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Rad135 Final Exam Review- Part 1
Test Description: This content covers several chapters from the text to help you prepare for the final exam in Rad135.
Instructions: Answer all questions to get your test result.
1) What is the name given to the shallow depression in the cathode assembly?
A
dual focus
B
filament
C
focusing cup
D
focal spot
2) Which of the following best describes the circular path that will be struck by the electron beam in the x-ray tube?
A
focal track
B
focusing cup
C
cathode
D
anode
3) Which of the following materials must be utilized to fill the space between the envelope and the tube housing?
A
silicon
B
air
C
dielectric oil
D
argon gas
4) What type of unit has the x-ray tube and bucky tray travelling in opposite arcs during exposure?
A
tomographic unit
B
simulator unit
C
mammography unit
D
magnetic resonance unit
5) Single phase generators that have full-wave rectification create a voltage ripple of how many pulses per Hertz (120 pulses per second)?
A
6
B
12
C
4
D
2
6) According to US Public Law 90-602, for exposures above 50 kVp, the exposure must not exceed what milliampere-seconds (mAs)?
A
400
B
500
C
depends on the exam and patient's body habitus
D
600
7) Nearly all x-ray equipment operates from an incoming line of how many volts?
A
210-220
B
400-500
C
70-100
D
250-300
8) What circuit modifies the incoming line power to generate the thermionic emission in the filament wire of the x-ray tube?
A
timer circuit
B
primary circuit
C
filament circuit
D
anode circuit
9) A full-wave rectified, three phase, six-pulse waveform has about what percent voltage ripple?
A
4%
B
40%
C
80%
D
13%
10) Which of the following is the most costly tube suspension system?
A
floor-to-ceiling mounted
B
floor mounted
C
mobile system
D
overhead suspension system
11) What is the range, in milliamperes (mA), of a diagnostic x-ray unit?
A
20-210 mA
B
400-800 mA
C
30-300 mA
D
10-1200 mA
12) Which device or component on an x-ray table holds the cassette/detector in place?
A
table top
B
ancillary equipment
C
bucky tray
D
overhead support
13) What is the power rating in kilowatts (kW) for a three-phase generator that is able to deliver 100 kVp at 1,500 mA?
A
150 kW
B
15,000 kW
C
1500 kW
D
15 kW
14) Which of the following is the more likely cause of x-ray tube breakdown?
A
loss of vacuum
B
crack in glass envelope
C
melting of rotor
D
filament breakage
15) Which of the following is the most common material used for filtering the x-ray beam?
A
steel
B
lead
C
aluminum
D
tungsten
16) Which of the following is not part of the cathode assembly?
A
stator
B
focusing cup
C
filament associated wiring
D
filament
17) Cracking of the anode typically occurs ____.
A
when the anode is off-focus
B
when a cold anode is hit with a high kVp exposure
C
with extended use
D
when the cathode cup touches the anode, causing a short
18) Leakage radiation from the lead-lined housing must not exceed ____.
A
100 mR/min at 36 in
B
10 mR/hr at 40 in
C
100 mR/hr at 1 m
D
10 mR/min at tube head
19) If the peak kVp is 110, the average keV energy of the beam would be ____ keV. This is a single phase machine.
A
33-44
B
12-24
C
110
D
66-77
20) The only portion of the anode assembly that is placed outside the vacuum of the envelope is the ____.
A
stator
B
rotor
C
anode
D
focusing cup
*select an answer for all questions
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