Physics 3

Calculate the secondary voltage that will be induced based on 200 primary turns, 20,000 secondary turns and a primary voltage of 110 v.

11,000

Using an autotransformer, calculate the secondary voltage that will be induced if 440 volts are impressed on the primary side of an autotransformer with 880 total turns when 220 tapped turns are selected.

110 v

Full-wave rectified, three-phase units provide an x-ray beam at __________ pulses per second.

120

Using an autotransformer, calculate the secondary voltage that will be induced if 80 volts are impressed on the primary side of an autotransformer with 750 total turns when 125 tapped turns are selected.

13.3 v

Calculate the secondary voltage that will be induced based on 2,000 primary turns, 20,000 secondary turns and a primary voltage of 200 v.

2,000

A transformer has 100 primary and 400 secondary turns of wire. What secondary current (amperage) will be induced if 100 amps are placed on the primary coil (assuming no power losses occur)?

25

Using an autotransformer, calculate the secondary voltage that will be induced if 220 volts are impressed on the primary side of an autotransformer with 400 total turns when 50 tapped turns are selected.

26.5 v

The selection of voltage to the primary of the high-tension transformer in a three- phase unit is made by:

3 autotransformers

Calculate the secondary voltage that will be induced based on 30,000 primary turns, 300 secondary turns and a primary voltage of 380 v.

3.8

The high temperatures needed to produce the thermionic emission in the filament of an x-ray tube require a current of about: 4-6 amps 1-2 milliamps 3-6 milliamps 0.5 - 1 amp

4-6 amps

If 440 volts are impressed on the primary side of an autotransformer that consists of 110 total turns, what is the secondary voltage that will be induced if the 100th tapped turn is selected?

400 v

The step-up transformer increases voltage

500-1000 times

Using an autotransformer, calculate the secondary voltage that will be induced if 220 volts are impressed on the primary side of an autotransformer with 220 total turns when 55 tapped turns are selected.

55 v

Using an autotransformer, calculate the secondary voltage that will be induced if 200 volts are impressed on the primary side of an autotransformer with 450 total turns when 150 tapped turns are selected.

66.6 v

How many times does an AC current change direction (alternations) in a single minute?

7,200

A transformer has 100 primary and 400 secondary turns of wire. What secondary voltage will be induced if 200 volts are placed on the primary coil (assuming no power losses occur)?

800

For three-phase, six pulse x-ray machines, during an exposure the voltage never drops below _________

86%

The current to a transformer must be supplied by a(n) _____ source.

AC

The high-tension transformer of a modern x-ray circuit is most closely related to the: High potential required to accelerate the electrons across the tube. Production of the high amperage needed to develop the space charge. Maximum speed achieved by the rotating anode. Rate at which the x-ray photons are formed in the tube

High potential required to accelerate the electrons across the tube.

The current passing between the secondary of the high-tension transformer and the rectifiers is best described as a type of: High voltage (kV) AC Low voltage AC Low voltage DC High voltage (kV) DC

High voltage (kV) AC

A line voltage compensator is incorporated into the primary circuit of a digital radiographic unit to: Maintain a constant kVp level Compensate for variations of the timer Control the desired speed of the anode Provide the desired filament charge

Maintain a constant kVp level

The type of meter that is used to measure the current passing between the electrodes of an x-ray tube it the: Miliampere-seconds meter Synchronous ammeter Multiphase ohm meter Pre-reading kilovolt meter

Miliampere-seconds meter

The majority of components in a modern x-ray circuit are found in the primary tube circuit. This is done to: Reduce the rick from electrical shock Decrease the size of the transformer Reduce the size of the unit Decrease the size of the tube housing

Reduce the rick from electrical shock

The majority of components in a modern x-ray circuit are found in the primary circuit. This is done to: Reduce the risk from electrical shock Decrease the size of the transformer Decrease the size of the tube housing Reduce the size of the unit

Reduce the risk from electrical shock

The high-tension portion of a modern x-ray circuit does NOT contain which of the following components? The solid state diodes The filament selector The milliammeter The x-ray tube cables

The filament selector

Describe the process of mutual induction.

The process in which two coils are carrying different currents in them and their magnetic fields are also interacting with each other thus inducing emf for each other

In a three-phase, 12-pulse unit, rectification is accomplished by employing: Twelve solid state diodes Delta and wye windings Four thermionic diodes Six solid state diodes

Twelve solid state diodes

Variations in power distribution to the x-ray machine are corrected by the

line voltage compensator

Thermionic emission at the filament determines the ___________ across the x-ray tube during an exposure.

millamperage

The modern solid-state diode is constructed by connecting an _______-type crystal of silicon to a _______-type crystal.

n-type p-type

The charge carriers are considered to be a negative in a

n-type semiconductor

The autotransformer has _________ winding(s).

one

High frequency generators

produce x-rays with the most constant kVp

It is important that __________ be the last step in preparing high-voltage electricity to enter the x-ray tube.

rectification

The process by which alternating current is converted into pulsating direct current is termed: Depolarization Electrification Polarization Rectification

rectification

The purpose of grounding is to:

reduces the risk of electrocution and reduces the amount of insulation required on the cables

Production of the thermionic cloud requires

resistance

When a conductor has a smaller cross-sectional area:

resistance increases

The rectifiers are found on the:

secondary circuit

An x-ray machine with no rectifiers in its circuits is referred to as _______-rectified.

self

An autotransformer works on the principle of

self-induction

28. The two basic types of induction are

self-induction and mutual induction.

The most efficient type of transformer is the _________

shell type

The principle material that is used in the formation of a solid state diode is Gadolinium Lanthanum Silicon Tungsten

silicon

The x-ray generator with the lowest power rating is the _______ imaging system

single-phase

In a three-phase, six-pulse rectified unit, how many voltage peaks are produced for each cycle of incoming line voltage? Twelve peaks Six peaks Three peaks Nine peaks

six peaks

As more and more electrons build up in the area of the filament, their negative charges oppose the emission of additional electrons. This phenomenon is known as

space charge effect

The high amperage necessary to cause thermionic emission in the filament circuit is developed from the use of a ________________________________.

step-down transformer

The ___________converts volts to kilovolts.

step-up transformer

The rectification of high voltage alternating current into pulsating direct current occurs between the secondary of the high-tension transformer and the: Inverter circuit Solid state diodes X-ray tube Autotransformer

x-ray tube

Half wave rectification can be accomplished by using ___________ diodes.

0, 1, or 2

Calculate the secondary current that will be induced based on 120 primary turns, 12,000 secondary turns and a primary amperage of 80 A.

0.8

Which of the following components are likely to be found in the primary tube circuit of a modern x-ray unit? 1- Autotransformer 2- Timer switch 3- Anode of the x-ray tube

1 & 2 only

Which of the following current regulating devices are required in the production of the high-voltage direct current needed in the x-ray production process? 1- Rectifiers 2- High-tension transformer 3- Filament transformer

1 & 2 only

Calculate the secondary voltage that will be induced based on 10,000 primary turns, 100 secondary turns and a primary voltage of 110 v.

1.1

Using an autotransformer, calculate the secondary voltage that will be induced if 110 volts are impressed on the primary side of an autotransformer with 1000 total turns when 10 tapped turns are selected.

1.1 v

Calculate the secondary current that will be induced based on 100 primary turns, 10,000 secondary turns and a primary amperage of 1 kA.

10

Calculate the secondary current that will be induced based on 10,000 primary turns, 100 secondary turns and a primary amperage of 1 A.

100

Using an autotransformer, calculate the secondary voltage that will be induced if 800 volts are impressed on the primary side of an autotransformer with 880 total turns when 110 tapped turns are selected.

100 v

A single-phase waveform has

100% ripple

The voltage in the secondary circuit of a modern x-ray circuit is normally about _____________ than the voltage in the primary circuit. 1000 times higher 20 times lower 100 times higher 500 times lower

1000 times higher

X-ray photon production occurs at the

anode

The first component to receive power in the x-ray circuit is the

autotransformer

Three-phase power:

common method of alternating current electric power generation, transmission, and distribution.

When a negative charge is placed on the p-type crystal and a positive charge on the n-type crystal, the result is:

current does not flow through the diode

A step-down transformer results in

decreased current

A step-up transformer results in ____________ current and ____________voltage.

decreased current increased voltage

Which of the following devices allow the electricity to flow in one direction only?

diodes

The volt is the unit of measure for:

electrical potential

The n-type crystal from a solid-state rectifier has an abundance of:

electrons

A step-down transformer is located in the _________ circuit.

filament

The ________ circuit provides electrons for the x-ray tube current.

filament

The rheostat is found on the:

filament circuit

The frequency of electricity is expressed in the unit:

hertz

Voltage across the x-ray tube is most constant with

high frequency generators

A transformer converts

high to low voltages

The incoming line current is supplied

in the form of a three-phase power cycle

The mA control is found between the

incoming line and the step-down transformer

Place the electrical components in the order they occur in the filament circuit. mA selector step-down transformer incoming line voltage filament

incoming line voltage mA selector step-down transformer filament

Place the following events leading to the production of x-rays in order, from first to last: Filament is heated Electrons are boiled off filament Electricity leaves the autotransformer Electricity goes to primary side of step-down transformer

Electricity leaves the autotransformer Electricity goes to primary side of step-down transformer Filament is heated Electrons are boiled off filament

Place the events in the order they occur within the filament circuit thermionic emission increasing the amperage in the circuit adjusting the resistance in the circuit increasing the resistance in the circuit

adjusting the resistance in the circuit increasing the amperage in the circuit increasing the resistance in the circuit thermionic emission