Two x-ray machines are being installed at competing outpatient clinics. While both have four diode diamond rectifiers, the first uses a high voltage transformer that has two vertical coils. The second machine utilizes a star and wye stack transformer to create high voltage. Neither machine features an inverter. What can be said regarding the x-ray beams created by both machines?A The first machine will produce a continuous stream of x-rays as the tube is energized.B The second machine will use more electricity to deliver the same quantity of photons in the beam than the first for a given technique.C The first machine will use more electricity to deliver the same quantity of photons in the beam than the second for a given technique.D The second machine will produce a continuous stream of X-rays with less than 1% voltage ripple during exposure.
The answer is C.Fundamental to answering the question is correctly classifying the two machines according to their output voltage waveforms. The first machine is single phase, full wave rectified power. The conventional two coil transformer indicates a single waveform, while a four-diode rectifier configured in a diamond shape will produce full-wave rectification. There will be two pulses of voltage per cycle, delivering an x-ray beam pulsed at a rate of 120 pulses per second. The second machine, utilizing a star and wye configuration, will produce a three-phase AC wave. All three troughs will be flipped to crests via the same four diode rectifier, and this will produce three-phase rectified power. Voltage ripple will be either 4% or 14%, and the tube will produce a continuous stream of x-rays, as the voltage will never drop to zero. Since machine 2 has a more efficient process, it uses less electric energy, and less exposure time, to deliver an equal quantity of radiation as machine 1. Since neither machine includes an inverter, high frequency generation is not possible (D). The other answer choices are incorrect as per the previous explanation
A: It can be said that both machines will produce a continuous stream of x-rays as the tube is energized.
B: It cannot be concluded that the second machine will use more electricity to deliver the same quantity of photons in the beam than the first for a given technique. The efficiency of the high voltage transformer can vary based on its design and construction, and it is possible that the star and wye stack transformer used in the second machine is more efficient than the vertical coil transformer used in the first machine.
C: It cannot be concluded that the first machine will use more electricity to deliver the same quantity of photons in the beam than the second for a given technique. The efficiency of the high voltage transformer can vary based on its design and construction, and it is possible that the vertical coil transformer used in the first machine is more efficient than the star and wye stack transformer used in the second machine.
D: It cannot be said that the second machine will produce a continuous stream of X-rays with less than 1% voltage ripple during exposure since the question did not provide any information about the voltage ripple produced by either machine.
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