8.
When a two-valve rectification system is used, the current flows from the power
source through which of the following sequences of tubes?
a. First valve tube, the x-ray tube, the other valve tube, and back to the source.
b. Two valve tubes in a series, the x-ray tube, and back to the source.
c.
X-ray tube, the two valve tubes in series, then back to the source.
d. X-ray tube, the two valve tubes in parallel, then back to the source.
9.
At what point in the circuit of the self-rectifying x-ray machine does rectification
occur?
a. Between the power source and the prereading voltmeter.
b. Between the prereading voltmeter and the contactor.
c.
Between the timer and the step-down transformer.
d. Within the x-ray tube.
10.
What kind of timer always produces radiographs of exactly the same density?
a. Synchronous timer.
b. Impulse timer.
c.
Photoelectric timer.
d. Electronic timer.
11.
Which of the following phenomena is necessary before electrical x-rays can be
produced?
a. Electrons of any speed using a high voltage.
b. Wavelengths with low frequency.
c.
Electrons striking any target of porous material.
d. High-speed electrons stopped by a hard, dense target.
MD0950
3-28
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