how many alterations in the direction of the current flow occur in 0.10 seconds in a 60 Hz AC current - Answer-12 (60Hz= 120 pulse/sec; .10 x 120 = 12)
the _______ is the source of radiation in the x-ray tube - Answer-Actual focal spot
High frequency generators - Answer-1) use inventors to in...
RADT 430 Final Exam Questions with
Latest Update
how many alterations in the direction of the current flow occur in 0.10 seconds in a 60
Hz AC current - Answer-12 (60Hz= 120 pulse/sec; .10 x 120 = 12)
the _______ is the source of radiation in the x-ray tube - Answer-Actual focal spot
High frequency generators - Answer-1) use inventors to increase pulse frequency
2) produce similar outputs to three-phase with a single phase source
3) achieve peak kVp faster than single or three-phase generators
where is the stator of the anode induction motor located - Answer-outside the glass
envelope and outside the rotor
each tube has its own tube rating chart to show_______ - Answer-maximum exposure
times
full-wave rectified, three-pulse units provide an x-ray beam at________pulse(es) per
second - Answer-360
thermionic emission at the filament creates a - Answer-space charge
voltage across the x-ray tube is most constant with - Answer-high frequency generators
the ____ circuit provides electrons for the x-ray tube current - Answer-filament
radiographing a thin body part using automatic exposure control (AEC) - Answer-may
produce inconsistent images due to AEC timer errors
the protective housing controls leakage and scatter radiation through - Answer-
absorption
the filament in an x-ray tube is about _____ cm in length - Answer-1-2 cm
a diode allows electrons to flow from _________ - Answer-cathode to anode
falling load generators - Answer-1) permit higher mA exposures for short exposure
times
2) permit the mA to fall as exposure time increases
3) are designed to use the highest allowable mA
,in modern imaging systems, the components for rectification are - Answer-solid state
semiconductors
as an x-ray tube ages, the inside can become coated with tungsten, which can cause
_____ in the tube - Answer-arcing
when compared to battery-powered portable radiographic unit, capacitor discharge
mobile units - Answer-have a tendency to produce leakage exposures after exposures
are terminated
the rotating anode is turned by a - Answer-magnetic field
the filament is made of - Answer-tungsten
a dual focus tube has two - Answer-filaments
the x-ray intensity is lower on the anode side of the tube because of the - Answer-heel
effect
filament materials are chosen primarily for their - Answer-high melting points
leakage radiation from the lead-lined housing MUST NOT EXCEED - Answer-100mR/hr
measured at 1 meter
at what point in the x-ray circuit is the rectification circuit located - Answer-between the
step-up transformer and the X-ray tube
the only portion of the anode assembly placed out side the vacuum of the envelope is
the - Answer-stator
the high voltage generator contains the high voltage transformer, the ________, and the
__________ - Answer-filament transformer, rectifier
the effective focal spot size is ______ the actual focal spot size - Answer-smaller than
what type of radiation is composed of photons NOT PRODUCED at the actual focal
spot - Answer-off-focus and extra focal
cracking of the anode typically occurs - Answer-when a cold anode is hit with a high kVp
exposure
most mammography units operate with ________ generators - Answer-high frequency
the x-ray generator with the lowest power rating is the ______ imaging system -
Answer-single-phase
, as the angle of the anode increases and the incident electron beam size remains the
same, the effective focal spot size - Answer-increases
the physical area of a rotating anode focal track, affected by the cathode electron beam,
is the - Answer-actual focal spot
all of the following are x-ray tube support systems EXCEPT - Answer-fluoroscopic tower
(image intensifier)
as more and more electrons build up in the area of the filament, their negative charges
oppose the emission of additional electrons. this phenomenon is known as - Answer-
space charge effect
the automatic exposure control (AEC) terminates the exposure when - Answer-sufficient
radiation reaches the image receptor
the most accurate type of timer is the ________ timer - Answer-electronic
the actual focal spot is controlled by the - Answer-length of the filament
nearly all types of x-ray equipment operate from an incoming line of - Answer-210 V
the anode side of the tube should be directed toward the ______ part of the patient -
Answer-thinner
the focusing cup as a/an __________ charge - Answer-negative
the difference in the waveform between the primary and secondary sides of the high
voltage transformer is - Answer-amplitude
a diode allows electrons to flow from - Answer-cathode to anode
the operating console contains circuits that are - Answer-low voltage only
a step-down transformer is located in the __________ circuit - Answer-filament
the autotransformer has ________ winding(s) - Answer-one
the step-up transformer increases voltage _________ times - Answer-500-1000
the _______ circuit provides electrons for the x-ray tube current - Answer-filament
(true/false) as conversion efficiency increases the radiation dose to the patient
increases - Answer-false
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