Physics Chapter 6 pdf

1. The three main parts of the x-ray imaging system are the x-ray tube, ____________, and ____________.

a. protective barrier; tabletop

b. operating console; high voltage generator

c. rectification circuit; operating console

d. crane assembly; tabletop

1. The three main parts of the x-ray imaging system are the x-ray tube, ____________, and ____________.

a. protective barrier; tabletop

b. operating console; high voltage generator

c. rectification circuit; operating console

d. crane assembly; tabletop

b. operating console; high voltage generator

The three main parts of the x-ray imaging system are the x-ray tube, operating console, and high voltage generator.

2. The operating console contains circuits that are ________________.

a. both high voltage and low voltage

b. high voltage only

c. low voltage only

d. non-voltage

c. low voltage only

The operating console contains circuits that are low voltage only.

3. Variations in power distribution to the x-ray machine are corrected by the ____________.

a. line voltage compensator

b. high voltage autotransformer

c. full-wave rectifier

d. automatic exposure control

a. line voltage compensator

Variations in power distribution to the x-ray machine are corrected by the line voltage compensator.

4. The first component to receive power in the x-ray circuit is the ______________.

a. mA meter

b. high voltage transformer

c. rectifier

d. autotransformer

d. autotransformer

The first component in the x-ray circuit is the autotransformer

5. The autotransformer has _____ winding(s).

a. one

b. two

c. three

d. four

a. one

The autotransformer has one winding.

6. The _________ circuit provides electrons for the x-ray tube current.

a. rectifier

b. autotransformer

c. high voltage

d. filament

d. filament

The filament circuit provides electrons for the x-ray tube current.

7. Thermionic emission at the filament determines the __________ across the x-ray tube during an exposure.

a. kilovoltage

b. milliamperage

c. resistance

d. magnetism

b. milliamperage

Thermionic emission at the filament determines the milliamperage across the x-ray tube during an exposure.

8. A step-down transformer is located in the _______ circuit.

a. tube

b. timing

c. filament

d. rectifier

c. filament

A step-down transformer is located in the filament circuit.

9. The most accurate type of timer is the ________ timer.

a. mechanical

b. electronic

c. synchronous

d. mAs

b. electronic

The most accurate type of timer is the electronic timer.

10. The automatic exposure control (AEC) terminates the exposure when ________________.

a. the set time is reached

b. set radiation leaves the x-ray tube

c. sufficient radiation reaches the image receptor

d. the correct mAs is reached

c. sufficient radiation reaches the image receptor

The automatic exposure control (AEC) terminates the exposure when sufficient radiation reaches the image receptor

11. The mAs timer is usually set to give the __________ mA at the _________ time.

a. highest; highest

b. highest; shortest

c. lowest; shortest

d. lowest; highest

b. highest; shortest

The mAs timer is usually set to give the highest mA at the shortest time.

12. The step-up transformer increases voltage _________ times.

a. 500 to 1000

b. 200 to 300

c. 60 to 120

d. 20 to 50

a. 500 to 1000

The step-up transformer increases voltage 500 to 1000 times.

13. A diode allows electrons to flow from ___________.

a. anode to cathode

b. cathode to anode

c. cathode to cathode

d. anode to anode

b. cathode to anode

A diode allows electrons to flow from cathode to anode.

14. The high voltage generator contains the high voltage transformer, the __________, and the ___________.

a. autotransformer; timer

b. timer; rectifiers

c. kVp meter; filament transformer

d. filament transformer; rectifiers

b. timer; rectifiers

The high voltage generator contains the high voltage transformer, the filament transformer, and the rectifiers.

15. The difference in the waveform between the primary and secondary sides of the high voltage transformer is _________.

a. frequency

b. velocity

c. amplitude

d. potential difference

c. amplitude

The difference in the waveform between the primary and secondary sides of the high voltage transformer is amplitude.

16. In modern imaging systems, the components for rectification are ____________.

a. capacitor discharge generators

b. high frequency transformers

c. vacuum tubes

d. solid state semiconductors

d. solid state semiconductors

In modern imaging systems, the components for rectification are solid state semiconductors.

17. With half-wave rectification, the current flows through the x-ray tube during the ________ part of the cycle.

a. zero

b. positive or negative

c. positive

d. negative

c. positive

With half-wave rectification, the current flows through the x-ray tube during the positive part of the cycle.

18. Full-wave rectified, three-phase units provide an x-ray beam at _____ pulse(es) per second.

a. 1

b. 60

c. 120

d. 360

d. 360

Full-wave rectified, three-phase units provide an x-ray beam at 360 pulses per second.

19. Voltage across the x-ray tube is most constant with _________________.

a. high frequency generators

b. single-phase, half-wave rectification

c. single-phase, full-wave rectification

d. three-phase, full-wave rectification

a. high frequency generators

Voltage across the x-ray tube is most constant with high frequency generators.

20. Most mammography units operate with ___________ generators.

a. capacitor discharge

b. high frequency

c. single-phase

d. three-phase

b. high frequency

Most mammography units operate with high frequency generators.