LU06 Physics Quiz

Question 1

main purpose of x-ray tube

Answer 1

maintain a vacuum

Question 2

two types of anodes

Answer 2

stationary
rotating

Question 3

flaw of stationary anodes

Answer 3

hot electrons constantly bombarding the same
spot on anode

Question 4

what is used as the core for rotating anodes

Answer 4

molybdenum

Question 5

what is used on the external surface of our rotating anodes

Answer 5

rhenium and tungsten

Question 6

the motor that turns our anodes works through

Answer 6

mutual induction

Question 7

small anode angles results in

Answer 7

the smallest effective focal spot

Question 8

less intensity comes from what side
anode or cathode

Answer 8

anode

Question 9

what charge does the focusing cup have

Answer 9

negative

Question 10

the oil in the tube serves as

Answer 10

electric insulation

Question 11

another term for electron cloud

Answer 11

space charge

Question 12

tungsten button embedded in a copper rod

Answer 12

stationary anode

Question 13

what has a moly core

Answer 13

rotating anode

Question 14

what is the outside of the rotating anode coated with

Answer 14

tungsten and sometimes rhenium

Question 15

anode is composed of

Answer 15

anode target
induction motor

Question 16

cathode is composed of

Answer 16

focusing cup
filament
wires

Question 17

glass envelope is made of

Answer 17

borosilicate glass

Question 18

what does a metal envelope provide

Answer 18

provides a constant electric potential between the cathode and anode

Question 19

the window is typically

Answer 19

5 cm square

Question 20

the window is constructed to

Answer 20

minimally absorb x rays

Question 21

made up of electromagnetic that are arranged in pairs around the rotor

Answer 21

stator

Question 22

located outside of the tube enclosure

Answer 22

stator

Question 23

made up of an iron core

Answer 23

rotor

Question 24

located inside the tube enclosure

Answer 24

rotor

Question 25

rpm’s for general purpose tubes

Answer 25

3,400

Question 26

rpm for specialty tubes

Answer 26

10,000

Question 27

when the angle of the anode is less then 45 degrees…

Answer 27

the effective focal spot will be smaller than the actual

Question 28

what degree is the most common in general purpose tubes

Answer 28

12

Question 29

benefits of LFP

Answer 29

better heat dissipation higher quality images sharper images

Question 30

focusing cup is connected to

Answer 30

secondary circuit

Question 31

what is added to the filaments to increase thermionic emission and extend filament life

Answer 31

thorium

Question 32

focusing cup is made up of

Answer 32

nickel

Question 33

focusing cup works via

Answer 33

electrostatic repulsion

Question 34

three ways heat is dissipated

Answer 34

conduction radiation convection

Question 35

of best energy from the anode used to determine if a particular set of exposure factors are safe or unsafe for the x ray tube

Answer 35

tube rating charts

Question 36

gives the time it takes for a tube to cool down before proceeding with another exposure

Answer 36

tube cooling charts

Question 37

what three things are plotted on tube rating charts

Answer 37

kvp exposure time ma