Ch. 5

Question 0

What does mA control?

Answer 0

Filament current

Question 1

What does kVp control?

Answer 1

KVP level

Question 2

What is time selection?

Answer 2

Length of exposure

Question 3

What does the rotor switch control?

Answer 3

Speed of rotating anode

Question 4

What does the exposure switch control?

Answer 4

Moment of exposure

Question 5

Where is the kVp selection?

Answer 5

Autotransformer

Between incoming line & exposure switch

Question 6

Where is the mA selection?

Answer 6

Variable resistor
(In filament circuit between incoming line & step down transformer)

Question 7

Where is the time selection?

Answer 7

Timer circuit 
(Between exposure switch & step-up transformer)

Question 8

Where is the rotor switch?

Answer 8

Stator

Desperate circuit from stator of anode motor

Question 9

Where is the exposure switch?

Answer 9

Switch

Between auto transformer & timer circuit

Question 10

rms voltage=

Answer 10

rms voltage= 70.7% peak kVp

Question 11

What is diagnostic use?

Answer 11

Determines the source or cause of a disease

Question 12

What is Therapeutic use?

Answer 12

Treats & rehabilitates a disease

Radiation therapy

Question 13

What must the radiographic table be?

Answer 13

Radiolucent (carbon graphite fiber)

Question 14

How is tube support locked in place?

Answer 14

“Detents” locked in place by a solenoid

Question 15

U.S. Electricity is supplied by

Answer 15

60 Hz AC

Nominal rms voltage 200v-240v

Question 16

Single-phase allows what?

Answer 16

Allows potential difference to drop to 0

Question 17

What type of power is usually used for X-rays?

Answer 17

3-phase power

Question 18

Why is 3-phase better than single-phase?

Answer 18

3-phase has less ripple, produces better & more consistent x-rays

Question 19

Single-phase power has?

Answer 19

100% ripple

Voltage varies

Question 20

3-phase has?

Answer 20

14% ripple

Voltage never falls below 86

Question 21

3-phase, 12 pulse has?

Answer 21

4% ripple

Voltage never falls below 96

Question 22

High-frequency power has?

Answer 22

1% ripple

Voltage never falls below 99

Question 23

3-phase generator formula?

Answer 23

VxA=W

Question 24

1-phase Generator formula?

Answer 24

V x A x 0.7= W

Question 25

What do Falling-Load generators operate at?

Answer 25

Shortest time + highest mA

Question 26

What are the 2 main parts of the circuit?

Answer 26

Main Circuit & Filament Circuit

Question 27

What does the main circuit do?

Answer 27

Supplies power to X-ray tube so that X-rays are produced

Question 28

What does filament circuit do?

Answer 28

Supplies power to filament so that filament supplies enough electrons by thermionic emission

Question 29

What are the 3 parts if the main circuit?

Answer 29

• main switch
• exposure switch
• timer