# RT 110 physics test

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1. What is the wave equation?
Velocity = frequency x wavelength
2. If frequency increases, then wavelength _______
decreases
3. If frequency decreases, then wavelength _________
increases
4. What is defined as the number of wave forms per second?
Frequency
5. Frequency is a representation of _______
energy
6. X-ray photons are about __ cycles per second
10^19
7. As beam energy is increased, frequency ______
increases
8. Beam energy is determined by what?
kVp
9. The higher the kVp, the _____ the ________ (there are 4)
• the higher the photon frequency
• the higher the beam quality
• the harder the beam
• the higher the penetrability of the beam
10. Higher energy photons act like what?
• particles
• note: if they hit something, they do damage
11. Low energy photons act like what?
• waves
• note: they just bump into things. takes a lot to do damage
12. An electric current is induced in a circuit if part of the circuit is in a changing magnetic field. A magnetic field can be generated by alternating magnetic fields. This is known as what?
13. Transformers work with __ current through the application of Faraday's Law.
AC-alternating current
14. The goal of a step-down transformer is?
• To decrease the incoming voltage and increase current.
• ***They work on the principle of mutual induction
• ***Allows for thermionic emission to occur at the filament
• ***Ultimately, provides the electrons necessary for x-ray production.
15. Which side of the step-down transformer has fewer windings?
Secondary side
16. The goal of a step-up transformer is?
To increase the voltage
17. Which side of the step-up transformer has more wires?
• Secondary side
• ***therefore a higher voltage is produced
18. Which side of the step-up transformer does the voltage come in?
Primary side
19. What are 2 other names for the step-up transformer?
• high-voltage
• high-tension
20. What has only one winding and works on the principle of self-induction?
autotransformer
21. What are the 3 types of transformers?
• Closed-core transformer
• Autotransformer (single)
• Shell-type transformer
22. What gets transformed in a transformer?
Voltage and current
23. What are the 3 sections of the x-ray circuit
• Operating (control) console
• High voltage generator
• X-ray tube
24. What addresses the issue of the divergent beam?
• Inverse Square Law
• ***As the beam travels it diverges or spreads out. The further it travels the more spread out it becomes, however, the intensity will be diminished
25. What are conditions that are necessary for x-ray production?
• High voltage-in the kilovolt range
• Electrons-a supply of electrons and a need to stop the electrons suddenly
26. How do transformers work?
• The can only work using AC current
• On the principle of induction - mutual and self
• The basic premise is that the AC current "induces" alternating magnetic fields in loop (coils) of wire
• These alternating magnetic fields are distributed throughout the core of the transformer
27. What is the conservation of energy?
When voltage is increased, the current decreases
28. Which side of the step-down transformer has more coils?
• The primary side
• ***This results in a decrease in voltage through the transformer
29. What consists of the operating (control) console?
• Line voltage compensator/monitor
• Autotransformer
• kVp selector
• mA selector
• Timer
30. What is the purpose of the line voltage compensator?
To maintain a constant voltage to the system. In the modern system this is done automatically
31. The autotransformer works on what principle? Is it a step- up or step-down transformer or both?
• The autotransformer works on the principle of self-induction. It has a single core and is responsible for varying the voltage.
• Because of its ability to adjust voltage, the autotransformer can be either a step-up or step-down transformer.
32. Where is the kVp adjusted at?
The autotransformer
33. Why is the kVp meter considered pre-reading?
• •The kVp meter is considered pre-reading because it is not actually measuring kVp but measuring voltage off the autotransformer.
• ***Remember, the autotransformer is used to adjust voltage.
34. What types of electronic timers are out there as of today?
• mAs
• Phototiming (AEC)
• Regular electronic
35. What does the mA selector do?
• Allows for adjust of the filament voltage
• ***Precision resistors
• ***Choke coil
36. What is another name for the step-down transformer?
Filament transformer
37. What is the purpose of the retifier?
To allow electrons to flow in only one direction
38. How many retifiers are required to fully convert AC to DC?
4 retifiers
39. Rectifiers convert __ to __ current
AC to DC current
40. What are the types of circuits?
• Single phase
• Three phase
• Medium and high frequency
• Capacitor discharge
41. What consists of the single phase?
• Full wave
• Half wave
42. What consists of the three phase?
• 6 pulse
• 12 pulse
43. What do the three phase units use for transformers?
Delta and 'wye'
44. In a three phase transformer, the 6 pulse uses what and how many transformers?
2 'wye' and 1 delta
45. In a three phase transformer, the 12 pulse uses what and how many transformers?
2 delta and 1 'wye'
46. Three phase transformers require how many rectifiers?
12 retifiers
47. What are the advantages of three phase?
• Higher beam quantity and quality
• Higher mA stations are also possible
48. Why higher quantity and quality for three phase?
• Because the voltage ripple is less
• ***Basically when the tube is energized it stays energized.
49. The turns ratio for the step-up transformer is:
500:1 or 1000:1

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 Author: fongpay03 ID: 113280 Filename: RT 110 physics test Updated: 2011-11-18 06:10:30 Tags: RT 110 physics test Folders: Description: RT 110 physics test Show Answers:

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