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circuits

QuestionAnswer
line monitor checks the incoming line voltage and current -before line compensator autotransformer
line compensator corrects the incoming voltage and current, compensates for fluctuations -before autotransformer
doubling the V from 110 to 220 allows the system to get the same power with half the current
autotransformer parts and function Parts: self induction. one coil of wire with many taps. kVp meter, coil, and major/minor steps. Receives power first from the outlet. increases voltage to desired 220 V/ varies incoming line voltage using major and minor taps.
kVp meter after the autotransformer, measures voltage and calibrates it to selected kVp
transformer law used to calculate voltage with coil chnages in step up.step down Vs/Vp= Ns/Np N-number of coil turns v-voltage
formula for current and number of coil turns inverse Is/Ip=Np/Ns
step up transformer converts V to kV and amps to milliamps
the timer circuit works in concert with the Rheostat (mA selector)
the timer circuit is before the _. It regulates the step up transformer. in the primary circuit. sets the time of the electron flow
the high voltage section supplies power to the xray tube, not the filaments
the 4 components of the secondary circuit step up transformer, xray tube, mA meter, and rectifier
the mA meter provides an accurate reading of the current delivered
why AC must become DC -electron flow must be one-way for the tube -consistent and powerful xray beam
4 components of the filament circuit mA selector(rheostat), step down transformer, focal spot selector, and filaments
the mA selector works in conjunction with the timer circuit (mA+ time)
the rheostat controls resistance in the filament circuit and thus the current supplied to the filaments
the higher the mA station number, the _ the resistance lower current and resistance are inverse
the filament receives properly modified current from the step down transformer/filament circuit
the filament operates at currents of 3-6 A
electronic timers are useful in angiography. fast and accurate
mechanical timers are used in older dental units. not accurate but cheap.
In the diode symbol, ____ flow is with the arrow, while ____ flow is against the arrow. current :electron
In half=wave rectification, the xray out put is 60 pulses/sec. 2 diodes needed but there are large gaps due to only using half the waveform
full wave rectification output is 120 pulses/sec. 4 diodes takes half the time of half wave, and no large gaps.
more ripple = less efficient rectifier
what generator type is used in portables and mammo high frequency
what generator is used in IR falling load- shortest possible exposure time
highest quality and quantity of xrays are made by circuits with the ____ rippple lowest voltage
Created by: user-1989152
 

 



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