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Physic 2 Unit 1 HW

QuestionAnswer
Which of the following principles of rectification produces the maximum efficiencyof x-ray production? High frequency
To generate three-phase, six pulse power, at least how many rectifiers are necessary? 6
A semiconductor rectifier: Is a solid-state device
If a single rectifier is inserted into a circuit that conducts 60 Hz AC so that is suppresses the positive portion of the waveform, then the output waveform will comtain: 60 negative pulses per second
The voltage ripple associated with various x-rays generators is 100% for self-rectification
A rectifier Converts Converts AC to DC
In a circuit that contains a single rectifier: Electron flows in one direction but not in the other
If 60Hz AC power if full-wave rectified, output voltage consists 120 pulses per second
The current from a common household wall receptacle in the United States is 60HZ AC
Thermionic emission refers to Electron emission from a heated source
Which of the following is a symbol for a diode ------>1--------
The main advantage of full wave rectification over the half-wave rectification is A greater number of x-rays per cycle
How many overlapping pulses are generated in 1s for threes-phase , six pulse power? 360
Full wave length rectified 100%
High frequency 1%
Three phase, six pulse 13%
Three phase, twelve pulse 4%
Self-rectified 100%
Power to the primary side of the high-voltage transformer comes from the Secondary side of the autotransformer
The output voltage from the autotransformer proportional to the turns ratio
The autotransformer converts Electric energy to electric energy
The autotransformer operates on the principle of Faradays law
The principle purpose of the high voltage transformer is to do which of the following? Increase voltage
The voltage supplied to an x-ray imaging system is 220V. The voltage used by the x-ray tube is produced by which of the following? High-voltage transformer
The autotransformer has only one Coil
The principle purpose of the autotransformer is to Adjust voltage
Which of the following is directly connected to the autotransformer? kVp meter
Taps on the windings of an autotranformer are used to select which of the following? line compensation
The autotransformer can be used to do which of the following? Increase kVp
In the design of an autotransformer A single coil serves as both the primary and the secondary coil
Selection of kVp Requires that constate voltage be supplied to the autotransformer
Line compensation is required to stabilize voltage
Which of the following is uded to determine the voltage before exposure? An autotransformer
The filament transformer Increases current
The filament transformer is usually A step-down transformer
The filament circuit Begins at the autotransformer and ends at the filament
The unit mAs could be expressed in coulombs
An exposure technique of 100 mAs at 100 ms compared with 50 mA at 50 ms results in Four times the number of electrons
The control of the focal spot size depends on The filament that is energized
The meter that monitors x-ray tube current is physically located on the control console
x-ray tube current is usually measured in which of the following milliamperes (mA)
The filament transformer is designed with a turn ratio less than 1
Which of the following would be correct to use for expressing x-ray tube current? coulombs/second
The design of fixed mA stations requires the use of which of the following precision resistors
mA is a unit of electric current, and mAs is a unit of Electric charge
A radiographic technique calls for a 50ms exposure, but the exposure control has only fractional notation. Which of the following should be selected? 1/20 s
A radiographic technique calls for a 400 mA, 1/20 s exposure. What is the mAs? 20 mAs
If an x-ray imaging system is operated at 600mA, 50ms, the total mAs will be which of the following? 30mAs
A radiographic technique of 100mA at 1/4 s has been used. If one changes to 500mA station, the appropriate exposure time for the same mAs is which of the following? 1/20s
operation at 300mA for 1/20 s is equivalent to operation at 900 mA for 17ms
The control of exposure time always on the primary side of the high-voltage transformers
The exposure timer on a three phase radiographic imaging system will be electric
An automatic exposure control(AEC)device: can use an ionization chamber between the patient and the image recpyor
With an automatic exposure control (AEC) devic: A back up timer is required
The shortest exposure possible eith single phase equipment is 1/120 s. How many milliseconds is that? 8 ms
Mammography sometimes requires exposures as long as 1.5s.This is equivalent to which of the following? 1500 ms
The shortest exposure possible with a three phase equipment is 1ms. What fraction of a second is that? 1/1000
There are 30 video frames each seconds for a fluoroscopic CRT dynamic image. What is the length for each frame? 33ms
The human eye cannot visualize faster than approximately five veiws each second. what is the intergration time of the human eye? 200ms
A radiographic technique calls for 86kVp/200mAs using the 800 mA station. What is the exposure time? 250ms
Which of the following is contained in a typical high voltage generator? diode rectifier
A change in the voltage waveform from the primary side to the secodary side of the high voltage transformer produces Amplitude
In half-wave rectification, each inverse half-cycle in the primary circuit corresponds to how many voltage pulses across the x-ray tube? None
Which of the following is higher for a single-phase high voltage generator than for a three-phase high voltage generator? Voltage ripple
Which of the following is a disadvantage of three phase power compared with single-phase power? High capital cost
The disadvantage of a self-rectified cicuit is its limited exposure time
An exposure of 1/10 s Produces twice as much radiation if full-wave rectified than if half wave rectified
Full wave rectification requires at least four rectifiers
A rectifier can be a semiconductor
Concerning the transformer used in the x-ray circuit The high voltage transformer is a step up device
Which of the following is an advantage of three phase power over single phase power increased x-ray intensity per mAs
Oil is used in the high voltage section of an x-ray imaging system for which of the following functions Electrical insulation
Which power supply should provide the highest quality x-ray beam? high frequency
Full wave rectified power 100%
half wave rectified power 100%
high frequency power 1%
Three phase six pulse power 13%
Three phase 12 pulse power 4%
Created by: atesta0824
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