by alternating exposures
- DTo improve tube cooling by sharing the hear between two filaments
34Modern general purpose radiographic equipment uses a stationary anode.
- ATrue
- BFalse
35The most common diagnostic radiography target angle is 12 degrees.
- ATrue
- BFalse
36The anode disk is composed of several different materials.
- ATrue
- BFalse
37Changing the angle of the anode will change the effective focal spot.
- ATrue
- BFalse
38One way to extend tube life is by using high mA stations when possible.
- ATrue
- BFalse
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- Physics Quiz on Radiographic Physics: X-Ray Tube Quiz, created by Alexandra Ertmer on 25/10/2017.
- Author
- Alexandra Ertmer
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- English
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