Physic 2 Unit 1 HW
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| Which of the following principles of rectification produces the maximum efficiencyof x-ray production? | High frequency
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| To generate three-phase, six pulse power, at least how many rectifiers are necessary? | 6
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| A semiconductor rectifier: | Is a solid-state device
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| 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
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| The voltage ripple associated with various x-rays generators is | 100% for self-rectification
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| A rectifier Converts | Converts AC to DC
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| In a circuit that contains a single rectifier: | Electron flows in one direction but not in the other
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| If 60Hz AC power if full-wave rectified, output voltage consists | 120 pulses per second
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| The current from a common household wall receptacle in the United States is | 60HZ AC
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| Thermionic emission refers to | Electron emission from a heated source
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| Which of the following is a symbol for a diode | ------>1--------
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| The main advantage of full wave rectification over the half-wave rectification is | A greater number of x-rays per cycle
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| How many overlapping pulses are generated in 1s for threes-phase , six pulse power? | 360
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| Full wave length rectified | 100%
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| High frequency | 1%
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| Three phase, six pulse | 13%
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| Three phase, twelve pulse | 4%
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| Self-rectified | 100%
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| Power to the primary side of the high-voltage transformer comes from the | Secondary side of the autotransformer
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| The output voltage from the autotransformer | proportional to the turns ratio
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| The autotransformer converts | Electric energy to electric energy
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| The autotransformer operates on the principle of | Faradays law
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| The principle purpose of the high voltage transformer is to do which of the following? | Increase voltage
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| 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
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| The autotransformer has only one | Coil
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| The principle purpose of the autotransformer is to | Adjust voltage
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| Which of the following is directly connected to the autotransformer? | kVp meter
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| Taps on the windings of an autotranformer are used to select which of the following? | line compensation
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| The autotransformer can be used to do which of the following? | Increase kVp
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| In the design of an autotransformer | A single coil serves as both the primary and the secondary coil
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| Selection of kVp | Requires that constate voltage be supplied to the autotransformer
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| Line compensation | is required to stabilize voltage
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| Which of the following is uded to determine the voltage before exposure? | An autotransformer
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| The filament transformer | Increases current
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| The filament transformer is usually | A step-down transformer
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| The filament circuit | Begins at the autotransformer and ends at the filament
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| The unit mAs | could be expressed in coulombs
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| An exposure technique of 100 mAs at 100 ms compared with 50 mA at 50 ms results in | Four times the number of electrons
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| The control of the focal spot size depends on | The filament that is energized
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| The meter that monitors x-ray tube current is | physically located on the control console
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| x-ray tube current is usually measured in which of the following | milliamperes (mA)
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| The filament transformer is designed | with a turn ratio less than 1
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| Which of the following would be correct to use for expressing x-ray tube current? | coulombs/second
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| The design of fixed mA stations requires the use of which of the following | precision resistors
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| mA is a unit of electric current, and mAs is a unit of | Electric charge
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| 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
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| A radiographic technique calls for a 400 mA, 1/20 s exposure. What is the mAs? | 20 mAs
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| If an x-ray imaging system is operated at 600mA, 50ms, the total mAs will be which of the following? | 30mAs
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| 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
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| operation at 300mA for 1/20 s is equivalent to operation at 900 mA for | 17ms
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| The control of exposure time always | on the primary side of the high-voltage transformers
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| The exposure timer on a three phase radiographic imaging system will | be electric
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| An automatic exposure control(AEC)device: | can use an ionization chamber between the patient and the image recpyor
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| With an automatic exposure control (AEC) devic: | A back up timer is required
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| The shortest exposure possible eith single phase equipment is 1/120 s. How many milliseconds is that? | 8 ms
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| Mammography sometimes requires exposures as long as 1.5s.This is equivalent to which of the following? | 1500 ms
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| The shortest exposure possible with a three phase equipment is 1ms. What fraction of a second is that? | 1/1000
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| There are 30 video frames each seconds for a fluoroscopic CRT dynamic image. What is the length for each frame? | 33ms
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| The human eye cannot visualize faster than approximately five veiws each second. what is the intergration time of the human eye? | 200ms
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| A radiographic technique calls for 86kVp/200mAs using the 800 mA station. What is the exposure time? | 250ms
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| Which of the following is contained in a typical high voltage generator? | diode rectifier
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| A change in the voltage waveform from the primary side to the secodary side of the high voltage transformer produces | Amplitude
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| In half-wave rectification, each inverse half-cycle in the primary circuit corresponds to how many voltage pulses across the x-ray tube? | None
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| Which of the following is higher for a single-phase high voltage generator than for a three-phase high voltage generator? | Voltage ripple
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| Which of the following is a disadvantage of three phase power compared with single-phase power? | High capital cost
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| The disadvantage of a self-rectified cicuit is | its limited exposure time
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| An exposure of 1/10 s | Produces twice as much radiation if full-wave rectified than if half wave rectified
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| Full wave rectification | requires at least four rectifiers
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| A rectifier | can be a semiconductor
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| Concerning the transformer used in the x-ray circuit | The high voltage transformer is a step up device
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| Which of the following is an advantage of three phase power over single phase power | increased x-ray intensity per mAs
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| Oil is used in the high voltage section of an x-ray imaging system for which of the following functions | Electrical insulation
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| Which power supply should provide the highest quality x-ray beam? | high frequency
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| Full wave rectified power | 100%
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| half wave rectified power | 100%
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| high frequency power | 1%
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| Three phase six pulse power | 13%
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| Three phase 12 pulse power | 4%
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