major's bio ch TWO

a paramagnetic material is a material that is

weakly attracted to a magnetic field

the timer circuit is found on the

primary circuit

the selection of the large or small filament in the cathode depends on the choice of focal spot size at the operating console and the

mA station selected

the force of magnetic attraction varies

inversely with the square of the distance b/t the poles

in a solid conductor, wotf atomic elements can freely move

electrons

the purpose of grounding is to

neutralize a charged object

a device that converts mechanical energy to electrical energy is a

generator

wotf is true regarding the autotransformer

it uses self induction

as two charges get closer, the electrostatic force

is inversely proportional to the square of the distance b/t them

A material that will conduct electricity, not as well as good conductors, and will also provide slight insulation is called a(n)

semiconductor

a closed pathway of wires and related elements is called a(n)

electric circuit

The filaments within the x-ray tube are found on the

filament circuit

to get electrons to flow along a conductor, there must be

An excess of positive charges at one end of the wire, and an excess of negative charges at the other

rubber is

an excellent insulator

a step-down transformer results in

increased current

The filament is a straight piece of wire in the cathode T/F

false

All of the following x-ray circuit devices are located between the incoming power supply and the primary coil of the high-voltage transformer except

the milliamperage meter

Which of the following is NOT a good insulator?

gold

Electric charges are found only on the outside of the conductor T/F

true

Place the following events leading to production of x-rays in order, from first to last:

1. Electrons are boiled off the filament

2. Electricity leaves the autotransformer

3. Electricity goes to primary side of step-down transformer

4. filament is heated

2,3,4,1

A transformer with 100 times more turns on the secondary side as compared with the primary

is a step-up transformer

What must be adjusted to change the temperature of the filament?

rheostat

The secondary side of the high voltage transformer is found on the

secondary circuit

Determining the filament will be used during an exposure is done at the operating console by the selections of

small or large focal spot

Electricity is typically thought to be the same as

electrodynamics

Single-phase full-wave rectified current has

100% ripple

glass in an example of an

insulator

Inside the magnet, the lines of flux travel from

south pole to north pole

Place the following events leading to the production of x-rays in order, from first to last

1. alternating current converted to direct current
2. Voltage is adjusted at the autotransformer
3. Kilovoltage leaves the step-up transformer
4. Voltage goes to primary side of step-up transformer

2,4,3,1

the primary side of the high voltage transformer is found on the

primary circuit

the least amount of ripple is the result of

high frequency generators

the flow of electrons along a conductor is

electric circuit

a step up transformer results in

decrease current

water is a good conductor t/f

true

magnetic field strength is measured in

tesla

rubbing a rubber rod with fur is an example of electrification by

friction

the ampere is the unit of measure for

electric current

the primary purpse of the step down transformer is to

increase the amperage going to the filament

a device that convert electrical energy to mechanical energy is a

motor

when the radiographer selects kilovoltage on the control panel, which device is adjusted

autotransformer

a material that is weakly repelled by a magnetic field is classified as

diamagnetic

Place the following events leading to the production of x-rays in order, from first to last:

1. kilovoltage is rectified
2. voltage is adjusted at the autotransformer
3. anode and cathode develop large positive and negative charges

4. Voltage changes to kilovoltage

2,4,1,3

a material that is strongly attrached to a magnetic field is

ferromagnetic

outside the magnet, the lines of flux travel from

north pole to south pole

a material that resists the movement of electrons is an

insulator

ripple refers to

The fluctuation in voltage in the electricity

electrification by induction requires that the two objects

are not at all in contact with each other

When there is movement of some of the electrons of an uncharged metallic object as it is brought into the electric field of a charged object, this is electrification by

induction

Which of the following is/are components of the secondary, or high voltage, side of the x-ray circuit?

I. Rectification system

II. Autotransformer
III. kV meter

1 only

like poles of a magnet each other and the opposite poles _ each other

repel; attractt

the main power which is found on the

primary circuit

the _ converts volts to kilovolts

step up transformer

Which of the following is NOT a correct law of electrostatic

Electric charges reside only on the internal surface of conductors

four rectifiers will produce

full wave rectified current

Which of the following is NOT a good electrical conductor

glass (its a good insulator)

A step down transformer results in

decreased voltage

adjusting the rheostat changes _ the in the _circuit

resistance; filament

Place the following events leading to the production of x-rays in order, from first to last:

1. resistance is adjusted at the rheostat

2. filament is heated
3. filament current is increased
4. electrons are boiled off filament

1,3,2,4

Circuit devices that permit electrons to flow in only one direction are

solid state diodes

The number of turns on the primary and secondary sides of the step-down transformer can be adjusted to control the current filaments T/F

false

the study of electric charges in motion is

electrodynamics

the autotransformer is found on the

primary circuit

When a switch is turned on, the electric circuit

is closed

A transformer with 100 turns on the primary side and 50 turns on the secondary

is a step down transformer

A device that temporarily stores charge is the

capacitor

the volt is the unit of measure for

electric potential

the lines of force in space associated with a magnet are called

lines of flux

the rheostat is found of the

filament current

What is the turns ratio for a transformer that has 100 coils on the primary side and 500 coils on the secondary side?

5:1

The ability of a material to attract iron, cobalt, or nickel is called

magnetism

the rectifiers are found on the

secondary circuit

wotf devices allow the electricity to flow in one direction only

diode

the step down transformer is found on the

filament circuit

Which of the following occurs first in the sequence of events leading to x-ray production?

voltages becomes kilovoltage

ohms law can be written as

I = V/R

Which of the following devices is used to control voltage by varying resistance?

rheostat

when a conductor is longer

resistance increases

when a conductor has a smaller cross-sectional area:

resistance increases

The line compensator is typically wired to the

autotransformer

A material that allows electrons to move is a(n)

conductor

wood and plastic are considered

nonmagnetic

the only adjustable transformer in the x-ray circuit is the

autotransformer

the ability to do work because of a separation of charges is

electric potential

the devices that change alternating to direct current are the

rectifiers

the property of a circuit that impedes the flow of is

resistance

the devices that regulate the amount of current flowing in the circuit is the

resistor

the device that regulates the amount of current flowing in the circuit is the

resistor

the device referred to as the kvp selector is the

autotransformer

the devices that adjust the incoming power supplied to the x-ray circuit to maintain 220V is the

line compensator

the purpose of the filament circuit is to what

boil electrons off the filament

to produce xrays, cloud of electrons are necessary and the cathode must have a strong positive charge. t/f

false