Rad Phys Ch 10

Front 1

The high voltage that is required by an x-ray machine is produced by the ____________.

Back 1

transformer

Front 2

A transformer works on the principle of ____________.

Back 2

mutual induction

Front 3

The primary coil is the ________ side of the transformer.

Back 3

input

Front 4

The secondary coil is the ____________ side of the transformer.

Back 4

output

Front 5

The transformer law states that the emf induced in the secondary coil is to the emf in the primary coil, as the _____________ in the secondary coil is the ____________ in the primary coil.

Back 5

number of turns

Front 6

A ______________ transformer has more turns in the secondary coil than in the primary coil, and therefore _____________ is created in the secondary coil than is supplied to the primary coil.

Back 6

step up; higher voltage

Front 7

A ___________ transformer has fewer turns in the secondary coil than in the primary coil and therefore _________ is created in the secondary coil than was supplied to the primary coil.

Back 7

step down; less voltage

Front 8

According to the law of conservation of energy, there can be no more ________ coming out of the transformer than was put in.

Back 8

energy

Front 9

A step up transformer increases ___________ and decreases ______________.

Back 9

voltages; amperage

Front 10

A step down transformer decreases ________ and increase ___________.

Back 10

voltage; amperage

Front 11

In a diagnostic x-ray machine, the transformer provides the_____________ necessary for the electrons to be driven towards the anode with enough speed to create an x-ray photons.

Back 11

high potential difference.

Front 12

The step up transformer of an x-ray machine changes voltage into ____________.

Back 12

kV

Front 13

The step up transformer of an x-ray machine changes amperage into _________.

Back 13

mA

Front 14

The leakage of magnetic flux in the air at the ends of the cores of a transformer is known as _____________.

Back 14

flux leakage

Front 15

The ratio of power output to power input of a transformer is known as ___________.

Back 15

efficiency

Front 16

The loss of electrical power due to the resistance of the resistance of the coils of a transformer is known as __________.

Back 16

copper loss

Front 17

In a step up transformer, the primary winding carries a larger current so the wire must be ________ as compared to the secondary coil which carries a smaller current and therefore the wire may be ___________.

Back 17

thicker; smaller

Front 18

The swirling current created in the core which is induced by the magnetic flux is called an __________.

Back 18

eddy current

Front 19

The power loss of a transformer due to the energy necessary to overcome the opposition to change, exhibited by ferromagnetic materials, every time the magnetic field produced by the primary winding changes polarity is known as ____________.

Back 19

hysteresis

Front 20

The ___________ varies input voltage to the transformer in order to control output voltage and therefore functions as the kV selector of an x-ray machine.

Back 20

autotransformer

Front 21

The autotransformer is connected between the ____________ and the __________ side of the the transformer.

Back 21

incoming power source; primary coil

Front 22

The autotransformer operated on the principle of _________.

Back 22

self induction

Front 23

The secondary voltage of the autotransformer is applied to the ________ side of the main step up transformer.

Back 23

primary

Front 24

The _________ circuit of the x-ray tube carries the current needed to heat the filament.

Back 24

filament

Front 25

The _________ circuit of the x-ray tube carries the current passing between the cathode and anode.

Back 25

tube or main

Front 26

A ________ is a coil with a core whose position is able to be adjusted, which operates on the principle of self induction and was once used to regulate filament current in the x-ray tube.

Back 26

Choke Coil

Front 27

A ________ is a variable resistor designed to regulate filament current

Back 27

rhetostat

Front 28

Two coils wound around a square iron core.

Back 28

closed core transformer

Front 29

A single winding that serves as both the primary and secondary coil, with an adjustable number of windings on the secondary side.

Back 29

autotransformer

Front 30

Two insulated coils of wire with an iron core side by side.

Back 30

open core transformer

Front 31

Primary and secondary coils wound around the central section of a core consisting of sheets of silicon steel with two rectangular cutouts.

Back 31

shell type transformer

Front 32

Two insulated coils of wire side by side.

Back 32

air core transformer

Front 33

Which type of transformers have most flux leakage?

Back 33

open and air core transformers

Front 34

Which type of transformer is most commonly used in x-ray equipment?

Back 34

closed core transformer

Front 35

Is a transformer considered to be efficient?

Back 35

yes

Front 36

How can copper loss be reduced?

Back 36

by giving the side with the greater current a thicker wire

Front 37

How can eddy currents be reduced?

Back 37

it is reduced by laminated silicon steel core