Ch. 6 - X-Ray Equipment

At what point in the x-ray circuit is the rectification circuit located?

a. between the semiconductors and the valve tubes

b. between the step-down transformer and the rheostat

c. between the step-up transformer and the x-ray tube

d. between the thermionic diode tubes and the x-ray machines

c. between the step-up transformer and the x-ray tube

Where is the stator of the anode induction motor located?

a. inside the glass envelope but outside the rotor

b. outside the glass envelope and outside the rotor

c. inside the glass envelope and inside the rotor

d. outside the glass envelope but inside the rotor

b. outside the glass envelope and outside the rotor

The exposure switch on an x-ray machine is intended to

a. initiate the exposure.

b. terminate the exposure.

c. both initiate and terminate the exposure.

d. rotate the anode up to speed.

a. initiate the exposure.

The exposure switch is found between the

a. incoming line and the circuit breaker.

b. autotransformer and the timer circuit.

c. exposure switch and the step-up transformer.

d. incoming line and the step-down transformer.

b. autotransformer and the timer circuit.

The electrical device used to adjust the mA selection is a/an

a. autotransformer.

b. stator.

c. diode.

d. variable resistor.

d. variable resistor.

In the x-ray circuit, the timing control is found between the

a. incoming line and the exposure switch.

b. autotransformer and the timer circuit.

c. exposure switch and the step-up transformer.

d. incoming line and the step-down transformer.

c. exposure switch and the step-up transformer.

In the x-ray circuit, the mA control is found between the

a. incoming line and the exposure switch.

b. autotransformer and the timer circuit.

c. exposure switch and the step-up transformer.

d. incoming line and the step-down transformer.

d. incoming line and the step-down transformer.

In the x-ray circuit, kVp control is found between the

a. incoming line and the exposure switch.

b. autotransformer and the timer circuit.

c. exposure switch and the step-up transformer.

d. incoming line and the step-down transformer.

a. incoming line and the exposure switch.

All of the following are radiographer-operated controls EXCEPT

a. kVp selection.

b. timer selection.

c. rotor speed.

d. mA selection.

c. rotor speed.

The diagnostic x-ray range of exposure is approximately

a. 10 to 1,200 mA.

b. 0.001 to 10 seconds.

c. 25 to 150 kVp.

d. all of the above.

d. all of the above.

The time interval for an AEC detector to sense the presence of radiation and terminate the exposure is referred to as

a. minimum reaction time

b. pulse sequence

c. pulse interval

d. backup time

a. minimum reaction time

With modern x-ray systems, the incoming line current is supplied

a. in the form of a three-phase power cycle.

b. in the form of a single-phase power cycle.

c. as a direct current.

d. at approximately 60 volts.

a. in the form of a three-phase power cycle.

Nearly all types of x-ray equipment operate from an incoming line of

a. 210 V.

b. 120 AC.

c. 120 Hz.

d. 210 A.

a. 210 V.

When full-wave rectification is applied to three-phase current, a ____ ripple is produced.

a. current

b. star

c. voltage

d. double

c. voltage

A three-phase, rectified current produces a voltage ripple of ____ pulses per Hz.

a. 3

b. 6

c. 9

d. 24

b. 6

High-frequency generators

a. use invertors to increase pulse frequency.

b. produce similar output to three-phase with a single-phase source.

c. achieve peak kVp faster than single- or three-phase generators.

d. all of the above.

d. all of the above.

Falling load generators

a. permit higher mA exposures for short exposure times.

b. permit the mA to fall as exposure time increases.

c. are designed to use the highest allowable mA.

d. all of the above.

d. all of the above.

Automatic exposure control (AEC) technology determines

a. patient thickness.

b. exposure time.

c. kVp.

d. mA.

b. exposure time.

Present-day AEC technology utilizes

a. ionization chamber technology.

b. minimum reaction times as short as 1 ms.

c. a pre-detector AEC chamber position.

d. all of the above.

d. all of the above.

When compared to single-phase electrical current, three-phase power

a. permits shorter exposures.

b. produces 360 pulses per second.

c. produces less voltage ripple.

d. all of the above.

d. all of the above.

located between incoming line and exposure switch; determines kVp

autotransformer