The purpose of an x-ray tube filament found in an x-ray circuit is to___.
Allow the current to flow in one direction only.
B. Increase or decrease voltage.
Create thermionic emission.
D. Measure tube current.
查看答案
The reasons to have two filaments within one tube are followings except____.
A small filament for better geometric resolution.
B. Two filaments for robustness of the tube.
C. A large filament for higher output.
D. To acquire desirable image quality for various subjects.
The followings are main functions of X-ray tube except_____.
A. Conversion of electric energy to X-ray.
B. Conversion of electric energy to heat.
C. Fixation of collimator.
D. Connection for high-tension cables.
Tungsten will melt at what degree?
A. 3000°C
B. 3000°F
C. 3400°F
D. 3400°C
The voltage and waveform applied to the X-ray tube by a high-voltage transformer primarily determines the _____.
A. quantity of radiation
B. duration of exposure
C. penetrating ability
D. X-ray beam divergence
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