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RT 205 > Ch. 5 > Flashcards

Ch. 5 Flashcards

0
Q

What does mA control?

A

Filament current

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1
Q

What does kVp control?

A

KVP level

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2
Q

What is time selection?

A

Length of exposure

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3
Q

What does the rotor switch control?

A

Speed of rotating anode

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4
Q

What does the exposure switch control?

A

Moment of exposure

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5
Q

Where is the kVp selection?

A

Autotransformer

Between incoming line & exposure switch

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6
Q

Where is the mA selection?

A 
Variable resistor
(In filament circuit between incoming line & step down transformer)
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7
Q

Where is the time selection?

A 
Timer circuit 
(Between exposure switch & step-up transformer)
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8
Q

Where is the rotor switch?

A

Stator

Desperate circuit from stator of anode motor

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9
Q

Where is the exposure switch?

A

Switch

Between auto transformer & timer circuit

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10
Q

rms voltage=

A

rms voltage= 70.7% peak kVp

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11
Q

What is diagnostic use?

A

Determines the source or cause of a disease

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12
Q

What is Therapeutic use?

A

Treats & rehabilitates a disease

Radiation therapy

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13
Q

What must the radiographic table be?

A

Radiolucent (carbon graphite fiber)

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14
Q

How is tube support locked in place?

A

“Detents” locked in place by a solenoid

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15
Q

U.S. Electricity is supplied by

A

60 Hz AC

Nominal rms voltage 200v-240v

16
Q

Single-phase allows what?

A

Allows potential difference to drop to 0

17
Q

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

A

3-phase power

18
Q

Why is 3-phase better than single-phase?

A

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

19
Q

Single-phase power has?

A

100% ripple

Voltage varies

20
Q

3-phase has?

A

14% ripple

Voltage never falls below 86

21
Q

3-phase, 12 pulse has?

A

4% ripple

Voltage never falls below 96

22
Q

High-frequency power has?

A

1% ripple

Voltage never falls below 99

23
Q

3-phase generator formula?

A

VxA=W

24
Q

1-phase Generator formula?

A

V x A x 0.7= W

25
Q

What do Falling-Load generators operate at?

A

Shortest time + highest mA

26
Q

What are the 2 main parts of the circuit?

A

Main Circuit & Filament Circuit

27
Q

What does the main circuit do?

A

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

28
Q

What does filament circuit do?

A

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

29
Q

What are the 3 parts if the main circuit?

A
  • main switch
  • exposure switch
  • timer

RT 205 (1 decks)

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