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.
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.
At what point in the circuit of the self-rectifying x-ray machine does rectification
a. Between the power source and the prereading voltmeter.
b. Between the prereading voltmeter and the contactor.
d. Within the x-ray tube.
What kind of timer always produces radiographs of exactly the same density?
a. Synchronous timer.
b. Impulse timer.
d. Electronic timer.
Which of the following phenomena is necessary before electrical x-rays can be
a. Electrons of any speed using a high voltage.
Electrons striking any target of porous material.
d. High-speed electrons stopped by a hard, dense target.