Part II

• fluctuations in the voltage waveforms

  voltage ripple
• waveform decrease in voltage because the potentional voltage drops to zero with every change in direction
• What is used to manupulate the AC waveform in order to reduce ripple ?

  generators and rectifiers
• What are the 3 main generators that we used ?

  single-phase , three-phase , and high-frequency
• What are the 5 generators ?

  single-phase , three-phase, high-frequency , capacitor discharge, falling load
• Which type of generator generates on ac waveform ?

  single-phase
• Which generator has 100 % voltage ripple ?

  single phase
• Which generator produces x-rays that have less penetrability ?

  single- phase
• Which generators uses AC that is slightly out of step with and superimposed on each other ?

  Three-phase generator
• Which generator maintains near constant voltage ; voltage does not drop to zero ?

  Three-phase generator
• Which generator produces x-rays that have more penetrability than a single phase generator ?

  three-phase generator
• Which generator has an advantage that require 10 kVp reduction to produce the same receptor exposure as an image taken using single phase power ?

  Three-phase generator
• What is an advantage of a three-phase generator ?

  less ripple
• 
  

  Which generator has 6 diodes ? Three phase 6 pulse
• Which generator has an x-ray output 360 pulses per second ?

  3-phase 6 pulse
• Which generator has 12 diodes ?

  3-phase 12 pulse
• Which generator has a voltage produced is within 90% - 96 % of kvp setting slected on the control panel ?

  3 phase 12 pulse
• Which generator has 720 pulses per second ?

  3 phase 12 pulse
• highest quality and highest quantity of x-rays are produced by x-rays systems with lowest voltage ripple
• Which circuit supplies voltage to the anode and cathode ?

  secondary circuit
• What component and circuit supplies current to the x-ray tube filaments ?

  step-down transformer and low-voltage section
• What is the voltage and hertz typically supplied to the x-ray imaging system ?

  60 Hz and 110 V
• What is the voltage of the x-ray imaging system needs ?

  220 V
• Which transformer raises incoming line voltage to kV range to produce x-rays ?

  step-up trnasoformer
• Which transformer provides the current that heats up the filament ?

  step-down transformer
• What component of the generator adjusts the incoming voltage and corrects any functions ?

  line compensator
• What component adjust the current by varying resistance ?

  ma selector
• What type of timer is the most complex, and is used in interventional radiology ?

  electronic timer
• What type of timer terminates exposure when desired mAs is reached ?

  mAs
• What type of timer measures exposures times produce din 60 second intervals ?

  sychronous timer
• What type of timer automatically stops the exposure reaches the IR ?

  AEC ( Automatic exposure timer )
• What type of timer is set to 1.5x or 150% the expected exposure time ?

  back up timer
• What component repsonds to the kVp meter ?

  kVp selector
• What component that responds to the mA meter ?

  mA selector and step-down transformer
• What type of current is needed by the transformers & the x-ray tube in the x-ray imaging circuit ?

  AC
• What is the percentage of voltage ripple during a single-phase half wave ?

  100 %
• What is the percentage of voltage ripple for a single-phase full ?

  100 %
• What is the voltage ripple for a 3-phase, 6 pulse ?

  13%-14%
• What is the voltage ripple for a 3-phase 12 pulse ?

  3%-4%
• What types of x-ray imaging system that uses high-frequency generators ?

  mammography and CT