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RAD 255 test 3

QuestionAnswer
How many rectifiers are needed in a half wave radiographic unit ? 1 or 2 rectifiers
How many rectifiers are needed in a full wave radiographic unit ? at least 4 rectifiers
How many rectifiers are needed in a three phase radiographic unit ? 6 to 12 rectifiers
What are the advantages of the 3-phase equipment? shorter exposure times, reduced motion, less heat produced, higher beam penetrability
What are the disadvantages of the 3-phase equipment? more expensive, more complicated circuit so higher maintenance cost
What are the single phase half- wave rectification voltage ripple %? 100%
What are the single phase full- wave rectification voltage ripple %? 100%
What are the 3-phase /6-pulse rectification voltage ripple %? 14%
What are the 3-phase /12-pulse rectification voltage ripple %? 4%
What are the 3-phase /12-pulse with capacitor rectification voltage ripple %? 0%
What is the voltage ripple % for high frequency equipment? 1% or less
What are the single phase half- wave rectification pulses/cycle and pulses/ second? 1 per cycle, 60 per second
What are the single phase full- wave rectification pulses/cycle and pulses/ second? 2 per cycle, 120 per second
What are the 3-phase /6-pulse pulses/cycle and pulses/ second? 6 per cycle, 360 per second
What are the 3-phase /12-pulse pulses/cycle and pulses/ second? 12 per cycle, 720 per second
What are the 3-phase /12-pulse with capacitor pulses/cycle and pulses/ second? 12 per cycle, 720 per second
What is a capacitor? stores an electric charge
What is half wave rectification? allows current to flow only during positive phase of AC waveform
What is Full wave rectification? converts the inverse portion of the AC waveform into the positive phase so that the entire portion of the current is utilized
What is self rectification ? What type of equipment might use it ? In old portables or dental units, xray tube itself served as the rectifier, no rectifier devices were used in this circuit
what is voltage ripple ? used to describe the amount of fluctuation or rise and fall of the voltage from the maximum or peak voltage
Is single phase xray beam pulsed or constant? pulsed
How many wires supply on a single phase xray unit? electrical supply delivered by one single power line
Is 3 phase xray beam pulsed or constant? constant
How many wires supply on a 3 phase xray unit? electrical supply delivered by three separate power lines
What is a symptom that the rectifier could be faulty? radiation output can be decreased, typically will be reduced by 50% less than normal
How can a single phase faulty rectifier be tested ? manual spinning top test, a milliammeter will register or indicate 1/2 normal output
How can a 3 phase faulty rectifier be tested ? electronic device with an oscilloscope will produce a visual representation of voltage output waveform
What type of configuration is on the high voltage transformer in 3 phase equipment ? delta winding
What is the single phase kilowatt rating formula ? kv x mA x .7 --------------- 1000
What are the two basic types of rectifiers ? valve tube or kinetron and solid state
What are the advantages of the solid- state rectifier? smaller size, longer life expectancy, can withstand much higher temperature, greater resistance to inverse voltage
Where is the capacitor located in a circuitry? located between rectifier circuit and xray tube
what are the 3 primary switches? -electromechanical (slow) -electronic "thyratrons" (fast) -silicon controlled rectifier SCR "thyristors" (fast)
What are the 3 secondary switches? -grid controlled xray tube -constant potential generator -triode vacuum tube
Where are the primary switches located ? located on the PRIMARY or LOW VOLTAGE side of the xray circuit or step up transformer
Where are the secondary switches located? located on the SECONDARY or HIGH VOLTAGE side of the xray circuit or step up transformer
What is the synchronous timer? operates on synchronous motor rotating at a fixed speed
What is the electronic timer? advanced electronic design, controlled by a microprocessor
What is the mAs timer? unit chooses highest mA station and shortest exposure time
How do you convert milliseconds to seconds? divide by 1000
How do you convert seconds to milliseconds? multiply by 1000
What is the function of a switch? "the worker" responds to the timer by opening and closing the electrical circuit allowing current to pass through the xray tube to accomplish the exposure
What is the slowest switch? electromechanical
What is the fastest switch? electronic timer
What type of switch can only open and close at the end of an AC cycle or at the end of a pulse ? synchronous
Created by: madyep
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