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Imaging Science 2
X-ray tubes, transformers, generators, timers and switching
| Term | Definition |
|---|---|
| What is the purpose of a transformer? | To increase or decrease the voltage input without loss of energy |
| Transformers transfer electrical energy from one circuit to another by___________ | Mutual Electromagnetic Induction |
| Why is a transformer essential? | To transfer the energy from the mains power into usable energy to produce x-rays |
| A high tension transformer produces a _____ of high voltage for ________________ | 1. current 2. Production of x-rays |
| A large potential difference between the cathode and anode causes what in a high tension transformer? | Accelerated electrons at the filament to high velocities |
| A high tension consists of a _______ and _______ circuit | 1. Auto transformer 2. Step-up transformer |
| What is the purpose of an auto transformer? | To allow for fluctuations in the mains input voltage before the current is fed to the HT transformer |
| What does the pre-reading voltmeter do? | Measures incoming voltage and allows for fluctuations in the national grid |
| Which transformer ensures that the incoming line voltage remains constant? | Auto transformer |
| What is the purpose of a step -up transformer? | Permits the supply of a suitably increased current to the cathode filament |
| Where is the kV meter placed in a step-up transformer? | Across the primary circuit |
| What does the kV meter measure? | Incoming voltage but calibrated to read across the x-ray tube voltage |
| Which is more effective, a three-phase or single-phase generator? | Three-phase |
| What is the purpose of rectification? | To convert an AC current to DC current |
| What is the optimal wave form after rectification? | A waveform with short and narrow-spaced peaks |
| What does an x-ray generator do? | Provides power to the x-ray tube |
| In a transformer, the volts per turn is _____ everywhere in the transformer | Constant |
| The total voltage of the secondary winding is the product of the ______ volts per turn | Primary |
| Since volts-per-turn is constant, the total voltage on the secondary must be _______ | Secondary Voltage=Primary Voltage X Turns Ratio |
| Turns Ratio= | Secondary Turns/Primary Turns |
Created by:
sarah.scheuber
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