pg. 1
LRA 222 FINAL EXAM 2024 REVIEW
TEST BANK WITH 200 REAL EXAM
QUESTIONS AND CORRECT VERIFIED
ANSWERS (100% CORRECT) LRA 222
FINAL EXAM 2024/2025 (NEW!!)
the external structure of the x-ray tube includes the - ANSWER-support structure, protective housing, glass envelope
localized pitting on the anode target can occur from a - ANSWER-single excessive exposure
the automatic exposure control (AEC) - ANSWER-terminates the exposure when sufficient radiation reaches the image receptor
the x-ray generator with the lowest power rating is the - ANSWER-single-phase imaging system
the autotransformer has - ANSWER-one winding
First component in the x-ray circuit is the - ANSWER-autotransformer
a step-down transformer is located in the - ANSWER-filament circuit
voltage across the x-ray tube is the most constant with - ANSWER-high frequency generators 1 / 3
pg. 2
filament circuit provides electrons for the - ANSWER-x-ray tube current
The operating console contains circuits that are - ANSWER-low voltage only
a single-wave rectification - ANSWER-has 100% ripple
With half-wave rectification, the current flows through the x-ray tube during the _____ part of the cycle. - ANSWER-positive part of the cycle
Full wave rectification three phase units provide an x-ray beam at - ANSWER-360 pulses per second
three main parts of the x-ray imaging system - ANSWER-x-ray tube, operating console, high voltage generator
step up transformer increases voltage - ANSWER-500-1000 times
x-ray beam generated by the circuit with the lowest voltage ripple has the - ANSWER-the highest quantity and quality
the industry standard for calculating high voltage generator power is to use the - ANSWER-maximum tube current at 100 kVp and 100ms
mammography units operate with - ANSWER-high frequency generators
the principal disadvantage of three-phase equipment is - ANSWER-cost 2 / 3
pg. 3
the high voltage generator contains - ANSWER-high voltage transformer, filament transformer, and rectifiers
thermionic emission at the filament determines - ANSWER-milliamperage across the x-ray tube during an exposure
a diode allows electrons to flow from - ANSWER-cathode to anode
the mAs timer is usually set to give the - ANSWER-highest mA at the shortest amount of time
the difference in the waveform between the primary and secondary sides of the high voltage transformer is - ANSWER-amplitude
Variations in power distribution to the x-ray machine are corrected by the - ANSWER-line voltage compensator
the most accurate type of timer is the - ANSWER-electronic timer
In modern imaging systems, the components for rectification are _____. - ANSWER-solid state state semiconductors
when electrons bombard the target 99% of energy is converted to - ANSWER-heat
the induction motor works by - ANSWER-electromagnetic induction
- / 3