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Generator 156

Part 2

QuestionAnswer
The higher mA station number, the ________ the resistance Lower
_________ Modified power is required to heat tube filament Modified Power
The Step-Down Transformer _______ voltage and adjusts amperage Decreases
Primary Coil of Step-Down Transformer = Approximately 150 V & 1 A
Secondary Coil of Step-Down Transformer = 12 volts and 5-8 A
________ Determines the temperature of the filament and the number of electrons produced The Step-Down Transformer
________ correspond to the dual sized filaments Small and Large focal spots
Filaments are Thin tungsten wires located on the _______ side of the x-ray tube Cathode
_________ results when filaments are heated Thermionic Emission
_________ Receive properly modified current from the step-down transformer Filaments
Filaments operate at currents of 3 to 6 A
The ______ is located in the low voltage section Timer Circuit
The Timer Circuit controls exposure time by Terminating Exposure
Mechanical Timers- A preset exposure time is set by turning a knob that winds a spring. When the exposure button is depressed, the spring is released
Synchronous Timers- Driven by a synchronous motor which operates at 60 revolutions per second
Electronic Timers- The most expensive, most complicated and most accurate of all the types of x-ray timers
mAs Timers- special kind of electronic timer • Provides the highest safe mA for the shortest exposure time
Automatic Exposure Control- Terminates exposure when required amount of radiation has reached the image receptor
Automatic Exposure Control Determines the ______ of radiation reaching IR Quantity
What timers are useful in Angiography? Electronic Timers
What timers are used mostly in older dental units? Mechanical Timers
Rectification occurs after _______ in an x-ray circuit The step-up transformer
Rectification occurs before ______ in an x-ray circuit The x-ray tube
AC is changed to______ in a Rectification Circuit Pulsating Direct Current (DC)
Electric Current is _____ the direction of the arrow of a diode symbol With
Electron Flow is _____ the direction of the arrow of a diode symbol Against
Ripple- Decrease in voltage because the potential drops to zero with every change in direction
Ripple results in a Pulsating X-Ray Beam
Generators & Rectifiers- Are used to manipulate the waveform in order to reduce ripple
Created by: user-2016295
 

 



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