Radt 430 Final Exam Questions with 100% Correct Answers

How many alterations in the direction of the current flow occur in 0.10 seconds in a 60 Hz AC current Correct Answer 12 (60Hz= 120 pulse/sec; .10 x 120 = 12) The _______ is the source of radiation in the x-ray tube Correct Answer Actual focal spot High frequency generators Correct 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 Correct Answer outside the glass envelope and outside the rotor Each tube has its own tube rating chart to show_______ Correct Answer maximum exposure times Full-wave rectified, three-pulse units provide an x-ray beam at________pulse(es) per second Correct Answer 360 Thermionic emission at the filament creates a Correct Answer space charge Voltage across the x-ray tube is most constant with Correct Answer high frequency generators The ____ circuit provides electrons for the x-ray tube current Correct Answer filament Radiographing a thin body part using automatic exposure control (AEC) Correct Answer may produce inconsistent images due to AEC timer errors The protective housing controls leakage and scatter radiation through Correct Answer absorption The filament in an x-ray tube is about _____ cm in length Correct Answer 1-2 cm A diode allows electrons to flow from _________ Correct Answer cathode to anode Falling load generators Correct 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 Correct Answer solid state semiconductors As an x-ray tube ages, the inside can become coated with tungsten, which can cause _____ in the tube Correct Answer arcing When compared to battery-powered portable radiographic unit, capacitor discharge mobile units Correct Answer have a tendency to produce leakage exposures after exposures are terminated The rotating anode is turned by a Correct Answer magnetic field The filament is made of Correct Answer tungsten A dual focus tube has two Correct Answer filaments The x-ray intensity is lower on the anode side of the tube because of the Correct Answer heel effect Filament materials are chosen primarily for their Correct Answer high melting points Leakage radiation from the lead-lined housing MUST NOT EXCEED Correct Answer 100mr/hr measured at 1 meter At what point in the x-ray circuit is the rectification circuit located Correct 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 Correct Answer stator The high voltage generator contains the high voltage transformer, the ________, and the __________ Correct Answer filament transformer, rectifier The effective focal spot size is ______ the actual focal spot size Correct Answer smaller than What type of radiation is composed of photons NOT PRODUCED at the actual focal spot Correct Answer off-focus and extra focal Cracking of the anode typically occurs Correct Answer when a cold anode is hit with a high kvp exposure Most mammography units operate with ________ generators Correct Answer high frequency The x-ray generator with the lowest power rating is the ______ imaging system Correct Answer single-phase As the angle of the anode increases and the incident electron beam size remains the same, the effective focal spot size Correct Answer increases