High voltage Generator

Question 0

Used to change incoming power to levels needed to produce x-rays

Answer 0

High voltage section or generator

Question 1

Generator is connected to the power line through a

Answer 1

Circuit breaker

Question 2

Is used primarily for electrical insulation

Answer 2

Oil

Question 3

In a step-up transformer secondary voltage is ____ than the primary voltage

Answer 3

Higher

Question 4

Limits current from power line to generator

Answer 4

Circuit breaker

Question 5

Responsible for increasing the output voltage from the auto transformer to the kVp necessary for x ray production

Answer 5

High voltage section/generator

Question 6

High voltage generator operates only on what current

Answer 6

Alternating current

Question 7

Voltage waveform is ____

Answer 7

Sinusoidal

Question 8

The only difference bet. Primary and secondary waveform is their

Answer 8

Amplitude

Question 9

Primary voltage is measured in ___ and secondary voltage is measured in ____

Answer 9

Volts (V)

kilovolt peak (kVp)

Question 10

Primary current is measured in ___ while secondary current is measured in ___

Answer 10

Amperes (A)

milliamperes (mA)

Question 11

What are the 2 types of current

Answer 11

Direct current

Alternating current

Question 12

Derived from cell or battery and uni-directional

Answer 12

Direct current

Question 13

Current changes its direction after equal intervals of time

Answer 13

Alternating current

Question 14

The positive and negative terminals are FIXED

Answer 14

Direct current

Question 15

NO FIXED TERMINALS as the current changes its direction after every half cycle

Answer 15

Alternating current

Question 16

X-ray tube must be provided with ___ current

Answer 16

Direct current

Question 17

X-ray are produced by acceleration of ___ from ____ to _____

Answer 17

Electrons

Cathode to anode

Question 18

Secondary voltage of high voltage transformer must be ___

Answer 18

Rectified

Question 19

Is a process whereby alternating current AC is converted into direct current DC

Answer 19

Rectification

Question 20

Required to ensure the electron flow in one direction “from cathode-anode”

Answer 20

Rectification

Question 21

Is an electronic device that allows current flow in only one direction

Answer 21

Rectifier

Question 22

A device which performs the opposite function ( changes DC to AC) is known as ___

Answer 22

Inverter

Question 23

Rectification is accomplished with ___

Answer 23

Diode

Question 24

A ___ is an electric device that contains 2 ____

Answer 24

Diode Electrodes

Question 25

An ___ is a conductor through which electric current is passed. It may be wires plates or rods

Answer 25

Electrode

Question 26

Solid state rectifier are made of ___ in most modern x ray generator

Answer 26

Silicon

Question 27

Have the ability to conduct electricty

Answer 27

Semiconductors

Question 28

2 types of semi conductor

Answer 28

n-type | p-type

Question 29

Have loosely bound electron that are relatively free to move

Answer 29

n-type

Question 30

Have space (holes) where there are no electrons

Answer 30

p-type

Question 31

Middle portion or where the p and n type meet

Answer 31

Depletion region

Question 32

The current that passes through the x ray tube exist only during the positive half of the cycle

Answer 32

Unrectified voltage

Question 33

That is when the anode is positive and cathode is negative

Answer 33

Unrectified voltage

Question 34

During the negative half cycle current flow only from

Answer 34

Anode to cathode

Question 35

2 types of rectification

Answer 35

Half-wave rectification | Full-wave rectification

Question 36

Is the simplest type of rectifier since it only uses one diode

Answer 36

Half-wave rectifier

Question 37

Problems in half wave rectification

Answer 37

It wastes half of the electric power supply It requires twice the exposure time

Question 38

Consists of at least 4 diodes in high voltage circuit

Answer 38

Full wave rectification

Question 39

For rectifiers arranged this way are called ___

Answer 39

Bridge rectifier

Question 40

Advantages of

Answer 40

The exposure time for given technique is cut in half The half wave rectified x ray tube emits only half of the time The pulsed x-ray output of a full wave rectified machine occurs 120 times each second instead of 60 times per second as with half wave rectification

Question 41

Another way to characterized the voltage waveform

Answer 41

Voltage ripple

Question 42

Voltage ripple usually expressed as percentage of maximum ___

Answer 42

kV

Question 43

Less voltage ripple results in a ___ radiation quantity and quality

Answer 43

Greater

Question 44

3 common characteristic of electrical waveforms

Answer 44

Period Frequency Amplitude

Question 45

Is the number of times the waveform repeats itself with in a one second time period

Answer 45

Frequency

Question 46

Is the magnitude or intensity of the signal waveform measured in volts or amps

Answer 46

Amplitude

Question 47

The length of time in seconds that the waveform makes to repeat itself from start to finish

Answer 47

Period

Question 48

Period is also called as ___ the waveform from sine waves or the ____ for square waves

Answer 48

Periodic Time Pulse Width

Question 49

Unit of frequency

Answer 49

Hertz (Hz)

Question 50

Single phase power results in a ____

Answer 50

Pulsating x ray beam

Question 51

This is causes by alternating in swing in voltage from 0 to maximum potential 120 times each second under full wave rectification

Answer 51

SPP= Single Phase Power

Question 52

Single phase input power results in ____

Answer 52

Pulsed radiation

Question 53

X rays with SPP has a value of near zero are of little value because of lower energy

Answer 53

X ray with little penetrability

Question 54

In ___ multiple voltage waveform are superimposed on one another resulting in a waveform that maintains a nearly constant high voltage

Answer 54

Three Phase Power

Question 55

With ___ the voltage impressed across the X ray beam tube is nearly constant never dropping to zero during exposure

Answer 55

TPP

Question 56

This produces a near constant potential voltage waveform improving image quality at lower radiation dose

Answer 56

High frequency generator

Question 57

Power rating for three phase and high frequency Power is measured in ___

Answer 57

kilowatts (kW)

Question 58

Formula for power rating in TPP

Answer 58

PR= mA x kVp/ 1000

Question 59

Formula for SPP

Answer 59

PR = (0.707) mA x kVp / 1000