Ch. 5 X-Ray Equipment

Question 1

How many alterations in the direction of the current flow occur in 0.10 second in a 60 Hz AC current?

Answer 1

12

0.1 sec x 120 turns/1sec

Question 2

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

Answer 2

Between the step-up transformer and the x-ray tube

Question 3

Where is the stator of the anode induction motor located?

Answer 3

Outside the glass envelope and outside the rotor

Question 4

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

Answer 4

Initiate the exposure

Question 5

The exposure switch is found between the:

Answer 5

Autotransformer and the timer circuit

Question 6

The electrical device used to adjust the mA selection is:

Answer 6

A variable resistor

Question 7

The time control is found between the:

Answer 7

• Exposure switch and the step-up transformer

- Incoming line and the step-down transformer

Question 8

The mA control is found between the:

Answer 8

Incoming line and the exposure switch

Question 9

Diagnostic x-ray range is approximately:

Answer 9

• 10 to 1200 mA
• 0.001 to 10 seconds
• 25 to 150 kVp

Question 10

A key advantage of a curved-top radiographic table is the:

Answer 10

Smaller object image distance (OID)

Question 11

When using AEC at 80 kVp, backup times:

Answer 11

Must not exceed 600 mAs

Question 12

Radiographic rooms equipped with a tilting table are primarily designed for performing _______ procedures.

Answer 12

Fluoroscopic

Question 13

All of the following are x-ray tube support systems EXCEPT:

a. C-arm
b. Floor-to-ceiling
c. Overhead suspension
d. Fluoroscopic tower

Answer 13

d. Fluoroscopic tower

Question 14

To protect the radiographer during x-ray exposures.

Answer 14

The mA and kVp selections are on the low voltage side of the circiut

Question 15

Which tube suspension system offers the greatest multidirectional movement?

a. Overhead tube suspension system
b. Floor-to ceiling tube suspension
c. Floor tube suspension system
d. Mobile tube suspension system

Answer 15

a. Overhead tube suspension system

Question 16

The incoming line current is supplied:

Answer 16

In the form of a three phase power cycle

Question 17

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

Answer 17

210 V

Question 18

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

Answer 18

Voltage

Question 19

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

Answer 19

6

Question 20

Ancillary equipment for tilting tables includes:

Answer 20

• A footboard
• Handgrips
• Shoulder supports

Question 21

All of the following are desired features of radiographic tables EXCEPT:

a. Variable height to improve patient safety
b. Floating table tops to enhance patient positioning
c. Low abrasion surface to lessen patient slippage as they transfer
d. Carbon fiber material to reduce absorption of x-ray energy

Answer 21

c. Low abrasion surface to lessen patient slippage as they transfer

Question 22

High frequency generators:

Answer 22

• Use invertors to increase pulse frequency
• Produce similar output to three-phase with a single phase source
• Achieve peak kVp faster than single or three phase generators

Question 23

Falling load generators:

Answer 23

• Permit higher mA exposures for short exposure times
• Permit the mA to fall as exposure time increases
• Are designed to use the highest allowable mA

Question 24

Radiographing a thin body part using automatic exposure control (AEC):

Answer 24

May produce inconsistent images due to AEC timer errors

Question 25

Automatic exposure control (AEC) technology determines:

Answer 25

Exposure time

Question 26

Present day AEC technology utilized:

Answer 26

• Ionization chamber technology
• Minimum reaction times as short as 1 ms
• A pre-detector AEC chamber position

Question 27

When compared to battery-powered portable radiographic units, capacitor discharge mobile units:

Answer 27

Have a tendency to produce leakage exposure after exposure termination

Question 28

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

Answer 28

• Permits shorter exposures
• Produces 360 pulses per second
• Produces less voltage ripple