LRA 222 FINAL EXAM NEWEST NEWEST 250 QUESTIONS AND CORRECT DETAILED ANSWERS

LRA 222 FINAL EXAM NEWEST NEWEST 250 QUESTIONS AND CORRECT DETAILED ANSWERS ( ANSWERS)

1 P a g e LRA 222 FINAL EXAM NEWEST 2026-2027 EXAM NEWEST 250 QUESTIONS AND CORRECT DETAILED ANSWERS ( ANSWERS) What is the target of the rotating and usually coated with? - ANSWER- Tungsten What is the most common cause for tube failure? - ANSWERtungsten vaporization High capacity tube rotors revolve at _____ rpm. - ANSWER10,000 How many filaments does a dual focus tube have? - ANSWER2 Is the filament on the positive or negative side of the tube? - ANSWER- Negative What is a filament made of? - ANSWER- Tungsten 2 P a g e What are the components of the anode? - ANSWER- stator and rotor What are the components of the cathode? - ANSWER- filament and focusing cup With the rotating anode the focal spot becomes what? - ANSWER- Focal track Why does the focusing cup keep the electrons together? - ANSWER- Repelling them into a group bc negative repels negative What is the stator made of? - ANSWER- electromagnets What happens to the tube if you prep the rotor, but do not expose an x-ray often? - ANSWER- Damage Where is the main power switch located? - ANSWER- primary circuit Where is the primary side of the high voltage transformer found? - ANSWER- primary circuit 3 P a g e Where is the timer circuit found? - ANSWER- primary circuit Where is the step down transformer found? - ANSWERfilament circuit What is the purpose of a line compensator? - ANSWERMeasures and stabilizes voltage What is the purpose of the rectifier? - ANSWER- Convert AC to DC What is the purpose of the filament circuit? - ANSWER- Boils electrons/ thermionic emission What is the primary purpose of a step down transformer? - ANSWER- Coverts high voltage to low voltage To produce x-rays, does a cathode require positive or negative charge? - ANSWER- Negative What is tube current? - ANSWER- Rate of flow of electrons 4 P a g e AEC - ANSWER- automatic exposure control What does AEC control? - ANSWER- the quantity of radiation reaching the IR When it comes to the circuit, where is the x-ray tube located? - ANSWER- Secondary circuit Who developed the electromagnetic theory in 1800? - ANSWER- James Clark Maxwell Does electromagnetic radiation have mass? - ANSWER- No What effect does mAs have on brightness? - ANSWER- no effect What happens with digital imaging when the mAs setting is too high? - ANSWER- Over exposed patient What is the result of using excessive kVp with a digital IR? - ANSWER- Increase scatter