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.
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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
A thin metallic sheet (brass, copper, aluminum, etc) placed at the source to reduce effects of softer radiation is known as _____.
A. an intensifying screen
B. a filter
C. beam collimator
D. a focusing cup
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