week 4 Phycs.DX.IM

Question 1

a moving charged particle creates a

Answer 1

magnetic field

Question 2

induced current is defined as

Answer 2

creating a relative movement between a conductor and a magnetic field

Question 3

result of induced current

Answer 3

movement of e- in the conductor, creating an induced electromotive force or current

Question 4

relative movement

Answer 4

comparing one object spatial relationship to another

Question 5

if you generate e- what is produced?

Answer 5

current

Question 6

static magnetic field means what?

Answer 6

it is a static/steady current

Question 7

what happens to the magnetic field with an AC current with each voltage cycle?

Answer 7

it will expand and collapse

Question 8

In induced velocity what has to move in order for the e- to move

Answer 8

magnetic field or the conductor

Question 9

turns ratio will change

Answer 9

the voltage and amperage between the 2 circuits

Question 10

induced current occurs in the

Answer 10

secondary coil

Question 11

transformers operate on the principle of

Answer 11

induced current

Question 12

Transformers use induced current principle to change

Answer 12

voltage and amperage of a circuit.

Question 13

turns ratio

Answer 13

number of turns (circles of wire) around the primary coil vs. number of turns around in the secondary coil

Question 14

voltage and amperage are_____ and _________ related across a transformer

Answer 14

1. inversely

2. proportionately

Question 15

as volts go up what happens to amperes?

Answer 15

amperes go down

Question 16

transformer allow you to change

Answer 16

amperes and voltage

Question 17

mechanical support of tube

Answer 17

tube stand

Question 18

Location of tube is

Answer 18

inside

Question 19

grid is what partion of xray?

Answer 19

what xray passes through

Question 20

cassette of xray contains

Answer 20

film

Question 21

collimator does what on the xray film

*

Answer 21

limits the size of the beam xraying a certain portion of body

Question 22

x-rays first pass through

Answer 22

mirror

Question 23

second stage of xray passes through what?

Answer 23

passes through the shutters

Question 24

________ and a ______ are also part of the collimator to project a pattern of visible light accurately demonstrating the area which will be irradiated

Answer 24

1. light source

2. mirror

Question 25

central ray is defined as a ?

Answer 25

imaginary photon right in the middle of the xray beam

Question 26

knife light tells us the what about the central ray?

Answer 26

level of the central ray

Question 27

3 key exposure variables

Answer 27

time tube current tube potential

Question 28

line compensation

Answer 28

correction of in out of voltage to machine

Question 29

most xrays are taken between

Answer 29

60 - 100 kev

Question 30

autotransformer is made of

Answer 30

one set of windings

Question 31

high voltage transformers change

Answer 31

Volts --> kilovolts

Question 32

x ray housing reduces

Answer 32

the spread of radiation throughout by limiting radiation emission from the tube

Question 33

x-rays leave the housing through a

Answer 33

port

Question 34

glass may become

Answer 34

electroplated

Question 35

the envelope is made up of

Answer 35

glass

Question 36

cathode is known as an

Answer 36

e- emitter

Question 37

what are the 2 parts of the cathode

Answer 37

filament and focusing cup

Question 38

focusing cup does what

Answer 38

focuses the e- to a single point

Question 39

thermionic emission

Answer 39

tungsten wire will emit e- when heated by passage of a low amperage current

Question 40

filament =

Answer 40

thoriated tungsten wire coil

Question 41

anode side is the electrode ethat is

Answer 41

positive side of tube

Question 42

greater the charge impacts force how?

Answer 42

greater the force of the e-

Question 43

rotor is the portion that

Answer 43

rotates and is made up of copper and molybdenum

Question 44

focal spot

Answer 44

limited area of target receives e- at any given spot

Question 45

larger filament =

Answer 45

larger focal spot

Question 46

smaller filament =

Answer 46

smaller focal spot

Question 47

the effective focal spot size is _____ than actual focal spot size

Answer 47

less

Question 48

actual size of focal spot is going to appear

Answer 48

smaller than it actually is

Question 49

actual focal spot size

Answer 49

area struck by e- at any given instance during exposure

Question 50

smaller focal size/smaller filament increases

Answer 50

resolution

Question 51

magnitude of induced current depends on

Answer 51

- Strength of magnetic field - Velocity magnetic field moving past conductor - Angle of conductor to magnetic field - Number of turns in the conductor

Question 52

in a transformer the primary coil is connected to what and creates what?

Answer 52

connected to an AC source creating an expanding and collapsing electromagnetic field.

Question 53

what happens in the primary coil vs secondary coil?

Answer 53

primary coil: creates a expanding/collapsing electromagnetic field. Secondary creates: induced current